Ds4800 on HP

[Slawek Ksiazek]

How can i set (scsimgr) disk witch i have from DS4800 on hpux 11.31 (I have connection trough fabric)Please help me.Thanks

Slawek

[TTr · Accepted solution]

The DS4800 is an active/passive array aka as "dual active". Officially it is not supported on 11.31 but being active/passive it would not work with the new DSF devices. You should use legasy DSF devices with PVlinks. Is this related to the slowness that you mention in your other question?

[Slawek Ksiazek]

How can i set disk in mode active/passive?

[TTr]

> How can i set disk in mode active/passive?

Not sure what you are asking. You should see two disk paths for each LUN, for example for LUN0 you would see cXt0d0, cYt0d0. One is always the primary and the other is always the alternate. Use the SMdevices utility to determine which is primary and which is alternate. Then you create your volume groups with the two paths as usually. If you need more details you have to tell me what you have done so far with in the array and the server.

[Slawek Ksiazek]

Hi

Please forgive me my english,now I have situation where I see in my system two lun
from DS

bash-3.2# ioscan -fnC disk |grep IBM
...
disk 39 0/0/2/1/0.1.27.0.0.0.0 sdisk CLAIMED DEVICE IBM 1815 FAStT
disk 40 0/0/2/1/0.1.27.0.0.0.1 sdisk CLAIMED DEVICE IBM 1815 FAStT
disk 34 0/0/2/1/1.1.27.0.0.0.0 sdisk CLAIMED DEVICE IBM 1815 FAStT
disk 36 0/0/2/1/1.1.27.0.0.0.1 sdisk CLAIMED DEVICE IBM 1815 FAStT


this are two lun (50GB) (i see trough two path )

ioscan -m dsf
...
/dev/rdisk/disk57 /dev/rdsk/c16t0d0
/dev/rdsk/c14t0d0
/dev/rdisk/disk58 /dev/rdsk/c16t0d1
/dev/rdsk/c14t0d1



Witch software is necessary?

[TTr]

OK, the two device pairs are
LUN0: c16t0d0, c14t0d0
LUN1: c16t0d1, c14t0d1

Normally on the DS4800, one LUN would be owned by controller A and the other by controller B. Right?

You need to install the IBM storage manager software on the server so that you know if controller A on the DS4800 corresponds to c16 or c14 server paths. Same for controller B. The software is on
http://www-304.ibm.com/systems/support/supportsite.wss/selectproduct?taskind=2&brandind=5000028&familyind=5329626&typeind=0&modelind=0&osind=0&psid=sr&continue.x=1&matrix=Y#Storage%20Manager

What firmware is on the DS4800?

[Slawek Ksiazek]

what I can do after instalation SM?

[TTr]

Run the SMdevices command. It is harmless, it creates a listing of the LUNs with the controller ownership and UNIX device files. Run it as "SMdevices > smdev.txt". Then look at the smdev.txt file. It is very easy to understand it. Look at the lines that say "Preferred Path" for each LUN. The UNIX device files in these lines are the primary paths that you have to use in vgcreate.

ONE IMPORTANT NOTE

When you use the pvcreate command, only use it on the preferred/primary path of each LUN. If you use it with the alternate path, the DS4800 will change controller ownership. If this happens then you need to go in the DS4800 and change the controller ownership back to the prefered controller.