topic Re: Smart Array 6402 Help in Disk Enclosures

Smart Array 6402 Help

Vincent_5 — Mon, 04 Feb 2008 00:24:53 GMT

Hi Guys,
Can someone help. I have a rx2620 connected to a MSA 30 with one single port scsi io module. This single port io module is currently connected to a smart array 6402 card with a raid 5 configuration of 3 x 72GB harddisk. The operating system is 11.23. I have check with HP and confirm that I can replace the single io module to dual port io module in order to run split bus on the MSA. Question, Can I just replace the io module with the existing lun intact. What have I to backup on the array in case if I can't retrive the lun backup. Can I have the steps to perform the backup???

Regards
Vincent

Re: Smart Array 6402 Help

Khairy — Mon, 04 Feb 2008 03:32:32 GMT

hi vincent,

msa30 single bus scsi-id are as follow (from left to right):

slot - scsi ID
==============
1 - 0
2 - 1
3 - 2
4 - 3
5 - 4
6 - 5
7 - 8
8 - 9
9 - 10
10 - 11
11 - 12
12 - 13
13 - 14
14 - 15

After you installed the dual bus IO module, it will become like this:

slot - scsi ID - Bus
==============
1 - 0 - bus A
2 - 1 - bus A
3 - 2 - bus A
4 - 3 - bus A
5 - 4 - bus A
6 - 5 - bus A
7 - 8 - bus A
8 - 0 - bus B
9 - 1 - bus B
10 - 2 - bus B
11 - 3 - bus B
12 - 4 - bus B
13 - 5 - bus B
14 - 8 - bus B

Take note on the disk positions. If you have them installed in any slots (either slots 1 til 8 - bus A). You will be fine.

For precaution, backup the filesystems that mounted from MSA30.

# fbackup -f /dev/rmt/0m -i /mount_points

Make a backup of current vg. Ignore the error message saying vg still active.
# vgexport -p -m /vg.map vgXX

Then edit the /etc/fstab and put comments to filesystem which mount from MSA30.

Shutdown the server and power off storage and replace the IO module. Attach the scsi cables accordingly (io bus module, bus A). Switch on the MSA30, then power on server.

When the server power up, check for disks.
# ioscan -funC disk

If the disk are detected and still bear the same device. Then you can safely activate the vg and mount the filesystem.
# vgchange -a y vgXX.
# mount /mount_points

If you have the disks installed in other slots (slot 9-15), then scsi ID will change definately.

This is where the vg map file becomes handy. Upon bootup, new device file will appears. Check this with ioscan and sautil command.

# ioscan -kfnd ciss
# sautil /dev/cissX | more

Use vgexport and vgimport to import back the disks (assumes the new raid 5 volume is c5t0d0).
# vgexport vgXX
# vgimport -m /vgXX.map vgXX /dev/dsk/c5t0d0

And mount back.
# mount /dev/vgXX/lvolX /mount_point

Don't forget to change /etc/fstab.

Good luck!

Re: Smart Array 6402 Help

Torsten. — Mon, 04 Feb 2008 16:02:43 GMT

You have currently 3 disks - do you want to add more disks?
If the 3 disks will remain in the first slots of the MSA30 nothing will change.
Do you have the internal disks of the server connected to the smartarray too?

The output of the saconfig tool will clarify.

BTW, how did you solve this thread?
http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1193625

Re: Smart Array 6402 Help

Vincent_5 — Sat, 09 Feb 2008 02:37:39 GMT

Hi Torsen,
Thanks for the input, as for the previous thread on the MSA 30. I have tested with creating a new array of 3 disk raid 5 and expand by adding one more disk and it work, but that was done through common desktop environment. I guess the problem lies on the terminal session on Hyper terminal where invisible is detected when backspace key is used. Anyway, I have not tested on the original array as is still live. At leastm now I know that is proven to work on a raid 5 array. The only thing is to get the drivers to the latest.

As for this case, existing i have 4 x 72GB disk, I'm planning to add another 3 x 72GB disk on the 2nd bus in order to get the two io running. Her I will merge bus 1 and 2 to the same array by expanding the array. There is 2 x 72GB internal harddisk raid 1

Regards
VIncent