At a new job, I've inherited a handful of Solaris 10 SunFire V240 servers.
I noticed that the metadevices are not consistent, in a way that I've not seen before....
internal mirrored disks:
metadevice d60 has c1t0d0s6 as submirror 0 (d61) and c1t1d0s6 as submirror 1 (d62)
metadevice d40 has c1t1d0s4 as submirror 0 (d42) and c1t0d0s4 as submirror 1 (d41)
etc....
Is this a problem? It is certainly strange. Half the mirrors have disk c1t0d0 as submirror 0 and c1t1d0 as submirror 1. The other half of the mirrors have disk c1t1d0 as submirror 0 and disk c1t0d0 as submirror 1.
I think I know how it happened:
When the previous sysadmin installed recommended patches, the mirrors were broken (some, but not all) and then a few days later the devices were synced (metattach). By only breaking some of the mirrors to install the patches, and then rebooting, things got "reversed" in metadeviceland.
Is this a problem? What happens if disk c0t0d0 dies, and needs to be replaced?
Here is an example. 3 metadevices on this system are one way, and 3 are the other way, with respect to their submirrors:
Code:
$ metastat | more
d60: Mirror
Submirror 0: d61
State: Okay
Submirror 1: d62
State: Okay
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 8395200 blocks (4.0 GB)
d61: Submirror of d60
State: Okay
Size: 8395200 blocks (4.0 GB)
Stripe 0:
Device Start Block Dbase State Reloc Hot Spare
c1t0d0s6 0 No Okay Yes
d62: Submirror of d60
State: Okay
Size: 8395200 blocks (4.0 GB)
Stripe 0:
Device Start Block Dbase State Reloc Hot Spare
c1t1d0s6 0 No Okay Yes
d40: Mirror
Submirror 0: d42
State: Okay
Submirror 1: d41
State: Okay
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 16780224 blocks (8.0 GB)
d42: Submirror of d40
State: Okay
Size: 16780224 blocks (8.0 GB)
Stripe 0:
Device Start Block Dbase State Reloc Hot Spare
c1t1d0s4 0 No Okay Yes
d41: Submirror of d40
State: Okay
Size: 16780224 blocks (8.0 GB)
Stripe 0:
Device Start Block Dbase State Reloc Hot Spare
c1t0d0s4 0 No Okay Yes
Last edited by Scott; 06-22-2010 at 10:11 AM..
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