topic Re: Strange problem with mirroring in Operating System - HP-UX

Strange problem with mirroring

Dario_4 — Thu, 07 Feb 2002 09:01:03 GMT

Hello admins,
I've a strange problem during the mirror of disks.
Basically I have 4 disk : 0/6/0 (boot disk), 0/2/0,0/5/0, 0/4/0 and I wuold like to mirror these disks on 1/2/0, 1/5/0, 1/4/0. The boot disk works fine, with the command ftadd.
First of all I create the pv.

pvcreate /dev/rdsk/c1t2d0
pvcreate /dev/rdsk/c1t5d0
pvcreate /dev/rdsk/c1t4d0

But it doesn't create the pv, (also with the options -f).

Someone can suggest me the right way for mirror these disks?

Thanks

Re: Strange problem with mirroring

Thierry Poels_1 — Thu, 07 Feb 2002 09:11:36 GMT

Hi,

warning: 1/2/0, 1/5/0, 1/4/0 do NOT necessarily reflect to /dev/rdsk/c1t2d0, /dev/rdsk/c1t5d0 and /dev/rdsk/c1t4d0 !!
Maybe you could use SAM to add the disk to the desired Volume Group.

good luck,
Thierry.

Re: Strange problem with mirroring

Dario_4 — Thu, 07 Feb 2002 09:17:42 GMT

Sure,
but from my point of view, it depends from another thing.

root@ [/]
#pvcreate /dev/rdsk/c1t2d0

root@ [/]
#pvcreate /dev/rdsk/c1t4d0
Physical volume "/dev/rdsk/c1t4d0" has been successfully created.

root@ [/]
#pvcreate /dev/rdsk/c1t5d0

root@ [/]
#vgextend /dev/vg01 /dev/dsk/c1t2d0 /dev/dsk/c1t4d0 /dev/dsk/c1t5d0
vgextend: Couldn't open physical volume "/dev/dsk/c1t2d0":
I/O error

Re: Strange problem with mirroring

Mark van Hassel — Thu, 07 Feb 2002 09:19:24 GMT

Hi,

Check the output of ioscan -funCdisk to see what the raw device files are for the hardware paths you specified.

Re: Strange problem with mirroring

ian Dennison — Thu, 07 Feb 2002 09:22:23 GMT

lssf /dev/dsk/c1t2d3 will give the Address of the Disk.

What does a 'diskinfo' tell you?

Share and Enjoy! Ian

Re: Strange problem with mirroring

Steven Sim Kok Leong — Thu, 07 Feb 2002 09:26:24 GMT

Hi,

/dev/dsk/c1t2d0 is usually generated for use by the CD-ROM drive during OS default installation. Please verify from your ioscan output that you are addressing the correct device files for your harddisks.

Hope this helps. Regards.

Steven Sim Kok Leong

Re: Strange problem with mirroring

Printaporn_1 — Thu, 07 Feb 2002 09:29:06 GMT

Hi,
Follow this:
Creating Mirrors of Root Logical Volumes
It is highly recommended that you use mirrored root volumes on all
cluster nodes. The following procedure assumes that you are using
separate boot and root volumes; you create a mirror of the boot volume
(/dev/vg00/lvol1), root volume (/dev/vg00/lvol3), and primary swap
(/dev/vg00/lvol2). The procedure cannot be carried out with SAM. In this
example and in the following commands, /dev/dsk/c4t5d0 is the primary
disk and /dev/dsk/c4t6d0 is the mirror; be sure to use the correct device
file names for the root disks on your system.
1. Create a bootable LVM disk to be used for the mirror.
# pvcreate -B /dev/rdsk/c4t6d0
2. Add this disk to the current root volume group.
# vgextend /dev/vg00 /dev/dsk/c4t6d0
3. Make the new disk a boot disk.
# mkboot /dev/rdsk/c4t6d0
4. Copy the correct AUTO file into the new LIF area.
# mkboot -a "hpux -l q (;0)/vmunix" /dev/rdsk/c4t6d0
5. Mirror the boot, root and primary swap logical volumes to the new
bootable disk. Ensure that all devices in vg00, such as /usr, /swap,
etc., are mirrored.
The following is an example of mirroring the boot logical volume:
# lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/c4t6d0
The following is an example of mirroring the root logical volume:
# lvextend -m 1 /dev/vg00/lvol3 /dev/dsk/c4t6d0
The following is an example of mirroring the primary swap logical
volume:
# lvextend -m 1 /dev/vg00/lvol2 /dev/dsk/c4t6d0
6. Update the boot information contained in the BDRA for the mirror
copies of boot, root and primary swap.
# /usr/sbin/lvlnboot -b /dev/vg00/lvol1
# /usr/sbin/lvlnboot -v -r /dev/vg00/lvol3
# /usr/sbin/lvlnboot -s /dev/vg00/lvol2
7. Check if the BDRA is correct.
# /usr/sbin/lvlnboot -R /dev/vg00
8. Verify that the mirrors were properly created.
# lvlnboot -v
The output of this command is shown in a display like the following:
Boot Definitions for Volume Group /dev/vg00:
Physical Volumes belonging in Root Volume Group:
/dev/dsk/c4t5d0 (10/0.5.0) Boot Disk
/dev/dsk/c4t6d0 (10/0.6.0) Boot Disk
Boot: lvol1 on: /dev/dsk/c4t5d0
/dev/dsk/c4t6d0
Root: lvol3 on: /dev/dsk/c4t5d0
/dev/dsk/c4t6d0
Swap: lvol2 on: /dev/dsk/c4t5d0
/dev/dsk/c4t6d0
Dump: lvol2 on: /dev/dsk/c4t6d0, 0

