topic Re: PVLink in Operating System - HP-UX

PVLink

Shehan — Wed, 28 Nov 2007 04:54:28 GMT

Hi All

I am going to configure PVLink with EVA3K.Attached "vgdisplay" command output shows the status of the server volume groups.

Here vg00 for internal disks,vg01,vg02,vg03 and vg04 are for eva3k.

Please help me to configure this.

Thanks
Nirukshitha

Re: PVLink

Khairy — Wed, 28 Nov 2007 05:26:48 GMT

Hi,

more info are needed
ioscan -funC fc
ioscan -funC disk

if you're configuring disk from eva, make sure all the luns are configure as redundant. In this way, you will see more this in ioscan.

eg:
c1t1d0
c1t2d0
c4t1d0
c4t2d0

in this example, assuming c1t1d0 is the same disk with c4t1d0.

Perform the following command to check:
# echo "0x2008?4D" | adb /dev/dsk/c1t1d0

2008: 894960601 1067429315 94960601 1067430042

# echo "0x2008?4D" | adb /dev/dsk/c4t1d0

2008: 894960601 1067429315 94960601 1067430042

As you can see, its the same disk. Only the way hpux presents them as 2 disk.

If confirm, then exec vgextend.
# vgextend /dev/vgXX /dev/dsk/c4t1d0

It should be successful but be very careful. If c4t1d0 is different disk, it will be OVERWRITE/DESTROY. Always double check when execute the command above.

If successful, you can exec
# vgdisplay -v vgXX

and you check in 'physical volumes' section and u will notice 1 more link is added. Eg:

--- Physical volumes ---
PV Name /dev/dsk/c1t1d0
PV Name /dev/dsk/c4t1d0 Alternate Link
PV Status available
Total PE 17499
Free PE 17499
Autoswitch On

In this case, if should any of the fibre link fails (fibre cable/fibre adapter), vgXX will be still accessible.

Rgds

PS: pls don't forget to assign points. Good luck!

Re: PVLink

Shehan — Wed, 28 Nov 2007 06:12:04 GMT

Hi

Please see below command output
Class I H/W Path Driver S/W State H/W Type Description
==========================================================================
disk 0 0/0/3/0.0.0.0 sdisk CLAIMED DEVICE HL-DT-STDVD+RW GCA-4040N
/dev/dsk/c0t0d0 /dev/rdsk/c0t0d0
disk 1 0/1/1/0.0.0 sdisk CLAIMED DEVICE HP 73.4GMAU3073NC
/dev/dsk/c2t0d0 /dev/rdsk/c2t0d0
disk 2 0/1/1/0.1.0 sdisk CLAIMED DEVICE HP 73.4GMAU3073NC
/dev/dsk/c2t1d0 /dev/rdsk/c2t1d0
disk 3 255/255/0/0.0 sdisk CLAIMED DEVICE HSV100 HP
/dev/dsk/c20t0d0 /dev/rdsk/c20t0d0
disk 4 255/255/0/0.1 sdisk CLAIMED DEVICE HSV100 HP
/dev/dsk/c20t0d1 /dev/rdsk/c20t0d1
disk 5 255/255/0/0.2 sdisk CLAIMED DEVICE HSV100 HP
/dev/dsk/c20t0d2 /dev/rdsk/c20t0d2
disk 6 255/255/0/0.3 sdisk CLAIMED DEVICE HSV100 HP
/dev/dsk/c20t0d3 /dev/rdsk/c20t0d3

Re: PVLink

Torsten. — Wed, 28 Nov 2007 07:07:52 GMT

You cannot use pvlinks here.

I assume the EVA is still active/passive?

PVLINKS is working with active/active only.

But you are using secure path:

disk 6 255/255/0/0.3 sdisk CLAIMED DEVICE HSV100 HP
/dev/dsk/c20t0d3 /dev/rdsk/c20t0d3

The device file

255/255/0/0.3

clearly indicates this. No need to worry - all fine. ;-)

Re: PVLink

Shehan — Wed, 28 Nov 2007 07:19:45 GMT

Hi friend

Thanks for the information. You are correct. Secure path is already installed with active-passive mode. Problem is i will have to remove secure path because we are going to connect new eva8K to same server.It should be configured active -active.So I though to remove current secure path and planing to configure with pvlink.That is why we need to pvlink configuration.Do you have any though about this?

Regards
Nirukshitha

Re: PVLink

Torsten. — Wed, 28 Nov 2007 07:20:28 GMT

Try "spmgr display" to see more details.

You can also download and install "evainfo".

Re: PVLink

Torsten. — Wed, 28 Nov 2007 07:24:43 GMT

If you are still connected to the old EVA in active/passive mode, you **NEED** secure path.

The software can also handle active/active, but it is not needed.

Re: PVLink

Torsten. — Wed, 28 Nov 2007 07:25:29 GMT

If you are still connected to the old EVA in active/passive mode, you **NEED** secure path.

The software can also handle active/active, but it is not needed.

BTW, if you consider to upgrade the "old" to active/active, you can proceed to use secure path or uninstall it and use PVLINKS for both.

Re: PVLink

Shehan — Wed, 28 Nov 2007 07:36:02 GMT

Friend

We are using secure path 3.0D. This is not support with active-active.So I will have to upgrade it to 3.0F with active -active.

Is it possible to configure pvlink for new eva8k , without doing any changes for old eva3k. It means Old EVA3k is going with Secure path active-passive ,but new one is going with pvlink.is this possible?

Regards
Nirukshitha

Re: PVLink

HGN — Wed, 28 Nov 2007 08:44:03 GMT

Hi

Pleae read the forum guidelines in assigning points you have assigned point to just 1 out of the 79 responses for your various questions.

Rgds

HGN

Re: PVLink

Torsten. — Wed, 28 Nov 2007 10:30:19 GMT

IMHO you need to upgrade either the secure path version or the EVA firmware (EVA3000 to active/active) - you cannot use the old spmgr with bothe EVA.

BTW, please read

http://forums1.itrc.hp.com/service/forums/helptips.do?#33

Re: PVLink

Shehan — Wed, 28 Nov 2007 23:42:58 GMT

I want to keep old securpath version for eva3k & also need to configure pvlink for new eva8k.Is this possible?

Re: PVLink

Sagar Sirdesai — Tue, 11 Dec 2007 11:22:52 GMT

Hi Nirukshitha
yes it possible to keep secure path for eva3k and pvlinks for eva8k...

Just simple publish the luns from eva 8k .
if you want to identify the luns from eva8k( HSV 210 Controllers) .
use
ioscan -knfcdisk | grep "HSV 210"

You will have 8 paths for each lun.

Use any device path while creating the vg .
This will your primary path .
And then just extend the vg with the other 7 device path . This configuring the alternate paths .

Note : Do not do pvcreate for the other 7 device paths.

Hope this helps

if you want any example i can give it to you

Thanks

Sagar

Re: PVLink

Shehan — Tue, 11 Dec 2007 12:23:39 GMT

Hi Sagar
Much appreciate for the feedback. Please share an example with me.

Regards
Nirukshitha

Re: PVLink

avik — Mon, 17 Dec 2007 11:15:17 GMT

i ll create the vg with one of the disks from all available paths.

i ll do a

vgexport -s -m vg01.map vg01

then i ll do a vgimport after mkdir/mknod etc.

vgimport -s -m vg01.map vg01

now "strings /etc/lvmtab" shud be listing all multipathed device paths.

Re: PVLink

avik — Mon, 17 Dec 2007 12:36:56 GMT

btw, u still can hv securepth and autopath to manage both active/passive and active/active controllers in the same hpux machine.