SUMMARY: mirror 2 different geometry disks?

From: Daryl.Mitchell@us.o-i.com
Date: Mon Aug 01 2005 - 11:29:15 EDT


I received a ton of replies. Many thanks to everyone. The consensus was
that Yes, this mirroring will work as long as submirror 2 is slightly
larger. And it did work flawlessly. The only caveat is that if I lose
submirror 1 (the smaller disk), I'll probably need another 18GB drive to
restore the mirror pair. I'm cool with that because we have a bunch of
18GB spares here doing nothing.

Thanks gang and cheers.
Daryl

# /usr/opt/SUNWmd/sbin/metastat
d0: Mirror
    Submirror 0: d10
      State: Okay
    Submirror 1: d20
      State: Okay
    Pass: 1
    Read option: roundrobin (default)
    Write option: parallel (default)
    Size: 5084856 blocks

d10: Submirror of d0
    State: Okay
    Size: 5084856 blocks
    Stripe 0:
        Device Start Block Dbase State Hot Spare
        c0t0d0s0 0 No Okay

d20: Submirror of d0
    State: Okay
    Size: 5088960 blocks
    Stripe 0:
        Device Start Block Dbase State Hot Spare
        c0t2d0s0 0 No Okay

d1: Mirror
    Submirror 0: d11
      State: Okay
    Submirror 1: d21
      State: Okay
    Pass: 1
    Read option: roundrobin (default)
    Write option: parallel (default)
    Size: 4194288 blocks

d11: Submirror of d1
    State: Okay
    Size: 4194288 blocks
    Stripe 0:
        Device Start Block Dbase State Hot Spare
        c0t0d0s1 0 No Okay

d21: Submirror of d1
    State: Okay
    Size: 4198392 blocks
    Stripe 0:
        Device Start Block Dbase State Hot Spare
        c0t2d0s1 0 No Okay

d3: Mirror
    Submirror 0: d13
      State: Okay
    Submirror 1: d23
      State: Okay
    Pass: 1
    Read option: roundrobin (default)
    Write option: parallel (default)
    Size: 4197879 blocks

d13: Submirror of d3
    State: Okay
    Size: 4197879 blocks
    Stripe 0:
        Device Start Block Dbase State Hot Spare
        c0t0d0s3 0 No Okay

d23: Submirror of d3
    State: Okay
    Size: 4198392 blocks
    Stripe 0:
        Device Start Block Dbase State Hot Spare
        c0t2d0s3 0 No Okay

d4: Mirror
    Submirror 0: d14
      State: Okay
    Submirror 1: d24
      State: Okay
    Pass: 1
    Read option: roundrobin (default)
    Write option: parallel (default)
    Size: 4197879 blocks

d14: Submirror of d4
    State: Okay
    Size: 4197879 blocks
    Stripe 0:
        Device Start Block Dbase State Hot Spare
        c0t0d0s4 0 No Okay

d24: Submirror of d4
    State: Okay
    Size: 4198392 blocks
    Stripe 0:
        Device Start Block Dbase State Hot Spare
        c0t2d0s4 0 No Okay

                                                                           
             Daryl A
             Mitchell/User/O-I
                                                                        To
             07/29/2005 08:59 sunmanagers@sunmanagers.org
             AM cc
                                                                           
                                                                   Subject
                                       mirror 2 different geometry disks?
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           

I have a 9gb and an 18gb drive in one of my E10K's D1000. I'd like to
disksuite them up for a more fault tolerant boot pair. The 9gb drive is my
current boot drive. But when I try to fmthard the 18gb drive, it complains
that the sector ends not at the cylinder end or something. So I got it
partitioned as close as I could manually. Can I mirror these up with
disksuite still even though the geometries are not exactly alike? I've
made the new disk partitions slightly bigger than the original.

D

CURRENT BOOT DISK:

Total disk cylinders available: 4924 + 2 (reserved cylinders)

Part Tag Flag Cylinders Size Blocks
  0 root wm 0 - 1415 2.42GB (1416/0/0) 5084856
  1 swap wu 1416 - 2583 2.00GB (1168/0/0) 4194288
  2 backup wm 0 - 4923 8.43GB (4924/0/0) 17682084
  3 var wm 2584 - 3752 2.00GB (1169/0/0) 4197879
  4 unassigned wm 3753 - 4921 2.00GB (1169/0/0) 4197879
  5 unassigned wm 4922 - 4922 1.75MB (1/0/0) 3591
  6 unassigned wm 4923 - 4923 1.75MB (1/0/0) 3591
  7 unassigned wm 0 0 (0/0/0) 0

I'D LIKE TO MIRROR TO THIS NEW 18GB DRIVE:

Total disk cylinders available: 7506 + 2 (reserved cylinders)

Part Tag Flag Cylinders Size Blocks
  0 root wm 0 - 1079 2.43GB (1080/0/0) 5088960
  1 swap wu 1080 - 1970 2.00GB (891/0/0) 4198392
  2 backup wm 0 - 7505 16.86GB (7506/0/0) 35368272
  3 var wm 1971 - 2861 2.00GB (891/0/0) 4198392
  4 unassigned wm 2862 - 3752 2.00GB (891/0/0) 4198392
  5 unassigned wm 3753 - 3753 2.30MB (1/0/0) 4712
  6 unassigned wm 3754 - 3754 2.30MB (1/0/0) 4712
  7 unassigned wm 0 0 (0/0/0) 0
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