Talk:LVM on RAID

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Revision as of 23:11, 2 April 2006 by The Belgain (talk | contribs) (Expanding RAID5 arrays is possible)

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how about continuing this entry to show how to add more drives and extend the LVM/filesystem?

Read performance on LVM is bad

I have a four 250GB disk software raid5 setup using mdadm. After extensive performancetesting I selected XFS. Following your suggestion to add LVM I did some extra performancetesting. With LVM my readperformance drops from 109Mb/s to 93Mb/s, write and re-write performance stays constant. FYI. --renzo-AT-xs4all-DOT-nl 2006/02/21

Expanding RAID5 arrays is possible

It's probably worth noting in this article that it is possible to increase the size of a RAID5 array by adding an extra drive. EVMS has been able to do this for a while (but requires the array to be taken offline). Support is now being added to the actual kernel driver and mdadm to be able to do online resizes of RAID5 arrays.

The advantage of this over just using LVM to add separate arrays is that you don't waste an extra drive for parity.

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