Re: Optimal XFS formatting options?
From: Michael Monnerie <hidden>
Date: 2012-01-20 15:52:14
On Dienstag, 17. Januar 2012 Stan Hoeppner wrote:
So to be clear, your issue with the above isn't with my partition alignment math WRT the OP's P2000 array, but is with using XFS stripe alignment in general, correct?
Yes. I just wanted to document this as people often expand RAIDs and forget to apply the changes to stripe width.
There is one really simple way around this issue you describe: don't add drives to an existing array. Simply create another array with new disks, create a new aligned XFS on the array, and mount the filesystem in an appropriate location. There is no 11th Commandment stating one must have a single massive XFS atop all of one's disks. ;) There is little to no application software today that can't be configured to store its data files across multiple directories. So there's no need to box oneself into the corner you describe above.
It's a management burden to do that. I've learned that systems usually are strictly structured in their configuration, so it's often better to extend a RAID and to keep the config, as this is cheaper in the end. At least for the salaries of good admins here in Europe ;-) -- mit freundlichen Grüssen, Michael Monnerie, Ing. BSc it-management Internet Services: Protéger http://proteger.at [gesprochen: Prot-e-schee] Tel: +43 660 / 415 6531