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-<!-- $Id: install.sgml,v 1.14 1999-01-26 21:27:30 billf Exp $ -->
-<!-- The FreeBSD Documentation Project -->
-
- <sect>
- <heading>Installation<label id="install"></heading>
-
- <sect1>
- <heading>Which file do I download to get FreeBSD?</heading>
-
- <p>You generally need just one floppy image, the <em>floppies/boot.flp
- </em> file, which you image-copy onto a 1.44MB floppy and then boot from
- in order to download the rest (and the installation will manage your
- TCP/IP connection, deal with tapes, CDROMs, floppies, DOS
- partitions, whatever's necessary to get the rest of the bits
- installed).
-
- <p>If you need to download the distributions yourself (for a DOS
- filesystem install, for instance), below are some recommendations
- for distributions to grab:
-
- <itemize>
- <item> bin/<newline>
- <item> manpages/<newline>
- <item> compat*/<newline>
- <item> doc/ <newline>
- <item> src/ssys.* <newline>
- </itemize>
-
- <p>Full instructions on this procedure and a little bit more about
- installation issues in general can be found in the <url
- url="../handbook/install.html"
- name="Handbook entry on installing FreeBSD.">
-
- <sect1>
- <heading>Help! The boot floppy image will not fit on a single floppy!
- </heading>
- <p>A 3.5 inch (1.44MB) floppy can accomodate 1474560 bytes of data.
- The boot image is exactly 1474560 bytes in size.
- <p>Common mistakes when preparing the boot floppy are:
- <itemize>
- <item>Not downloading the floppy image in <tt>binary</tt> mode when
- using <tt>FTP</tt>.
- <p>Some FTP clients default their transfer mode to <tt>ascii</tt>
- and attempt to change any end-of-line characters received to match
- the conventions used by the client's system.
- This will almost invariably corrupt the boot image. Check the
- size of the downloaded boot image: if it is not <em>exactly</em>
- that on the server, then the download process is suspect.
- <p>To workaround: type <tt>binary</tt> at the FTP command prompt
- after getting connected to the server and before starting the
- download of the image.
- <item>Using the DOS <tt>copy</tt> command (or equivalent GUI tool) to
- transfer the boot image to floppy.
- <p>Programs like <tt>copy</tt> will not work as the boot
- image has been created to be booted into directly. The image has
- the complete content of the floppy, track for track, and is not
- meant to be placed on the floppy as a regular file.
- You have to transfer it to the floppy ``raw'', using the
- low-level tools (e.g. <tt>fdimage</tt> or <tt>rawrite</tt>)
- described in the <url url="../handbook/install.html"
- name="installation guide to FreeBSD">.
- </itemize>
-
- <sect1>
- <heading>Where are the instructions for installing FreeBSD?</heading>
-
- <p>Installation instructions can be found in the
- <url url="../handbook/install.html"
- name="Handbook entry on installing FreeBSD.">
-
- <sect1>
- <heading>What do I need in order to run FreeBSD?</heading>
-
- <p>You'll need a 386 or better PC, with 5 MB or more of RAM and at
- least 60 MB of hard disk space. It can run with a low end MDA
- graphics card but to run X11R6, a VGA or better video card is needed.
-
- <p>See also the section on <ref id="hardware"
- name="Hardware compatibility">
-
- <sect1>
- <heading>I have only 4 MB of RAM. Can I install FreeBSD?</heading>
-
- <p>FreeBSD 2.1.7 was the last version of FreeBSD that could be installed
- on a 4MB system. Newer versions of FreeBSD, like 2.2, need at least 5MB
- to install on a new system.
-
- <p>All versions of FreeBSD, including 3.0, will RUN in 4MB of ram, they
- just can't run the installation program in 4MB. You can add
- extra memory for the install process, if you like, and then
- after the system is up and running, go back to 4MB. Or you could
- always just swap your disk into a system which has >4MB, install onto
- it and then swap it back.
