topic Re: VA7400 mirroring check in Disk Enclosures

VA7400 mirroring check

deepak_9 — Fri, 12 Apr 2002 14:00:22 GMT

Hi ,
We have superdome servers and installed with VA7400. This is configured with raid 0+1. Just want to know how effectively can I check the mirroring established or not .

Re: VA7400 mirroring check

Magdi KAMAL — Fri, 12 Apr 2002 14:08:57 GMT

Hi Deepak,

For verifying if disks ara mirrored, issue the following command :

# lvdisplay -v /dev/vg*/lv* ?? more

I assume in this command that all volume groups start with "vg" and all Logical volume start with "lv".

If you find the output with two Physical Volumes PV1 and PV2 and corresponding disks (ie. /dev/dsk/c0t1d0 and /dev/dsk/c1t1d0 )

that means that the mirroring had been done.

You need to install first MirrorUX software.

Magdi

Re: VA7400 mirroring check

John Carr_2 — Fri, 12 Apr 2002 14:11:59 GMT

Hi

if you dont like command line use can use sam to list the logical volumes which will show mirrors

John.

Re: VA7400 mirroring check

Vincent Fleming — Fri, 12 Apr 2002 19:26:04 GMT

Actually, the VA handles the mirroring within the array on a block-by-block level rather than a disk-by-disk level. There is no way to check if the drives are mirrored because the drives themselves are not mirrored.

When the VA receives a write command, it automatically mirrors that block (and that block only) on two drives.

So, by definition, it's mirrored at all times. If you experience a drive failure, the GUI will show (and I'm sure there's a command-lin equiv, but I don't remember what it is) that the unit is rebuilding the parity to the active spare area. If I recall, it reports it as a redundency loss.

Good luck!

Re: VA7400 mirroring check

deepak_9 — Mon, 15 Apr 2002 12:05:26 GMT

Hi,

But how effectively I can test that it's being mirrored . OR what is the recovery method suppose one of my directory I lost.

Regards

Re: VA7400 mirroring check

Vincent Fleming — Thu, 02 May 2002 12:05:08 GMT

Assign some points and we'll tell you. ;-)