[linux-lvm] LVM on Raid 5 Performance?

Herbert Poetzl 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 ...


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