-
- <p>There are also situations in which FreeBSD 2.1.7 will not install
- in 4 MB. To be exact: it does not install with 640 kB base + 3 MB
- extended memory. If your motherboard can remap some of the ``lost''
- memory out of the 640kB to 1MB region, then you may still be able
- to get FreeBSD 2.1.7 up.
-
- <p>Try to go into your BIOS setup and look for a ``remap'' option.
- Enable it. You may also have to disable ROM shadowing.
-
- <p>It may be easier to get 4 more MB just for the install. Build a
- custom kernel with only the options you need and then get the 4
- MB out again.
-
- <p>You may also install 2.0.5 and then upgrade your system to 2.1.7
- with the ``upgrade'' option of the 2.1.7 installation program.
-
- <p>After the installation, if you build a custom kernel, it will run
- in 4 MB. Someone has even succeeded in booting with 2 MB (the
- system was almost unusable though :-))
-
- <sect1>
- <heading>
- How can I make my own custom install floppy?
- </heading>
-
- <p>Currently there's no way to *just* make a custom install floppy.
- You have to cut a whole new release, which will include your install
- floppy. There's some code in <tt>/usr/src/release/floppies/Makefile</tt>
- that's supposed to let you *just* make those floppies, but it's not
- really gelled yet.
-
- <p>To make a custom release, follow the instructions <ref id="custrel"
- name="here">.
-
- <sect1>
- <heading>Can I have more than one operating system on my PC?</heading>
-
- <p>Have a look at <url url="../tutorials/multios/multios.html"
- name="The multi-OS page.">
-
- <sect1>
- <heading>Can Windows 95 co-exist with FreeBSD?</heading>
-
- <p>Install Windows 95 first, after that FreeBSD. FreeBSD's boot
- manager will then manage to boot Win95 and FreeBSD. If you
- install Windows 95 second, it will boorishly overwrite your
- boot manager without even asking. If that happens, see
- the next section.
-
- <sect1>
- <heading>
- Windows 95 killed my boot manager! How do I get it back?
- </heading>
-
- <p>You can reinstall the boot manager FreeBSD comes with in one of
- two ways:
-
- <itemize>
- <item>Running DOS, go into the tools/ directory of your FreeBSD
- distribution and look for <bf>bootinst.exe</bf>. You run it like so:
-
- <p><bf>bootinst.exe boot.bin</bf>
-
- <p>and the boot manager will be reinstalled.
-
- <item>Boot the FreeBSD boot floppy again and go to the Custom
- installation menu item. Choose Partition. Select the drive which
- used to contain your boot manager (likely the first one) and when you
- come to the partition editor for it, as the very first thing (e.g.
- do not make any changes) select (W)rite. This will ask for
- confirmation, say yes, and when you get the Boot Manager selection
- prompt, be sure to select "Boot Manager."
- This will re-write the boot manager to disk. Now quit out of the
- installation menu and reboot off the hard disk as normal.
- </itemize>
-
- <sect1>
- <heading>Can I install on a disk with bad blocks?</heading>
-
- <p>FreeBSD's bad block (the <htmlurl
- url="http://www.freebsd.org/cgi/man.cgi?bad144" name="bad144">
- command) handling is still not 100&percnt; (to put it charitably) and
- it must unfortunately be said that if you've got an IDE or ESDI drive
- with lots of bad blocks, then FreeBSD is probably not for you!
- That said, it does work on thousands of IDE based systems, so
- you'd do well to try it first before simply giving up.
-
- <p>If you have a SCSI drive with bad blocks, see <ref id="awre"
- name="this answer">.
-
- <sect1>
- <heading>Strange things happen when I boot the install floppy!</heading>
-
- <p>If you're seeing things like the machine grinding to a halt or
- spontaneously rebooting when you try to boot the install floppy,
- here are three questions to ask yourself:-
-
- <enum>
- <item>Did you use a new, freshly-formatted, error-free floppy
- (preferably a brand-new one straight out of the box, as
- opposed to the magazine coverdisk that's been lying under
- the bed for the last three years)?
-
- <item>Did you download the floppy image in binary (or image) mode?
