Ming Zhang wrote:
On Fri, 2007-04-27 at 09:25 +1200, Ian Collins wrote:
Claus Guttesen wrote:
Hi.
If I create a zpool with the following command:
zpool create tank raidz2 da0 da1 da2 da3 da4 da5 da6 da7
and after a reboot the device names for some reason are changed so da2
and da5 are swapped, either by altering the LUN setting on the storage
or by switching cables/swapping disks etc.?
How will zfs handle that? Will it simply acknowledge that all devices
are present and the pool is intact and report online or will it
complain?
It will just work.
one thing i would guess is that the device id will keep the same and be
used as final proof while path name is only used as a clue.
can somebody confirm this? thx.
Yes, this works. We make use of the device id (which
doesn't change, for almost all circumstances) to identify
luns and route read and write ops appropriately.
The only circumstance that I am aware of where a devid might
change is if a disk or tape's firmware is changed such that
its SCSI INQUIRY page83 response changes. This is a very rare
thing and you the user would have to knowingly kick this off.
cheers,
James C. McPherson
--
Solaris kernel software engineer, system admin and troubleshooter
http://www.jmcp.homeunix.com/blog
Find me on LinkedIn @ http://www.linkedin.com/in/jamescmcpherson
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