topic Create Mirror Disk in Operating System - HP-UX

Create Mirror Disk

Gurcharan Sahota_2 — Wed, 22 Feb 2006 09:01:16 GMT

We have a HP rx2600 server and I need to create a root mirror disk.

We have 2 disks - HP 36.4Gb 15K. The mirror disk must be bootable.

How do i go about creating it?

Re: Create Mirror Disk

Peter Godron — Wed, 22 Feb 2006 09:05:14 GMT

Gurcharn,
have you got the additional HP_UX Mirror product ?
If it is installed, just change the number of mirrors on the area you want to mirror.
I use SAM for this, nice and easy.

Re: Create Mirror Disk

Bharat Katkar — Wed, 22 Feb 2006 09:08:40 GMT

Hi,
See attached doc.

Regards,

Re: Create Mirror Disk

Doug Burton — Wed, 22 Feb 2006 09:08:42 GMT

Mirror the ROOT disk
Reference HP Doc ID: LVMKBRC00005103

Mirror root disk to a second disk drive while making sure the second drive is bootable.
I am going to assume that c2t2d0 is the main bootable drive and c1t2d0 will be our second, mirrored bootable drive we need to build.
The "-B" option is used to create a bootable Physical Volume: pvcreate -B /dev/rdsk/c1t2d0
Make sure to use the character device file when using mkboot: mkboot -l /dev/rdsk/c1t2d0
Make sure disks are not in a quorum.
The "-lq" indicates no quorum when two disks are used. When three or more are used you don't need "-lq". You also need to do this with the primary disk. Otherwise, when you boot normally to "pri" and the "alt" disk is not there for whatever reason, you will **NOT** be able to boot. The "pri" disk will "look" for the "alt" disk. No quorum???? To bad so sad, you loose. Ack!
So do this:

mkboot -a "hpux -lq (;0)/stand/vmunix" /dev/rdsk/c1t2d0

Don't forget the main boot drive:
mkboot -a "hpux -lq (;0)/stand/vmunix" /dev/rdsk/c2t2d0

Add Diag to lif:
32 Bit:
mkboot -b /usr/sbin/diag/lif/updatediaglif -p ISL -p AUTO -p HPUX -p PAD -p LABEL /dev/rdsk/c1t2d0

64 Bit:
mkboot -b /usr/sbin/diag/lif/updatediaglif2 -p ISL -p AUTO -p HPUX -p PAD -p LABEL /dev/rdsk/c1t2d0

Check the contents of the AUTO file:
lifls /dev/rdsk/c1t2d0 or this command: lifcp /dev/rdsk/c1t2d0:AUTO -

Add the Physical Volume to the root volume group:
vgextend /dev/vg00 /dev/dsk/c1t2d0

Do this next command for each "lvol"......
lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/c1t2d0

******* or *******
for x in lvol1 lvol2 lvol3 lvol4 lvol5 lvol6 lvol7 lvol8
do
echo "\n******** Doing ${x} ********\n"
lvextend -m 1 /dev/vg00/${x} /dev/dsk/c1t2d0
done ; banner All Done

Don't forget any extra swap you added (like /dev/vg00/swap2). Do "swapinfo" and "bdf" to check for swap and any other lvols that may have been created.
Specify the root logical volume: lvlnboot -r /dev/vg00/lvol3
Specify the swap logical volume: lvlnboot -s /dev/vg00/lvol2
Specify the dump logical volume: lvlnboot -d /dev/vg00/lvol2
Specify the boot logical volume: lvlnboot -b /dev/vg00/lvol1
Recover any BDRA info: lvlnboot -R
Verify boot, root, swap and dump settings: lvlnboot -v
Display the Primary and Alternate boot paths that are currently set: setboot
Set alternate boot path to the new mirrored disk.
Use "ioscan -funC disk" to find out what the path should be:
setboot -a 0/0/1/1.2.0
Activate AutoSearch and AutoBoot: setboot -s on -b on
Run "setboot" again to confirm the change.
Do "shutdown -r 0" (or "reboot") to test. After halting the boot process, type in "bo alt" to boot from the alternate disk.
A good test would be to remove the primary and then boot to the alternate drive. After that test, place the primary back into the server, then remove the alternate to check that booting process as well. The server should boot from either the primary or alternate disk if no quorum was properly set.

Re: Create Mirror Disk

Patrick Wallek — Wed, 22 Feb 2006 09:13:02 GMT

Since you have an rx2600, which is an Itanium machine, the above 2 procedures will NOT work for you. The procedure for Itanium is quite different.

Check out the following document in the knowledge base:

Title: How to mirror vg00 using LVM on IA with 11.23
Document ID: KBRC00014526
http://www2.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000082066576

Re: Create Mirror Disk

Torsten. — Wed, 22 Feb 2006 10:11:14 GMT

I never used SAM to create a root mirror, but don't try the procedures above. This will create a mirror, but NOT a bootable one.

Follow Patricks suggestion!

