Re: creating a new 80 TB XFS

Le Fri, 24 Feb 2012 13:52:40 +0100
Richard Ems [off-list ref] écrivait:

Hi list,

We are getting now 32 x 3 TB Hitachi SATA HDDs.
I plan to configure them in a single RAID 6 set with one or two
hot-standby discs. The raw storage space will then be 28 x 3 TB = 84
TB. On this one RAID set I will create only one volume.
Any thoughts on this?

If you'd rather go for more safety you could build 2 16 drives RAID-6
arrays instead. I'd be somewhat reluctant to make a 30 drives array
--though current drives are quite safe apparently.

*MKFS*
We also heavily use ACLs for almost all of our files. Christoph
Hellwig suggested in a previous mail to use "-i size=512" on XFS
creation, so my mkfs.xfs would look something like:

mkfs.xfs -i size=512 -d su=stripe_size,sw=28 -L Backup_2 /dev/sdX1

Looks OK to me.
 

*MOUNT*
On mount I will use the options

mount -o noatime,nobarrier,nofail,logbufs=8,logbsize=256k,inode64
/dev/sdX1 /mount_point

I think that the logbufs/logbsize option matches the default here. Use
delaylog if applicable. See the xfs FAQ.
 

What about the largeio mount option? In which cases would it be
useful?

If you're mostly writing/reading large files. Like really large
(several megabytes and more).

-- 
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Emmanuel Florac     |   Direction technique
                    |   Intellique
                    |	[off-list ref]
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