UFS2 filesystem and filesize limits
Kenneth D. Merry
ken at freebsd.org
Fri Jul 2 12:26:21 PDT 2004
On Fri, Jul 02, 2004 at 10:37:59 -0600, Kenneth D. Merry wrote:
>
> I've searched a bit on the list archives, but didn't find an obvious answer
> so I thought I'd ask:
>
> What is the maximum possible size of a UFS2 filesystem? Are there any
> gotchas associated with going that large?
>
> What is the maximum possible file size on a UFS2 filesystem?
Evidently there are some limits. I can create a 11TB filesystem, but I can
only put 714GB or so on it:
# dd if=/dev/zero of=bigfile bs=1m
/bigdisk: write failed, filesystem is full
dd: bigfile: No space left on device
730368+0 records in
730367+0 records out
765845307392 bytes transferred in 11211.369691 secs (68309701 bytes/sec)
# ls
.snap/ bigfile
# ls -la
total 748261206
drwxr-xr-x 3 root wheel 512 Jul 2 10:02 ./
drwxr-xr-x 21 root wheel 512 Jul 2 09:43 ../
drwxrwxr-x 2 root operator 512 Jul 2 09:39 .snap/
-rw------- 1 root wheel 765845307392 Jul 2 13:09 bigfile
# dd if=/dev/zero of=bigfile.2 bs=1m
/bigdisk: write failed, filesystem is full
dd: bigfile.2: No space left on device
257+0 records in
256+0 records out
268435456 bytes transferred in 3.409144 secs (78739843 bytes/sec)
# df
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/da0s1a 507630 186246 280774 40% /
devfs 1 1 0 100% /dev
/dev/da0s1e 31515362 1301220 27692914 4% /usr
/dev/da0s1d 507630 3470 463550 1% /var
/dev/ccd0 11349755298 748523524 9693251352 7% /bigdisk
# dd if=/dev/zero of=bigfile.3 bs=1m
/bigdisk: write failed, filesystem is full
dd: bigfile.3: No space left on device
33+0 records in
32+0 records out
33554432 bytes transferred in 0.319315 secs (105082557 bytes/sec)
# df -h
Filesystem Size Used Avail Capacity Mounted on
/dev/da0s1a 496M 182M 274M 40% /
devfs 1.0K 1.0K 0B 100% /dev
/dev/da0s1e 30G 1.2G 26G 4% /usr
/dev/da0s1d 496M 3.4M 453M 1% /var
/dev/ccd0 11T 714G 9.0T 7% /bigdisk
Ken
--
Kenneth Merry
ken at FreeBSD.ORG
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