XFS perte de disque 1To :(

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Bonjour,

Je suis en environement virtuel VMWare.
J'ai crée un disque de 5To:
[root]# fdisk -l /dev/sde
Disk /dev/sde: 5497.6 GB, 5497558138880 bytes
255 heads, 63 sectors/track, 668373 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Dans lequel j'ai crée un PV, VG et LV
[root]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lv_add vg_add -wi-ao---- 5.00t

Ensuite j'ai mis un fs XFS et je me retrouve avec une taille de 4To
[root]# df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/drbd0 xfs 4.0T 522M 4.0T 1% /add

Le XFS info donne:
[root@]# xfs_info /add
meta-data=/dev/drbd0 isize=256 agcount=83, agsize=13041664 blks
= sectsz=512 attr=2
data = bsize=4096 blocks=1073446912, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0
log =internal bsize=4096 blocks=25472, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0

XFS GROW donne:
[root]# xfs_growfs -d /add
meta-data=/dev/drbd0 isize=256 agcount=83, agsize=13041664 blks
= sectsz=512 attr=2
data = bsize=4096 blocks=1073446912, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0
log =internal bsize=4096 blocks=25472, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data size unchanged, skipping

Je ne comprends pas ou sont passé les 1To :(
Quelqu'un a une idée ?

Responses

Please have a look at http://www.vinidox.com/linux/filesystem/xfs-for-large-filesystems/
Your parameter imaxpct=25 results in 25% of your volume to be reserved for inodes and thus you "lose" 1 TB.

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