MSA Storage Disks Upgrade

[Torsten.]

You have 10 disks in RAID0+1, this means the data are on 5 disks, the mirror of this data is on the remaining 5 disks.

The goal is to have 5 disks on the left side of the MSA on bus A1, the other 5 disks with the mirror on the right side on bus A2.

So you are fully redundant in case of one half will fail.


Currently you must not loose the right half, because the "original" AND the mirror disks are on the same bus.

Relocate the disks ONLY while the server is down and powered off!

I hope this is clear now ...

[rianui]

Hi Torsten,

Kindly bear with me. I had shut down the system to check the spare numbers of the cache batteries. After connecting everything back and with both cables on A1 and A2 I collected the sautil info again. Just confirm and then I will proceed with the next course of action.

Regards,

Rianui

[Torsten.]

Looks like you switched the cables between A1 and A2 now:

---- SCSI DEVICE SUMMARY -----------------------------------------------------

  Location   Ch    ID    Type         Capacity   Status

  external    1     0    DISK         36.4 GB    OK
  external    1     1    DISK         36.4 GB    OK
  external    1     2    DISK         36.4 GB    OK
  external    1     3    DISK         36.4 GB    OK
  external    1     4    DISK         36.4 GB    OK
  external    1     5    DISK         36.4 GB    OK
  external    1     8    DISK         36.4 GB    OK
  external    1    15    PROCESSOR
  external    2     0    DISK         36.4 GB    OK
  external    2     1    DISK         36.4 GB    OK
  external    2     2    DISK         36.4 GB    OK
  external    2     3    DISK         36.4 GB    UNASSIGNED
  external    2     4    DISK         36.4 GB    UNASSIGNED
  external    2     7    PROCESSOR

This is not a problem.

When RECOVERING has finished, re-sort the disks as I told you (with server switched off!!!)

[rianui]

Hi Torsten,

...relocate the disks from slots 13 and 14 to slots 4 and 5....slot 13 and 14 has blanks and no disks.

I guess I'm still not getting you correctly. When RAID 1+0 is configured, assuming  two disks adjacent to each other, wouldn't I remove the second disk from each pair?

The client has locked the site until Monday :( I will run your instructions and let you know the progress as soon as I get to site.

Thanks a lot!

Rianui

[Torsten.]

Look at this:

external 1 0 DISK 36.4 GB OK
external 1 1 DISK 36.4 GB OK
external 1 2 DISK 36.4 GB OK
external 1 3 DISK 36.4 GB OK
external 1 4 DISK 36.4 GB OK
external 1 5 DISK 36.4 GB OK
external 1 8 DISK 36.4 GB OK
external 1 15 PROCESSOR
external 2 0 DISK 36.4 GB OK
external 2 1 DISK 36.4 GB OK
external 2 2 DISK 36.4 GB OK

The red disks are on one bus (A1), the blue disks are on the other (A2).

But you should have 5 "red" disks and 5 "blue" disks.

Is it more clear now?

[rianui]

Hi Torsten,

Yes I understand that Channel A1 has seven disks on it and Channel A2 has three disks. Once RECOVERING is complete I should move two disks (disk ID 5&8) to Channel A2, right. Then slot in my two new drives to the next empty slots on Channel A1 and Channel A2 (slot 6&13) respectively. This is how I understand it now.

Regards,

Rianui

[Torsten.]

Correct.

Swap the disks when the server is powered off.

[Torsten.]

Any news?

[rianui]

Hi Torsten,

Yes, I have moved two disks from slots 5&6 on the left side of the enclosure to the right side in slot 10&11. I then added my two new drives to slot 5 and slot 12. Attached are two documents. One before I did the changes and the other after the changes.

Regards,

Rianui

[Torsten.]

This looks good!


If you now can tell how do you use /dev/dsk/c4t0d0 , we can decide what to do with the 2 new disks.

(used by VxVM or as a plain disk?)