[CentOS] 40TB File System Recommendations

Tue Apr 12 08:21:24 UTC 2011
Marian Marinov <mm at yuhu.biz>

On Tuesday 12 April 2011 10:36:54 Alain Péan wrote:
> Le 12/04/2011 09:23, Matthew Feinberg a écrit :
> > Hello All
> > 
> > I have a brand spanking new 40TB Hardware Raid6 array to play around
> > with. I am looking for recommendations for which filesystem to use. I am
> > trying not to break this up into multiple file systems as we are going
> > to use it for backups. Other factors is performance and reliability.
> > 
> > CentOS 5.6
> > 
> > array is /dev/sdb
> > 
> > So here is what I have tried so far
> > reiserfs is limited to 16TB
> > ext4 does not seem to be fully baked in 5.6 yet. parted 1.8 does not
> > support creating ext4 (strange)
> > 
> > Anyone work with large filesystems like this that have any
> > suggestions/recommendations?
> Hi Matthew,
> I would go for xfs, which is now supported in CentOS. This is what I use
> for a 16 TB storage, with CentOS 5.3 (Rocks Cluster), and it woks fine.
> No problem with lengthy fsck, as with ext3 (which does not support such
> capacities). I did not try yet ext4...
> Alain

I have Raid6 Arrays with 30TB. We have tested XFS and its write performance 
was really dissapointing. So we looked at Ext4. It is really good for our 
workloads, but it lacks the ability to grow over 16TB. So we crated two 
partitions on the raid with ext4. 

The RAID rebuild time is around 2 days, max 3 if the workload is higher. So I 
presume that for 40TB it will be around 4 days.

Best regards,
Marian Marinov
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