Eric Sandeen a écrit :
jehan procaccia wrote:
Other inodes incriminated showed the same result -> over-quota . So
if user data finally cannot be written, after all ... quota wouldn't
allow it anyway .
The unfortunate thing in your situation though is that the user
-thought- it did get written, just FYI.
When quota is working properly, the denial is obvious up front.
OK, indeed it's not fair for the users !
I had the time to experiment an ext4 FS mounted with -nodelalloc, and
now quotas seems to work fine with it ;-) .
here's a test on a FS mounted with -nodelalloc
while writing with dd for an amount of data between interval soft 300M
and hard 330M, it worked fine:
[test@b03-05 ~]$ dd if=/dev/zero of=./big-101M.dd bs=1024 count=101000
103424000 octets (103 MB) copiés, 9,06256 s, 11,4 MB/s
$ quota -s test
/dev/mapper/VolGroup03S2IA-LogVolS2ia01
317M* 293M 323M 7days 1760 0 0
Then, user "test" writes another 100 Mb and fails as expected :
[test@b03-05 ~]$ dd if=/dev/zero of=./big-102M.dd bs=1024 count=102000
dd: fermeture du fichier de sortie `./big-102M.dd': Débordement du
quota d'espace disque
$ quota -s test
/dev/mapper/VolGroup03S2IA-LogVolS2ia01
323M* 293M 323M 6days 1761 0 0
[root@gizeh /disk00/test/test]
$ ll big*
-rw-r--r-- 1 test mci 103424000 Sep 21 11:11 big-101M.dd
-rw-r--r-- 1 test mci 35729408 Sep 21 11:13 big-102M.dd
however in terms of performances, it seriously drops (nearly 50% !)
with -nodelalloc on the NFS disk server, here's a simple local dd write
test:
ext4 -nodelalloc
[root@gizeh /disk00]
$ dd if=/dev/zero of=./big-300M.dd bs=1024 count=300000
307200000 bytes (307 MB) copied, 1.20125 seconds, 256 MB/s
ext4 -delalloc
[root@gizeh /disk01]
$ dd if=/dev/zero of=./big-300M.dd bs=1024 count=300000
307200000 bytes (307 MB) copied, 0.752382 seconds, 408 MB/s
however, the same test from an NFS workstation shows very small
differences between partition mounted with nodelalloc and delalloc:
-nodealloc + NFS
$ dd if=/dev/zero of=./big-100M.dd bs=1024 count=100000
102400000 octets (102 MB) copiés, 9,09703 s, 11,3 MB/s
delalloc + NFS
$ dd if=/dev/zero of=./big-100M.dd bs=1024 count=100000
102400000 octets (102 MB) copiés, 9,00392 s, 11,4 MB/s
I supose that NFS is the bottleneck !
I will announce a maintenance on that server in order to remount my 12
x 200GB partitions with -nodelalloc, if ever performances drops too much
, then I'll probably choose to set quotas off until a redhat kernel
package provides a solution .
does 2.6.31 already patche to deal correclty with delalloc and quotas ?
Thanks .
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