- (don't be embarrassed, even the best of us have accidentally
- downloaded a binary file in ASCII mode at least once!)
-
- <item>If you're using one of these new-fangled operating systems
- like Windows95 or Windows NT, did you shut it down and restart
- the system in plain, honest DOS? It seems these OS's can
- interfere with programs that write directly to hardware, which
- the disk creation program does; even running it inside a DOS
- shell in the GUI can cause this problem.
- </enum>
-
- <p>There have also been reports of Netscape causing problems when
- downloading the boot floppy, so it's probably best to use a different
- FTP client if you can.
-
- <sect1>
- <heading>Help! I can't install from tape!</heading>
-
- <p>If you are installing 2.1.7R from tape, you must create the tape
- using a tar blocksize of 10 (5120 bytes). The default tar
- blocksize is 20 (10240 bytes), and tapes created using this
- default size cannot be used to install 2.1.7R; with these tapes,
- you will get an error that complains about the record size being
- too big.
-
- <sect1>
- <heading>Connect two FreeBSD boxes over a parallel line (PLIP)
- </heading>
-
- <p>Get a laplink cable. Make sure both computer have a kernel
- with lpt driver support.
-
- <verb>
- $ dmesg | grep lp
- lpt0 at 0x378-0x37f irq 7 on isa
- lpt0: Interrupt-driven port
- lp0: TCP/IP capable interface
- </verb>
-
- <p>Plug in the laplink cable into the parallel interface.
-
- <p>Configure the network interface parameters for lp0 on both
- sites as root. For example, if you want connect the host max
- with moritz
-
- <verb>
- max <-----> moritz
-IP Address 10.0.0.1 10.0.0.2
- </verb>
-
- on max start
- <verb>
- # ifconfig lp0 10.0.0.1 10.0.0.2
- </verb>
-
-on moritz start
-
- <verb>
- # ifconfig lp0 10.0.0.2 10.0.0.1
- </verb>
-
- <P>Thats all! Please read also the manpages lp(4) and
- lpt(4).
-
- <P>You should also add the hosts to /etc/hosts
-
- <verb>
- 127.0.0.1 localhost.my.domain localhost
- 10.0.0.1 max.my.domain max
- 10.0.0.2 moritz.my.domain moritz
- </verb>
-
- <P>To check if it works do:
-
- on max:
-
-<verb>
-$ ifconfig lp0
-lp0: flags=8851<UP,POINTOPOINT,RUNNING,SIMPLEX,MULTICAST> mtu 1500
- inet 10.0.0.1 --> 10.0.0.2 netmask 0xff000000
-</verb>
-
-<verb>
-$ netstat -r
-Routing tables
-
-Internet:
-Destination Gateway Flags Refs Use Netif Expire
-moritz max UH 4 127592 lp0
-</verb>
-
-<verb>
-$ ping -c 4 moritz
-PING moritz (10.0.0.2): 56 data bytes
-64 bytes from 10.0.0.2: icmp_seq=0 ttl=255 time=2.774 ms
-64 bytes from 10.0.0.2: icmp_seq=1 ttl=255 time=2.530 ms
-64 bytes from 10.0.0.2: icmp_seq=2 ttl=255 time=2.556 ms
-64 bytes from 10.0.0.2: icmp_seq=3 ttl=255 time=2.714 ms
-
---- moritz ping statistics ---
-4 packets transmitted, 4 packets received, 0% packet loss
-round-trip min/avg/max/stddev = 2.530/2.643/2.774/0.103 ms
-</verb>
-
- <sect1>
- <heading>
- Can I install on my laptop over PLIP (Parallel Line IP)?
