Hi Bill,
This is hardware raid vs. software raid, and you need to understand and
use the correct tool to administer each one.
Hardware raid uses a dedicated controller (managed via raidctl) which
mirrors the disk and presents a single "disk" for the OS to use. The os
must have a driver for the raid card, but otherwise does not have to
care what the underlying device is (mirror, stripe, raid5, etc)
Software raid uses a kernel module to do the mirroring. You can still
see the individual drives (c1t0d0 and c1t1d0 in your output below), but
you access it using the top level metadevice d6. SVM will make sure any
writes to d6 are written to both d16 and d26, and hence to c1t0d0s6 and
c1t1d0s6.
The warning about "no databases" from metastat is the first clue that it
is not using software raid. If raidctl produces output (other than an
obvious error message), then you are probably using hardware raid.
Hope that helps,
Brian
Bill Ward wrote:
Good day,
We had one of ourv245 with raid1 mirroring appear to loose a drive. metastat
returns the following :
bash-3.00# raidctl
No RAID volumes found
bash-3.00# metastat
d6: Mirror
Submirror 0: d16
State: Needs maintenance
Submirror 1: d26
State: Okay
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 56894016 blocks (27 GB)
d16: Submirror of d6
State: Needs maintenance
Invoke: metareplace d6 c1t0d0s6 <new device>
Size: 56894016 blocks (27 GB)
Stripe 0:
Device Start Block Dbase State Reloc Hot Spare
c1t0d0s6 0 No Maintenance Yes
d26: Submirror of d6
State: Okay
Size: 56894016 blocks (27 GB)
Stripe 0:
Device Start Block Dbase State Reloc Hot Spare
c1t1d0s6 0 No Okay Yes
[elided]
Device Relocation Information:
Device Reloc Device ID
c1t1d0 Yes id1,s...@n500000e01579f140
c1t0d0 Yes id1,s...@n500000e0157a12f0
bash-3.00# raidctl
No RAID volumes found
But as you can see, raidctl shows no RAID.
On our T2000 or T5220 that are setup with mirroring they do show raidctl but
metastat returns an error that there are no existing databases.
Any reason why?
thanks
--
Brian Ruthven
Solaris Revenue Product Engineering
Sun Microsystems UK
Sparc House, Guillemont Park, Camberley, GU17 9QG
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