topic Re: Multipathing in Operating System - HP-UX

Multipathing

zsujith — Fri, 08 Aug 2008 00:30:57 GMT

Hello,

In HPUX/SUN which command is there to check the SAN disk multipathing.

Regards

Re: Multipathing

Steven E. Protter — Fri, 08 Aug 2008 01:19:14 GMT

Shalom,

HP-UX has ioscan and fcmsutil

I don't know sun, never heard of HPUX/SUN having anything in common other than maybe System V roots.

Can't help with that.

SAN might have some tools too.

SEP

Re: Multipathing

zsujith — Fri, 08 Aug 2008 03:23:14 GMT

Hi,

How to find out for alternate link are they using HDLM.

Regards

Re: Multipathing

rariasn — Fri, 08 Aug 2008 10:56:21 GMT

Hi,

http://docs.sun.com/app/docs/doc/816-5166/mpathadm-1m?a=view

rgs.

Re: Multipathing

Debakanta Biswal — Tue, 12 Aug 2008 06:02:34 GMT

If you have VxVM installed .Then you can see the multi path using the command vxdisk list |grep numpath

otherwise:-
vxdmpadm getsubpaths dmpnodename=

Re: Multipathing

Matti_Kurkela — Tue, 12 Aug 2008 08:35:57 GMT

HDLM seems to be Hitachi's multipath I/O load balancing software, like HP's SecurePath and EMC's PowerPath.
(Disclaimer: I have never had a chance to use HDLM, so I don't know much about it.)

HP-UX supports multipathing without any extra software, but to get load balancing between the paths, you'll need HP-UX 11.31 or SAN-manufacturer-specific multipath software like PowerPath, SecurePath or HDLM.

Basic checks of the HP-UX OS-level multipathing:
If you use LVM, you can confirm that a disk has been configured with multiple paths by using the "vgdisplay -v " command and verifying that all the SAN-attached physical disks have alternate paths defined.
If you use VxVM, see Debakanta's answer.

Then use "ioscan -fnkCdisk" and make sure that the all the listed disk paths are in CLAIMED state. NO_HW would indicate that the path has worked in the past but is not working now.

SecurePath and PowerPath integrate fairly well with this basic mechanism of HP-UX, but HDLM might do things differently: check Hitachi's HDLM documentation.

MK

Re: Multipathing

zsujith — Thu, 14 Aug 2008 04:26:03 GMT

Thanks guys