need help finding disks cXtXdx from server to SAN

[Chris Fadrowski]

I have a n4000 attached to a hitachi 9200. I am looking for a way to correlate cXtXdX numbers to LUNS on the SAN. i have to move some around and if i move them i will delete the data if they are the wrong ones. I am familiar with ioscan but just need some help figuring this out or a way to do this accurately.

[Pete Randall]

Chris,

There's always the old standby "light the lights with dd" test:

dd if=/dev/cXtXdX of=/dev/null bs=1024k

and look for the active LUN.


Pete

[Chris Fadrowski]

i was just about to try that, however on my SAN device, it's all raid groups and they all flash. This works well for local disks. I am finding there is no EASY way to do this other than just trace back LUN ID to controller and then to LUN # on the san and us the "D" in cxtxdx to link them.

[Pete Randall]

Chris,

Yeah, with RAID you're going to be striped most likely, so that kind of kills that idea. Unless you have some sort of utility that comes with the array (like the amutil command for the FC60), the only other chance is with STM:

xstm/mstm: Select: Tools > Exper Tool > Run
then select: Utilities > Flash Component Lights > Drive | LUN | Disk Enclosure | Array


Pete

[Tim D Fulford]

...Hmmm... I'm not sure about this as I use VA's, FC60 & JBODs normally.... but you need to count in base 8 (roughly)

cXtd would correspond to LUN a*8+b eg
cXt2d3 would be 2*8+3 ==> LUN 19

Unfortunately I THINK you are limited to 32 devices per controller (may well be wring here), so cXt3d7 would be LUN31 (including LUN0 is 32)

Regards

Tim

[Geoff Wild]

In EMC, there is a syminq command - I'm sure that HDS has something like that.

Shows:
Device Product Device
----------------------- --------- --------------------- -------------------
Name Type Vendor ID Rev Ser Num Cap (KB)
----------------------- --------- --------------------- -------------------

/dev/rdsk/c0t6d0 HP 36.4G ST336752LC HP02 3ET0FPZ1 35566480
/dev/rdsk/c3t6d0 HP 36.4G ST336752LC HP02 3ET0FQNS 35566480
/dev/rdsk/c4t0d0 EMC SYMMETRIX 5568 15000000 7680
/dev/rdsk/c4t1d0 R1 EMC SYMMETRIX 5568 15101000 8838720

Under the serial num, 15101000 means "frame" 15, LUN 101.

Don't know if that helps....

Rgds...Geoff