- </heading>
-
- <p>Connect the two computers using a Laplink parallel cable to use
- this feature:
-
- <verb>
- +----------------------------------------+
- |A-name A-End B-End Descr. Port/Bit |
- +----------------------------------------+
- |DATA0 2 15 Data 0/0x01 |
- |-ERROR 15 2 1/0x08 |
- +----------------------------------------+
- |DATA1 3 13 Data 0/0x02 |
- |+SLCT 13 3 1/0x10 |
- +----------------------------------------+
- |DATA2 4 12 Data 0/0x04 |
- |+PE 12 4 1/0x20 |
- +----------------------------------------+
- |DATA3 5 10 Strobe 0/0x08 |
- |-ACK 10 5 1/0x40 |
- +----------------------------------------+
- |DATA4 6 11 Data 0/0x10 |
- |BUSY 11 6 1/0x80 |
- +----------------------------------------+
- |GND 18-25 18-25 GND - |
- +----------------------------------------+
- </verb>
-
- <p>See also <ref id="pao" name="this note"> on the Mobile Computing page.
-
- <sect1>
- <heading>
- Which geometry should I use for a disk drive?<label id="geometry">
- </heading>
-
- <p>(By the "geometry" of a disk, we mean the number of cylinders,
- heads and sectors/track on a disk - I'll refer to this as
- C/H/S for convenience. This is how the PC's BIOS works out
- which area on a disk to read/write from).
-
- <p>This seems to cause a lot of confusion for some reason. First
- of all, the <tt /physical/ geometry of a SCSI drive is totally
- irrelevant, as FreeBSD works in term of disk blocks. In fact, there
- is no such thing as "the" physical geometry, as the sector density
- varies across the disk - what manufacturers claim is the "true"
- physical geometry is usually the geometry that they've worked out
- results in the least wasted space. For IDE disks, FreeBSD does
- work in terms of C/H/S, but all modern drives will convert this
- into block references internally as well.
-
- <p>All that matters is the <tt /logical/ geometry - the answer that the
- BIOS gets when it asks "what is your geometry?" and then uses to access
- the disk. As FreeBSD uses the BIOS when booting, it's very important
- to get this right. In particular, if you have more than one operating
- system on a disk, they must all agree on the geometry, otherwise you
- will have serious problems booting!
-
- <p>For SCSI disks, the geometry to use depends on whether extended
- translation support is turned on in your controller (this is
- often referred to as "support for DOS disks &gt;1GB" or something
- similar). If it's turned off, then use N cylinders, 64 heads
- and 32 sectors/track, where 'N' is the capacity of the disk in
- MB. For example, a 2GB disk should pretend to have 2048 cylinders,
- 64 heads and 32 sectors/track.
-
- <p>If it <tt /is/ turned on (it's often supplied this way to get around
- certain limitations in MSDOS) and the disk capacity is more than 1GB,
- use M cylinders, 63 sectors per track (*not* 64), and 255 heads, where
- 'M' is the disk capacity in MB divided by 7.844238 (!). So our
- example 2GB drive would have 261 cylinders, 63 sectors per track and
- 255 heads.
-
- <p>If you are not sure about this, or FreeBSD fails to detect the
- geometry correctly during installation, the simplest way around
- this is usually to create a small DOS partition on the disk. The
- correct geometry should then be detected (and you can always remove
- the DOS partition in the partition editor if you don't want to keep
- it, or leave it around for programming network cards and the like).
-
- <p>Alternatively, there is a freely available utility distributed with
- FreeBSD called ``<tt/pfdisk.exe/'' (located in the <tt>tools</tt>
- subdirectory on the FreeBSD CDROM or on the various FreeBSD
- ftp sites) which can be used to work out what geometry the other
- operating systems on the disk are using. You can then enter this
- geometry in the partition editor.
-
- <sect1>
- <heading>Any restrictions on how I divide the disk up?</heading>
-
- <p>Yes. You must make sure that your root partition is below 1024
- cylinders so the BIOS can boot the kernel from it. (Note that this
- is a limitation in the PC's BIOS, not FreeBSD).
-
- <p>For a SCSI drive, this will normally imply that the root partition
- will be in the first 1024MB (or in the first 4096MB if extended
- translation is turned on - see previous question). For IDE, the
- corresponding figure is 504MB.
-
- <sect1>
- <heading>
- What about disk managers? Or, I have a large drive!
- </heading>
-
- <p>FreeBSD recognizes the Ontrack Disk Manager and makes allowances
- for it. Other disk managers are not supported.
