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I recently upgraded our SXCE svn_72 box to OpenSolaris 2009.06 (snv_111b). It wants to me to upgrade my zpool to the latest version now.

We need to plan upfront for things like zpool scrub because of the amount of time it takes and the IO intensive nature of the command. Our virtual machine disks on it grind to a halt.

Should I expect the same for zpool upgrade? We have about 1.5TB spread across two raidz1's made up of 5 and 7 disks respectively.

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The zpool upgrade isn't as IO intensive as zpool scrub since it doesn't have to touch the all the data in the pool. It just lets you use new features (which changes some on disk ZFS data structures in a backward incompatible way).

You can expect the upgrade of 1.5 TB to take about 1 second.

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Agree zpool upgrade is very quick...almost instant. –  3dinfluence Oct 24 '09 at 21:28
    
Only took a second or two. No impact. Thx guys! –  Sysadminicus Oct 28 '09 at 22:23

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