topic Re: Autoraid 12H changing disks. in Disk Enclosures

Autoraid 12H changing disks.

bert ponet — Thu, 17 Aug 2000 11:09:32 GMT

The autoraid 12 H manual says " To ensure optimal performance, the disk modules should be distibuted equally across the internal SCSI buses". We have a system where the diskmodules are not installed in the correct order. The LUN's are already used. Is there a way to redistribute the disks without any data loss ???

Re: Autoraid 12H changing disks.

Antoanetta Naghiu — Thu, 17 Aug 2000 14:05:36 GMT

I guess, it will be nice to have more details. How many disks you have, what capacity and how are they distributed.
Generally speaking, you can add new disks on fly. You can take out a disk and the array is able to re-distribute data across the other disks. Depends on the number of disks you may or you may not take out the second on (need certain precent of disks available).

Re: Autoraid 12H changing disks.

Brian M. Fisher — Thu, 17 Aug 2000 17:23:09 GMT

If you have hot-spare enabled you should be able to remove one disk at a time, wait for the re-build to complete, then put the disk back in another location.

I would definitely recommend doing this after a GOOD backup during off hours.

Brian
<*(((>< er

Re: Autoraid 12H changing disks.

Frank Skibbe — Fri, 18 Aug 2000 08:50:50 GMT

The follow up want Brain Fisher say:
If you have hot-spare enabled you should be able to remove one disk at a time, wait for the rebuild to complete, then put the disk back in another location.

I would definitely recommend doing this after a
*** GOOD ***backup during off hours.

Load order Top to down and left to right.

Model for 12H

A6=Bus 2 B6 =Bus 3
A5=Bus 0 B5 =Bus 1
A4=Bus 0 B4= Bus 1
A3=Bus 2 B3= Bus 3
A2=Bus 2 B2= Bus 3
A1=Bus 0 B1= Bus 1

Re: Autoraid 12H changing disks.

Bob Inglis — Fri, 18 Aug 2000 13:00:55 GMT

Caution: Before making any changes to the configuration of your AutoRaid or to any other Disk Array for that matter, make sure it has the latest micro-code installed and make a full backup just in case.

The preferred configuration for an AutoRaid is to load the disks into the array from the top down, an equal number of disks on each side of the array.
This is for best cooling only.

The internal SCSI buss details are:
Bus 0: Drives A1, A4 & A5
Bus 1: Drives B1, B4 & B5
Bus 2: Drives A2, A3 & A6
Bus 3: Drives B2, B3 & B6

I you load the array top down OR bottom up the busses will be balanced as well as is possible.

The AutoRaid doesn?t care which slots the disk are in.
Upon power up (following an orderly shut down of the AutoRaid) the AutoRaid will auto-discover the disks.

If you wish to reorganize the disks here is a step by step.

1) Shut down the system (not necessary if you want to completely deactivate everything using the AutoRaid)
2) Shut down the array (from the front panel of the array or use ?arraymgr ?s shut ?, don?t just power it off)
3) Power off the array
4) Rearrange the disk in the preferred locations
5) Power on the AutoRaid (ensure it completes testing and goes ?READY?)
6) Reboot the system