Re: Strange problem with mirroring

Michael Tully — Thu, 07 Feb 2002 09:29:11 GMT

It sounds liks there is a problem with this disk /dev/dsk/c1t2d0

Please post the results of diskinfo /dev/rdsk/c1t2d0
and ioscan -fnkC disk

-Michael

Re: Strange problem with mirroring

Stefan Farrelly — Thu, 07 Feb 2002 09:29:26 GMT

If you cant pvcreate -f a disk then almost always only one of 2 problems;

1. its a hardware problem - your server cant see the disk properly. Check all cables, hardware etc.
2. The disk in question is in use on another server or already on your server - thus even a pvcreate -f will fail. Check your disks very carefully to be sure youre not trying to overwrite a disk in use already.

Re: Strange problem with mirroring

Dario_4 — Thu, 07 Feb 2002 09:32:12 GMT

ioscan -funC disk works fine. I see 8 disks.

root [/]
#pvcreate /dev/rdsk/c1t2d0

root [/]
#pvcreate /dev/rdsk/c1t4d0
Physical volume "/dev/rdsk/c1t4d0" has been successfully created.

root@ [/]
#pvcreate /dev/rdsk/c1t5d0

root@TESTBED4 [/]
#vgextend /dev/vg01 /dev/dsk/c1t2d0 /dev/dsk/c1t4d0 /dev/dsk/c1t5d0
vgextend: Couldn't open physical volume "/dev/dsk/c1t2d0":
I/O error

root@ [/]
#pvremove /dev/rdsk/c1t4d0
The physical volume associated with "/dev/rdsk/c1t4d0" has been removed.

root@ [/]
#pvremove /dev/rdsk/c1t2d0
pvremove: Physical Volume "/dev/rdsk/c1t2d0" contains no LVM information

root@ [/]
#pvremove /dev/rdsk/c1t5d0
pvremove: Physical Volume "/dev/rdsk/c1t5d0" contains no LVM information

Re: Strange problem with mirroring

Steven Sim Kok Leong — Thu, 07 Feb 2002 09:36:36 GMT

Hi,

Would you mind showing us the output of ioscan -fnCdisk?

Hope this helps. Regards.

Steven Sim Kok Leong

Re: Strange problem with mirroring

Steven Sim Kok Leong — Thu, 07 Feb 2002 09:42:28 GMT

Hi,

Note that the cdrom also shows up in the ioscan -fnCdisk output.

Just be careful not to mistook the cdrom device file (on many systems it is /dev/dsk/c1t2d0) as a harddisk device file.

Hope this helps. Regards.

Steven Sim Kok Leong

Re: Strange problem with mirroring

Dario_4 — Thu, 07 Feb 2002 09:43:26 GMT

#diskinfo /dev/rdsk/c1t2d0
SCSI describe of /dev/rdsk/c1t2d0:
vendor: SEAGATE
product id: ST118273WC
type: direct access
size: 0 Kbytes
bytes per sector: 0

#diskinfo /dev/rdsk/c1t4d0
SCSI describe of /dev/rdsk/c1t4d0:
vendor: SEAGATE
product id: ST118273WC
type: direct access
size: 17783240 Kbytes
bytes per sector: 512

