On Mon, Dec 20, 2010 at 05:20:18AM -0500, Justin Piszcz wrote:
> Hi,
>
> I am looking at FS to use for a possible 43TB array.
> If there is a problem with a volume this large, how much ram will
> xfs_repair need to fsck the volume?
$ dd if=/dev/zero of=/mnt/scratch/test.img bs=1048576 count=1 seek=50000000
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.00463602 s, 226 MB/s
$ ls -lh /mnt/scratch/test.img
-rw-r--r-- 1 dave dave 48T Dec 21 09:22 /mnt/scratch/test.img
$ sudo mkfs.xfs -d name=/mnt/scratch/test.img,file,size=43t
[sudo] password for dave:
meta-data=/mnt/scratch/test.img isize=256 agcount=43, agsize=268435455 blks
= sectsz=512 attr=2
data = bsize=4096 blocks=11542724565, imaxpct=5
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0
log =internal log bsize=4096 blocks=521728, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
$ sudo xfs_repair -m 1 -vv /mnt/scratch/test.img
Phase 1 - find and verify superblock...
- max_mem = 1024, icount = 64, imem = 0, dblock = 11542724565, dmem = 5636095
Required memory for repair is greater that the maximum specified with the -m option. Please increase it to at least 5552
$
Not taking inodes into account, you'll need at least 5.5GB of RAM to run
xfs_repair on a 43TB filesystem.
Cheers,
Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
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