SAN Boot for HPUX 11.23

[Natesan_1]

Hello we have

RX5670 Server connected thro EMC clarion CX600 SAN storage with dual FC card.(We have confirmed from EMC doc. that external boot of 11.23 supported on CX600 SAN box)

1.We wanted to install the OS on SAN LUN
2. But we would get multiple path thro both FC cards (due to dual Fc card and SP on Storage)

3. While install HPUX 11.23 it is taken only one path.

How to add the additional paths to the system I mean additional path to VG00?.
Since we wanted to check by booting thro additional paths too for achiving FC Card fail-over.

[Mark Grant]

Usual way to add the path is to just vgextend the volume group to include the new path. The system knows it's the same LUN.

I personally would feel a bit twitchy about booting off the SAN myself but I know some people do.

[Natesan_1]

Hi Mark,

Thanks for your reply. in hpux 11.23 has three slice of root disk, when u do vgextend do we required to do any thing special for making those slice to appear on alternath path?.

[Mark Grant]

Woa!

It looks like you are not using LVM but veritas instead. Apologies for this but am not entorely sure how you do this in this case!

[Natesan_1]

Hi Mark,

It is not VXVM, LVM on HPUX 11.23 (IPF)

[Bernhard Mueller]

Hi,

usually you would simply run vgextend for the device file of the alternate path e.g. being c#t#d#s2:
vgextend vg00 /dev/dsk/c#t#d#s2

This is for the default partitioning for LVM root disks and slice 2 being the HP-UX partition. Which should be the case if you install from DVD.

Then run vgdisplay -v vg00 and it will tell you "alternate path" for c#t#d#s2

You can also check lvlnboot -v.

Regards,
Bernhard

[Mark Grant]

Oh, in that case, no, you do not need to do anything special, it is all taken care of by the system.

[Natesan_1]

Hi Bernhard,

if we have dont' have the device file for alternate disk like cxtxdxs2. how we do extend?. or u can tell how can we create s2 device file.

[Mark Grant]

If you don't have the device paths but you can see them as "CLAIMED" with "ioscan" just do "insf -e -C disk" or if you're feeling nervous "insf -e -H "

[Bernhard Mueller]

Hi,

as Mark said you just need to do insf -e to create any missing device files.

If you reboot, this will also do an insf -e. Then you *should* see all your path to your SAN boot disk with all the different device files, e.g /dev/dsk/c4t0d1s2 and /dev/dsk/c6t0d1s2.

All other disks or LUNs should just have the /dev/dsk/c4t0d2 and c6t0d2 device files (without the "slice" addition).

Regards
Bernhard

[Natesan_1]

Hi All,

Thanks for your help, we are able see alternath path for root disk(lun)we extended the vg00 with alternate path.confirmed in the vgdisplay also.

Thanks for once again.

[D Block 2]

when you say, able to see alternative paths, can you explain what command you used ? Thanks.

[Natesan_1]

Tom,

When we rebooted the system, alternate path was able to see from system.

[Donny Jekels]

follow the root disk mirro process in detail.