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E3500 running Solaris 8 with dual A1000s attached.
A1000s are mirrored using DiskSuite.

One LUN ( shown below using Group 1 ) had 4 drives:


$> ./drivutil -d syddb621-a1000b


Drives in Group for syddb621-a1000b

Group Drive List [Channel,Id]

Group 1: [1,0]; [2,0]; [1,1]; [2,1];
Group 2: [1,2]; [2,2];
Group 3: [1,4]; [2,4];
Group 4: [2,3];
Group 5: [1,5];



drivutil succeeded!


$> ./drivutil -I syddb621-a1000b


Group Information for syddb621-a1000b

Group No. of RAID No. of Total Remaining
LUNs Level Drives Space(MB) Space(MB)

1 1 0 4 68938 0
2 1 0 2 69385 0
3 1 0 2 34469 0
4 1 0 1 17234 0
5 1 0 1 17234 0



drivutil succeeded!


$> ./drivutil -l syddb621-a1000b
Logical Unit Information for syddb621-a1000b

LUN Group Device RAID Capacity Status
Name Level (MB)

0 1 c4t5d0 0 68938 Optimal
1 2 c4t5d1 0 69385 Optimal
2 3 c4t5d2 0 34469 Optimal
3 4 c4t5d3 0 17234 Optimal
4 5 c4t5d4 0 17234 Optimal

drivutil succeeded!


LUN 0 above is used as a submirror of metadevice, as shown below, as
metadevice d25 ( with d15 as a submirror on the other A1000 ):

$> metastat -p
.......
d5 -m d15 d25 1
d15 1 1 c1t5d0s1
d25 1 1 c4t5d0s1


Furthermore, soft partitions are layered __ON TOP OF__ the d5
metadevice, like so:

$> metastat -p
......
d101 -p d5 -o 1 -b 25165824
d102 -p d5 -o 25165826 -b 16777216
d103 -p d5 -o 41943043 -b 16777216


Now the scenario is:


One of the drives in the LUN was replaced.
Out of the drives [1,0]; [2,0]; [1,1]; [2,1] ... [2,1] was replaced with
a new disk.

The d25 submirror was detached.
Then d25 was re-attached to the d5 metadevice.
After that, metastat shows that d25 was being resynced.
Resyncing has been completed ...


Now wy question now is:
Do I still have to run metarecover ( -d or -m ), or does the fact that
the soft partitions are on top of a mirrored meta device mean that the
soft partitions exten headers are synced as well ?


The link below:

http://sysunconfig.net/unixtips/soft-partitions.html

.... under the section "Recovering Soft Partitions" says:

2. reads through the current replica and creates the soft partitions on
the given slice. This is good to run after a disk fails and gets
replaced with a new one. The option to use on the metarecover command is -m.

That section of the article above does not cover the case of replacing a
disk that has a soft partition on top of a mirrored meta-device on the
replace disk.

Now since I actually replaced a disk, I was wondering if I still need to
do the above.

If I verify / list the soft partitions on top of the d5 metadevice, the
output is shown below ( essentially saying there is no problem ).
However, does it actually reads extent headers on BOTH sides of the mirror ?


$> metarecover -v -n d5 -p
Verifying on-disk structures on d5.
The following extent headers were found on d5.
Name Seq# Type Offset
Length
d101 0 ALLOC 0
25165825
d102 0 ALLOC 25165825
16777217
d103 0 ALLOC 41943042
16777217
NONE 0 END 135024639
1
NONE 0 FREE 58720259
76304380
Found 3 soft partition(s) on d5.
Checking sequence numbers.
d5: Validating soft partition metadb entries.

Verifying device d101.
d101: Status "Okay" is valid.
Extent Number Virtual Offset Physical Offset
Length
0 0 1
25165824

Verifying device d102.
d102: Status "Okay" is valid.
Extent Number Virtual Offset Physical Offset
Length
0 0 25165826
16777216

Verifying device d103.
d103: Status "Okay" is valid.
Extent Number Virtual Offset Physical Offset
Length
0 0 41943043
16777216
d5: Soft Partition metadb configuration is valid

d5: Verifying metadb allocations match extent headers.
Metadb extent:
Name Seq# Type Offset
Length
d101 0 ALLOC 0
25165825
Extent header extent:
Name Seq# Type Offset
Length
d101 0 ALLOC 0
25165825

Metadb extent:
Name Seq# Type Offset
Length
d102 0 ALLOC 25165825
16777217
Extent header extent:
Name Seq# Type Offset
Length
d102 0 ALLOC 25165825
16777217

Metadb extent:
Name Seq# Type Offset
Length
d103 0 ALLOC 41943042
16777217
Extent header extent:
Name Seq# Type Offset
Length
d103 0 ALLOC 41943042
16777217

d5: Soft Partition metadb matches extent header configuration



Any insight appreciated.

Thanks