I have a scenario (tray failure) that I am trying to "predict" how zfs
will behave and am looking for some input . Coming from the world of
svm, ZFS is WAY different ;)
If we have 2 racks, containing 4 trays each, 2 6540's that present 8D
Raid5 luns to the OS/zfs and through zfs we setup a mirror config such
that: I'm oversimplifying here but...
Rack 1 - Tray 1 = lun 0 Rack 2 - Tray 1 = lun 4
Rack 1 - Tray 2 = lun 1 Rack 2 - Tray 2 = lun 5
Rack 1 - Tray 3 = lun 2 Rack 2 - Tray 3 = lun 6
Rack 1 - Tray 4 = lun 3 Rack 2 - Tray 4 = lun 7
so the zpool command would be:
zpool create somepool mirror 0 4 mirror 1 5 mirror 2 6 mirror 3 7
<---(just for ease of explanation using the "supposed" lun numbers)
so a status output would look similar to:
somepool
mirror
0
4
mirror
1
5
mirror
3
6
mirror
4
7
Now in the VERY unlikely event that we lost the first tray in each rack
which contain 0 and 4 respectively...
somepool
mirror ---
0 |
4 | Bye Bye
---
mirror
1
5
mirror
3
6
mirror
4
7
Would the entire "somepool" zpool die? Would it affect ALL users in
this pool or a portion of the users? Is there a way in zfs to be able
to tell what individual users are hosed (my group is a bunch of control
freaks ;)? How would zfs react to something like this? Also any
feedback on a better way to do this is more then welcome
Please keep in mind I am a "ZFS noob" so detailed explanations would be
awesome.
Thanks in advance
Robb
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