-
- <p>If you just want to use the disk with FreeBSD you don't need a
- disk manager. Just configure the disk for as much space as the
- BIOS can deal with (usually 504 megabytes), and FreeBSD
- should figure out how much space you really have. If you're using
- an old disk with an MFM controller, you may need to explicitly
- tell FreeBSD how many cylinders to use.
-
- <p>If you want to use the disk with FreeBSD and another operating
- system, you may be able to do without a disk manager: just make sure
- the the FreeBSD boot partition and the slice for the other
- operating system are in the first 1024 cylinders. If you're
- reasonably careful, a 20 megabyte boot partition should be plenty.
-
- <sect1>
- <heading>
- When I boot FreeBSD I get ``Missing Operating System''
- <label id="missing_os">
- </heading>
-
- <p>This is classically a case of FreeBSD and DOS or some other OS
- conflicting over their ideas of disk <ref id="geometry"
- name="geometry."> You will have to reinstall FreeBSD, but obeying the
- instructions given above will almost always get you going.
-
- <sect1>
- <heading>I can't get past the boot manager's `F?' prompt.</heading>
-
- <p>This is another symptom of the problem described in the preceding
- question. Your BIOS geometry and FreeBSD geometry settings do
- not agree! If your controller or BIOS supports cylinder
- translation (often marked as ``&gt;1GB drive support''), try
- toggling its setting and reinstalling FreeBSD.
-
- <sect1>
- <heading>
- I have &gt;16MB of RAM. Will this cause any problems?<label id="bigram">
- </heading>
-
- <p>Apart from performance issues, no. FreeBSD 2.X comes with bounce
- buffers which allow your bus mastering controller access to greater
- than 16MB. (Note that this should only be required if you are using
- ISA devices, although one or two broken EISA and VLB devices may
- need it as well).
-
- <p>Also look at the section on <ref id="reallybigram"
- name="&gt;64M machines"> if you have that much memory,
- or if you're using a Compaq or other BIOS that lies about
- the available memory.
-
- <sect1>
- <heading>Do I need to install the complete sources?</heading>
-
- <p>In general, no. However, we would strongly recommend that you
- install, at a minimum, the ``<tt/base/'' source kit, which
- includes several of the files mentioned here, and the
- ``<tt/sys/'' (kernel) source kit, which includes sources for the
- kernel. There is nothing in the system which requires the
- presence of the sources to operate, however, except for the
- kernel-configuration program
- <htmlurl url="http://www.freebsd.org/cgi/man.cgi?config"
- name="config">. With the exception
- of the kernel sources, our build structure is set up so that you
- can read-only mount the sources from elsewhere via NFS and still
- be able to make new binaries. (Because of the kernel-source
- restriction, we recommend that you not mount this on
- <tt>/usr/src</tt> directly, but rather in some other location
- with appropriate symbolic links to duplicate the top-level
- structure of the source tree.)
-
- <p>Having the sources on-line and knowing how to build a system with
- them will make it much easier for you to upgrade to future
- releases of FreeBSD.
-
- <p>To actually select a subset of the sources, use the Custom
- menu item when you are in the Distributions menu of the
- system installation tool. The <tt>src/install.sh</tt> script
- will also install partial pieces of the source distribution,
- depending on the arguments you pass it.
-
- <sect1>
- <heading>Do I need to build a kernel?</heading>
-
- <p>Building a new kernel was originally pretty much a required
- step in a FreeBSD installation, but more recent releases have
- benefited from the introduction of a much friendlier kernel
- configuration tool. When at the FreeBSD boot prompt (boot:),
- use the "-c" flag and you will be dropped into a visual
- configuration screen which allows you to configure the kernel's
- settings for most common ISA cards.
-
- <p>It's still recommended that you eventually build a new
- kernel containing just the drivers that you need, just to save a
- bit of RAM, but it's no longer a strict requirement for most
- systems.
