[illumos-Discuss] ZFS spare disk usage issue

[Roy Sigurd Karlsbakk]

Hi all

I just did a small test on RAIDz2 to check whether my suspicion was right about ZFS not treating spares as replicas/copies of drives, and I think I've found it true. The short story: If two spares replaces two drives in raidz2, losing a third drive, even with the spares active, makes the pool unavailable. See full report on

ODT: http://karlsbakk.net/ZFS/ZFS%20Spare%20disk%20usage.odt
PDF: http://karlsbakk.net/ZFS/ZFS%20Spare%20disk%20usage.pdf

Vennlige hilsener / Best regards

roy
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Roy Sigurd Karlsbakk
(+47) 97542685
roy at karlsbakk.net
http://blogg.karlsbakk.net/
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