----- Original Message ----- | On Jan 11, 2011, at 10:59 AM, Joshua Baker-LePain wrote: | | > On Tue, 11 Jan 2011 at 1:49pm, Digimer wrote | > | >> On 01/11/2011 01:47 PM, aurfalien at gmail.com wrote: | >>> Hi all, | >>> | >>> I've a 30TB hardware based RAID array. | >>> | >>> Wondering what you all thought of using ext4 over XFS. | >>> | >>> I've been a big XFS fan for years as I'm an Irix transplant but | >>> would | >>> like your opinions. | >>> | >>> This 30TB drive will be an NFS exported asset for my users housing | >>> home dirs and other frequently accessed files. | >>> | >> | >> You will need XFS for a single partition that large. You won't be | >> able | >> to make such a large ext4 partition, I don't think. | > | > This is correct. While ext4 theoretically supports volumes (much) | > larger | > than 16TB, the developers don't think it's production ready yet and | > the | > userspace tools don't support it yet. | > | > So, short answer -- XFS is the only way to go. | > | | My RAID has a strip size of of 32KB and a block size of 512bytes. | | I've usually just done blind XFS formats but would like to tune it for | smaller files. Of course big/small is relative but in my env, small | means sub 300MB or so. | | What would your XFS tuning params be for such an env? | | - aurf | _______________________________________________ | CentOS mailing list | CentOS at centos.org | http://lists.centos.org/mailman/listinfo/centos Your sw and su options should match the number of *usable* data disk and your stripe size to best optimize performance. Do *not* create a volume this large unless you have a lot of memory. If you ever need to run an xfs_check on the volume you could be looking at 10s of GB of memory. I just ran an xfs_check on an 11TB volume used by our medical imaging lab and the xfs_check/xfs_db process grew to around 32GB of CentOS 5.5 64-bit. -- James A. Peltier Research Computing Group Simon Fraser University - Burnaby Campus Phone : 778-782-6573 Fax : 778-782-3045 E-Mail : jpeltier at sfu.ca Website : http://www.sfu.ca/itservices http://blogs.sfu.ca/people/jpeltier