Some more insight:
I have the following zpools setup:
aaa_zvol: 2 250GB IDE in Raid0
storage raidZ1:
1 500 GB IDE
1 500 GB SATA
/..../aaa_zvol/aaa_zvol (the zvol exported from the aaa_zvol pool)
When I run the array in a degraded mode, ie place one of the drives in the
offline state, the kernel doesn''t seem to spike. When I put the offline
drive online and resliver, the 100% kernel usage appears when transferring from
the network to the full operational array.
I remove each of the drives in turn and tried this experiment, so it
doesn''t seem to be down to a specific drive/interface.
I wonder if using a zvol as part of a raidz is an issue?
Also, cross-posting to ZFS list.
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