On 13/04/2011 23:10, Rory Jaffe wrote:
I have a RAID5 array with 4 active devices and two spares. The spares are normally in sleep mode. I ran a resync with: echo repair> /sys/devices/virtual/block/md0/md/sync_action About 20 times (evenly spaced apart) during the resync, the spares were written to, waking them up. Is that behavior desired? It seems to me that it's a waste--I don't know why the resync would bother with the spares.
This isn't an answer to your question, but I would recommend changing to a raid 6 with 5 devices and one spare. Raid 6 gives you /much/ better reliability - you can thing of it as Raid 5 + hot spare with the hot spare already synchronised.
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