-
- <sect1>
- <heading>I live outside the US. Can I use DES encryption?</heading>
-
- <p>If it is not absolutely imperative that you use DES style
- encryption, you can use FreeBSD's default encryption for even
- <bf/better/ security, and with no export restrictions. FreeBSD
- 2.0's password default scrambler is now <bf/MD5/-based, and is
- more CPU-intensive to crack with an automated password cracker
- than DES, and allows longer passwords as well. The only reason
- for not using the <bf/MD5/-based crypt today would be to use the
- the same password entries on FreeBSD and non-FreeBSD systems.
-
- <p>Since the DES encryption algorithm cannot legally be exported
- from the US, non-US users should not download this software (as
- part of the <tt/secrdist/ from US FTP sites.
-
- <p>There is however a replacement libcrypt available, based on
- sources written in Australia by David Burren. This code is now
- available on some non-US FreeBSD mirror sites. Sources for the
- unencumbered libcrypt, and binaries of the programs which use it,
- can be obtained from the following FTP sites:
-
- <descrip>
- <tag/South Africa/
- <tt>ftp://ftp.internat.freebsd.org/pub/FreeBSD</tt><newline>
- <tt>ftp://storm.sea.uct.ac.za/pub/FreeBSD</tt>
-
- <tag/Brazil/
- <tt>ftp://ftp.iqm.unicamp.br/pub/FreeBSD</tt>
-
- <tag/Finland/
- <tt>ftp://nic.funet.fi/pub/unix/FreeBSD/eurocrypt</tt>
- </descrip>
-
- <p>The non-US <tt/securedist/ can be used as a direct replacement
- for the encumbered US <tt/securedist/. This <tt/securedist/
- package is installed the same way as the US package (see
- installation notes for details). If you are going to install DES
- encryption, you should do so as soon as possible, before
- installing other software.
-
- <p>Non-US users should please not download any encryption software
- from the USA. This can get the maintainers of the sites from
- which the software is downloaded into severe legal difficulties.
-
- <p>A non-US distribution of Kerberos is also being developed, and
- current versions can generally be obtained by anonymous FTP from
- <tt>braae.ru.ac.za</tt>.
-
- <p>There is also a <ref id="mailing" name="mailing list"> for the
- discussion of non-US encryption software. For more information, send
- an email message with a single line saying ``<tt/help/'' in the body
- of your message to
-
- <tt>&lt;majordomo@braae.ru.ac.za&gt;</tt>.
-
- <sect1>
- <heading>The boot floppy starts but hangs at the ``Probing Devices...''
- screen.</heading>
-
- <p>If you have a IDE Zip or Jaz drive installed, remove it and try again.
- The boot floppy can get confused by the drives.
- After the system is installed you can reconnect the drive. Hopefully
- this will be fixed in a later release.
-
- <sect1>
- <heading>I get a ``panic: cant mount root'' error when rebooting the system after installation.</heading>
-
- <p>This error comes from confusion between the boot block's and the
- kernel's understanding of the disk devices. The error usually
- manifests on two-disk IDE systems, with the hard disks arranged as the
- master or single device on separate IDE controllers, with FreeBSD
- installed on the secondary IDE controller. The boot blocks think
- the system is installed on wd1 (the second BIOS disk) while the kernel
- assigns the first disk on the secondary controller device wd2. After
- the device probing, the kernel tries to mount what the boot blocks
- think is the boot disk, wd1, while it is really wd2, and fails.
-
- <p>To fix the problem, do one of the following:
-
- <enum>
- <item>At the Boot: prompt, enter
- <tt>1:wd(2,a)kernel</tt> and press Enter. If the system starts, then
- run the command
-<verb>
-echo "1:wd(2,a)kernel" > /boot.config
-</verb>
- to make it the default boot string.
- <item>Move the FreeBSD disk onto the primary IDE controller, so the
- hard disks are consecutive.
