-- "Jason H. Smith" <jason@oes.co.th>
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.
So if you want RAID5 and LVM, consider hardware acceleration.
I'm having perfectly good luck with a DAC960 and 4 x IBM 160MB devices. The LVM issues pretty much drop out since the drives are grouped into one "device" at the hardware level. Striping the filesystem (ext2) helps (see the stride option of mkfs.ext2), so does turning on write caching.
--
Steven Lembark 2930 W. Palmer
Workhorse Computing Chicago, IL 60647
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