Notice, the first step (idisk) is necessary to create partitions,

EFI (boot) cxtydzs1
OS cxtydzs2
Diag cxtydzs3

You see the difference: the appended s1, s2, s3 to the "normal" devicefile.

Re: Create Mirror Disk

Luk Vandenbussche — Wed, 22 Feb 2006 10:13:16 GMT

Hi,

The procedure from Patrick is the valid for integrity servers running HPUX

Re: Create Mirror Disk

Doug Burton — Wed, 22 Feb 2006 10:29:11 GMT

Yep - sorry about that. The info I gave was for a Risc box. I didn't know an rx2600 was an Itanium box. Should have checked first.

Re: Create Mirror Disk

Geoff Wild — Wed, 22 Feb 2006 10:46:52 GMT

Here's it is as I just did it for my rx2600:

(couldn't embed - so I attached it...

Rgds...Geoff

Re: Create Mirror Disk

Gurcharan Sahota_2 — Wed, 22 Feb 2006 11:27:27 GMT

This is the ioscan from the server;

The boot disk already has an 's' number appended to it, what does it signify and why are there 3 separate entries for it?

Re: Create Mirror Disk

Torsten. — Wed, 22 Feb 2006 11:36:38 GMT

Read my previous post again!

Re: Create Mirror Disk

Senthil Kumar .A_1 — Wed, 22 Feb 2006 12:19:56 GMT

Hi Gurucharan,

Basically, in the itanium boxes, we have a different boot loader as opposed to PDC, called EFI(Extensible Firmware interface). This is a "fat" partition.

"idisk" utility helps you create 3 slices namely "cxtxdxs1(EFI),cxtxdxs2(OS),cxtxdxs3(Diag)".

If you feel the already create slices are not upto the doc standards ,submitted by Walleck,

just "rmsf" the s1,s2,s3 of second disk, and follow the link provided by patrick walleck.

The Doc is spot on for Itanium box, I used the same doc, in one of the rx2600 and even booted from the second disk successfully, without any issue's.

Best of luck and enjoy the exciting procedure.

Regards,
Senthil

Re: Create Mirror Disk

Gurcharan Sahota_2 — Wed, 22 Feb 2006 12:38:16 GMT

thanks for your responses everyone, i'm in the process of working my way thru the document and I'll let you know how I get on.

Re: Create Mirror Disk

Indrajit_1 — Wed, 22 Feb 2006 19:04:04 GMT

Hi;

Do the following steps..

#vgdisplay -v vg00 |more

See the out put, if the alternet disk is present. Both the disk should similar in size.
Now..

#lvextend -m 1 /dev/vg00/lvol1
it take some time to complete the mirror
do it for all the LVs.
Now..
#mkboot -a "hpux -lq"
#setboot (see the output)
(use "setboot -p" & "setboot -a" interms of change the boot order.

Cheers
indrajit

Re: Create Mirror Disk

Gurcharan Sahota_2 — Thu, 23 Feb 2006 05:39:28 GMT

Hit a slight problem, whilst in the process of intializing the LVM partition (s2) and adding it to vg00, I encountered the following error-

root@bduxdv01:/> vgextend vg00 /dev/dsk/c2t1d0s2
vgextend: Warning: Max_PE_per_PV for the volume group (4238) too small for this
PV (4329).
Using only 4238 PEs from this physical volume.
Volume group "vg00" has been successfully extended.
vgcfgbackup: Invalid LVMREC on Physical Volume /dev/rdsk/c2t1d0

any suggestions?

Re: Create Mirror Disk

Muthukumar_5 — Thu, 23 Feb 2006 05:45:42 GMT

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=942766

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=841931

--
Muthu

Re: Create Mirror Disk

Devender Khatana — Thu, 23 Feb 2006 06:16:16 GMT

Hi,

Here is the official disk replacement guide describing root-mirroring for itanium systems in HPUx at page 26.

http://docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad.pdf

HTH,
Devender

Re: Create Mirror Disk

Gurcharan Sahota_2 — Thu, 23 Feb 2006 08:46:05 GMT

In the process of lvextending vg00 and copying across all the lvols to the mirror disk but have encountered the following error -

lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/c2t1d0s2
Usage: lvextend
[-A Autobackup]
{-l LogicalExtentsNumber |
-L LogicalVolumeSize}
LogicalVolumePath [ PhysicalVolumePath... | PhysicalVolumeGroupName... ]
"m": Illegal option

I've read that I need to have the MirrorDisk product installed? the PA-RISC version is different from the itanium based version? is it downloadable or does it have to be paid for? are there any other workarounds?

Re: Create Mirror Disk

Patrick Wallek — Thu, 23 Feb 2006 09:44:08 GMT

Yes, you have to buy Mirror Disk in order to use it.

Yes, Itanium version is different from PA-RISC version.

Workarounds? None that I know of.

Re: Create Mirror Disk

Geoff Wild — Thu, 23 Feb 2006 12:17:08 GMT

If you have the Enterprise OE (or Mission Critical)- then mirror disk is included - sounds like you have Foundation OE:

swlist |grep OE

You will have to purchase a license for Mirrordisk UX

Rgds...Geoff