- <item><url url="../handbook/kernelconfig.html" name="Rebuild your kernel,">
- modify the wd configuration lines to read:
-
-<verb>
-controller wdc0 at isa? port "IO_WD1" bio irq 14 vector wdintr
-disk wd0 at wdc0 drive 0
-# disk wd1 at wdc0 drive 1 # comment out this line
-
-controller wdc1 at isa? port "IO_WD2" bio irq 15 vector wdintr
-disk wd1 at wdc1 drive 0 # change from wd2 to wd1
-disk wd2 at wdc1 drive 1 # change from wd3 to wd2
-</verb>
-
- Install the new kernel.
- If you moved your disks and wish to restore the previous
- configuration, replace the disks in the desired configuration and reboot.
- Your system should boot successfully.
-
- </enum>
-
- <sect1>
- <heading>What are the limits for memory?</heading>
-
- <p>For memory, the (theoretical) limit is 4 gigabytes. One gigabyte
- has been tested; you generally can't buy i386 PCs that can support
- much more than that.
-
- <sect1>
- <heading>What are the limits for ffs filesystems?</heading>
-
- <p>For ffs filesystems, the maximum theoretical limit is 8 terabytes
- (2G blocks), or 16TB for the default block size of 8K.
- In practice, there is a soft limit of 1 terabyte, but with modifications
- filesystems with 4 terabytes are possible (and exist).
-
- <p>The maximum size of a single ffs file is approximately 1G blocks
- (4TB) if the block size is 4K.
-
- <verb>
- maxfilesize
- ----------------------------------
- 2.2.7 3.0
-fs block size -stable -current works should-work
-------------- ------- -------- ----- -----------
-4K 4T-1 4T-1 4T-1 4+T
-8K 32+G 8T-1 32+G 16T-1
-16K 128+G 16T-1 128+G 32T-1
-32K 512+G 32T-1 512+G 64T-1
-64K 2048+G 64T-1 2048+G 128T-1
- </verb>
-
- <p>When the fs block size is 4K, triple indirect blocks work and
- everything should be limited by the maximum fs block number that can
- be represented using triple indirect blocks (approx. 1K^3 + 1K^2 +
- 1K), but everything is limited by a (wrong) limit of 1G-1 on fs block
- numbers. The limit on fs block numbers should be 2G-1. There are
- some bugs for fs block numbers near 2G-1, but such block numbers are
- unreachable when the fs block size is 4K.
-
- <p>For block sizes of 8K and larger, everything should be limited
- by the 2G-1 limit on fs block numbers, but is actually limited by the
- 1G-1 limit on fs block numbers, except under -stable triple indirect
- blocks are unreachable, so the limit is the maxiumum fs block number
- that can be represented using double indirect blocks
- (approx. (blocksize/4)^2 + (blocksize/4)), and under -current
- exceeding this limit may cause problems. Using the correct limit of
- 2G-1 blocks does cause problems.
-
- <sect1>
- <heading>How can I put 1TB files on my floppy?</heading>
-
- <p>I keep several virtual ones on floppies :-). The maxiumum
- file size is not closely related to the maximum disk size. The
- maximum disk size is 1TB. It is a feature that the file size can be
- larger than the disk size.
-
- <p>The following example creates a file of size 8T-1 using a
- whole 32K of disk space (3 indirect blocks and 1 data block) on a
- small root partition. The dd command requires a dd that works with
- large files.
-
-<verb>
-ttyv0:bde@alphplex:/tmp/q> cat foo
-df .
-dd if=/dev/zero of=z bs=1 seek=`echo 2^43 - 2 | bc` count=1
-ls -l z
-du z
-df .
-ttyv0:bde@alphplex:/tmp/q> sh foo
-Filesystem 1024-blocks Used Avail Capacity Mounted on
-/dev/sd0a 64479 27702 31619 47% /
-1+0 records in
-1+0 records out
-1 bytes transferred in 0.000187 secs (5346 bytes/sec)
--rw-r--r-- 1 bde bin 8796093022207 Sep 7 16:04 z
-32 z
-Filesystem 1024-blocks Used Avail Capacity Mounted on
-/dev/sd0a 64479 27734 31587 47% /
-ttyv0:bde@alphplex:/tmp/q> exit
-</verb>
-
-<p>Bruce Evans, September 1998
- </sect>
-