#diskinfo /dev/rdsk/c1t5d0
SCSI describe of /dev/rdsk/c1t5d0:
vendor: SEAGATE
product id: ST118273WC
type: direct access
size: 0 Kbytes
bytes per sector: 0

Re: Strange problem with mirroring

Dario_4 — Thu, 07 Feb 2002 09:44:56 GMT

#ioscan -funC disk
Class I H/W Path Driver S/W State H/W Type Description
======================================================================
disk 0 14/0/0.2.0 sdisk CLAIMED DEVICE SEAGATE ST118273WC
/dev/dsk/c0t2d0 /dev/rdsk/c0t2d0
disk 1 14/0/0.4.0 sdisk CLAIMED DEVICE SEAGATE ST118273WC
/dev/dsk/c0t4d0 /dev/rdsk/c0t4d0
disk 2 14/0/0.5.0 sdisk CLAIMED DEVICE SEAGATE ST118273WC
/dev/dsk/c0t5d0 /dev/rdsk/c0t5d0
disk 3 14/0/0.6.0 sdisk CLAIMED DEVICE SEAGATE ST118273WC
/dev/dsk/c0t6d0 /dev/rdsk/c0t6d0
disk 8 14/0/1.2.0 sdisk CLAIMED DEVICE SEAGATE ST118273WC
/dev/dsk/c1t2d0 /dev/rdsk/c1t2d0
disk 9 14/0/1.4.0 sdisk CLAIMED DEVICE SEAGATE ST118273WC
/dev/dsk/c1t4d0 /dev/rdsk/c1t4d0
disk 10 14/0/1.5.0 sdisk CLAIMED DEVICE SEAGATE ST118273WC
/dev/dsk/c1t5d0 /dev/rdsk/c1t5d0
disk 6 14/0/1.6.0 sdisk CLAIMED DEVICE SEAGATE ST118273WC
/dev/dsk/c1t6d0 /dev/rdsk/c1t6d0
disk 4 14/0/2.4.0 sdisk CLAIMED DEVICE TOSHIBA CD-ROM XM-6401TA
/dev/dsk/c2t4d0 /dev/rdsk/c2t4d0

Re: Strange problem with mirroring

ian Dennison — Thu, 07 Feb 2002 09:46:07 GMT

Are you using a Storage Array of some description?

I know the XP512 shows all c?t?d0 Disks as part of a bug in the security software. The 0 Size is a dead giveaway!

Share and Enjoy! Ian

Re: Strange problem with mirroring

Steven Sim Kok Leong — Thu, 07 Feb 2002 09:47:03 GMT

Hi,

The sizes are 0 Kbytes for /dev/rdsk/c1t2d0 and /dev/rdsk/c1t5d0.

Perhaps you would want to try recreating the device files.

# rmsf /dev/rdsk/c1t2d0
# insf -e

Hope this helps. Regards.

Steven Sim Kok Lenog

Re: Strange problem with mirroring

Mark van Hassel — Thu, 07 Feb 2002 09:52:33 GMT

Is STM installed ? If so run the diagnose utility on the two disks that have a 0 size.

Re: Strange problem with mirroring

Michael Tully — Thu, 07 Feb 2002 09:54:12 GMT

I've seen this problem before where
part of an autoraid will create a
device with zero size available.
This will explain whay you can't use
it. The disk could be displaying as
it might just be the spare disk under
RAID 5 for the array.

Re: Strange problem with mirroring

Dario_4 — Thu, 07 Feb 2002 11:00:40 GMT

Steven (and alls),
with the command

# rmsf /dev/rdsk/c1t2d0
# insf -e

I see the disk at 0 yet.

#diskinfo /dev/rdsk/c1t5d0
SCSI describe of /dev/rdsk/c1t5d0:
vendor: SEAGATE
product id: ST118273WC
type: direct access
size: 0 Kbytes
bytes per sector: 0

Also for 1.4.0 and 1.5.0

Re: Strange problem with mirroring

ian Dennison — Thu, 07 Feb 2002 11:25:58 GMT

From your last posting, now all 3 disks are showing up as Zero size? Ouch!

This might help the process of elimination

1. Latest SCSI cumulative patch? swlist -l product |grep -i scsi

2. Check SCSI IDs on the Enclosure Units? Swap around cables and try again? What chance for a reboot of the Server?

3. Are you plugging F/W Scsi cables into a 16 bit differential SCSI Board? Is the SCSI Connection on the Main Motherboard or a separate Card? Do you have the most up-to-date drivers for the Card, installed and in the kernel?

Share and Enjoy! Ian