[CentOS] XFS on a 25 TB device

Peter Kjellstrom cap at nsc.liu.se
Wed Sep 29 12:58:19 EDT 2010


On Wednesday 29 September 2010, Boris Epstein wrote:
> On Wed, Sep 29, 2010 at 11:53 AM, James A. Peltier <jpeltier at sfu.ca> wrote:
> > | However, given the size of the device I assume that this is a raid of
> > | some
> > | sort. You'll want to make sure to run mkfs.xfs with the proper stripe
> > | parameters to get the alignment right. Also, you may want to make sure
> > | your
> > | LVM or partition table is properly aligned.
...
> I am wondering if I need to worry about stripe and width though as
> mine resides on a logical volume residing on a hardware-controlled
> RAID 6 device (i.e., one slice as far as the OS is concerned).

That is why you need to consider it. If the device is aligned on stripe size 
(chunk size * (number of drives - 2 for raid6 parity)) and the filesystem is 
made aware it can put stuff (files, metadata, etc.) so that a minimum of 
stripes are touched (less I/O done).

/Peter

> Boris.
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