[linux-lvm] LVM on Raid 5 Performance?
herbert at 13thfloor.at
Mon May 19 06:31:02 UTC 2003
On Sun, May 18, 2003 at 09:48:27PM +0700, Jason H. Smith wrote:
> I don't know if this answers your question, but maybe search the archives
> for my posts a few months ago. On 2.4, there's a misfeature when using
> LVM with RAID5. Basically, the two will cause your system not to cache
> any data, and to sync to disk immediately, once you create a snapshot
> volume. Apparently, this will be addressed in 2.6.
hmm, I read about that, but I guess that's not what
happens, because a) I do not use the snapshot feature,
and b) the "raid5: switching cache buffer size" messages
only appear if I access the md device directly ...
> So if you want RAID5 and LVM, consider hardware acceleration.
I guess I will choose not to use LVM on this system ...
> GPG: 03EE 9EB8 E500 874A F509 7B95 9B9A 84A1 26E9 4F79
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> linux-lvm at sistina.com
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
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