topic Re: Mirrors and High Availability in Operating System - HP-UX

Mirrors and High Availability

Alex Almaraz — Fri, 18 Aug 2006 08:59:36 GMT

Hi there Gurus,

I need to know if the HP-UX servers we manage have a Mirror for the OS File Systems. I opened the SAM and it says Mirror Copies = 1 in the "Disks and File Systems item" (/var, /, etc.)
I suppose this is what I am finding,

do you have some commands to see more detailed information about? How to see if the other File Systems have a Raid 5 or Mirror?

Best regards

Re: Mirrors and High Availability

nanan — Fri, 18 Aug 2006 09:01:39 GMT

Hi Alex

Use vgdisplay -v vg00 and lvdisplay -v /dev/vg00/lvols

you can see the information you want

Regards
nanan

Re: Mirrors and High Availability

Pete Randall — Fri, 18 Aug 2006 09:05:43 GMT

Doing lvdisplay on the logical volume containing the file system in question will give you the definitive answer:

# lvdisplay /dev/vg00/lvol9
--- Logical volumes ---
LV Name /dev/vg00/lvol9
VG Name /dev/vg00
LV Permission read/write
LV Status available/syncd
Mirror copies 1

-etc-

However, if you are using a SAN or some sort of array, you may well have hardware mirroring and the only way to get info on that depends on what utility your array uses.

Pete

Re: Mirrors and High Availability

IT_2007 — Fri, 18 Aug 2006 09:06:17 GMT

You will know it by running lvdisplay -v /dev/vg??/lvol??? and it will look like this:

--- Logical volumes ---
LV Name /dev/vg00/lvol8
VG Name /dev/vg00
LV Permission read/write
LV Status available/syncd
Mirror copies 1
Consistency Recovery MWC
Schedule parallel
LV Size (Mbytes) 4704
Current LE 294
Allocated PE 588
Stripes 0
Stripe Size (Kbytes) 0
Bad block on
Allocation strict
IO Timeout (Seconds) default

Re: Mirrors and High Availability

Steven E. Protter — Fri, 18 Aug 2006 09:06:24 GMT

Shalom,

lvlnboot -V

vgdisplayh -v vg00

lvdisplay -v the logical volumes within.

SEP

Re: Mirrors and High Availability

Alex Almaraz — Fri, 18 Aug 2006 14:05:07 GMT

Guys,

Is this the same command to look for RAID 5 devices on FS? or what do I need to execute for this purpose?

Regards

Re: Mirrors and High Availability

Pupil_1 — Fri, 18 Aug 2006 14:20:54 GMT

do can ioscan -funC disk.
You should be able to make out from this o/p about the raid level !!

Re: Mirrors and High Availability

Patrick Wallek — Fri, 18 Aug 2006 14:25:10 GMT

HP-UX LVM can NOT do any RAID5. If you have a disk array, then that would be done at the array level.

You would have to check the disk array itself to see whether or not it is doing RAID5.

The command to do this will depend entirely on the type of array you have.

Re: Mirrors and High Availability

Alex Almaraz — Wed, 30 Aug 2006 14:27:24 GMT

Thanks for all your responses.

Regards