topic Re: Raid on disk in Operating System - HP-UX

Raid on disk

cscoglio — Thu, 02 Jun 2011 11:46:38 GMT

As i see the type of RAID in the configuration of the disk...

Thanks

Re: Raid on disk

Duncan Edmonstone — Tue, 29 Jun 2021 05:17:15 GMT

well RAID can be done in a disk array, via a RAID controller, or using a volume manager (such as LVM, VxVM, or for Oracle, ASM).

So the first question is which of these are you trying to look at? You posted in the LVM and VxVM category, so I'll ass-u-me LVM?

LVM supports only mirroring, so no RAID 5 to worry about. Just run an "lvdisplay" on the relevant lvol, and it will tell you if it is mirrored:

# lvdisplay /dev/vg00/lvol1
--- Logical volumes ---
LV Name /dev/vg00/lvol1
VG Name /dev/vg00
LV Permission read/write
LV Status available/syncd
Mirror copies 0
Consistency Recovery MWC
Schedule parallel
LV Size (Mbytes) 300
Current LE 75
Allocated PE 75
Stripes 0
Stripe Size (Kbytes) 0
Bad block off
Allocation strict/contiguous
IO Timeout (Seconds) default

In my case, the lvol isn't mirrored (Mirror copies = 0)

If you want to know more, or something different you will have to be more specific...

HTH

Duncan

Re: Raid on disk

cscoglio — Thu, 02 Jun 2011 14:12:38 GMT

ok, but i need the command for review at the assigned physical disk.

Thanks!

Re: Raid on disk

Steven E. Protter — Thu, 02 Jun 2011 14:22:21 GMT

Shalom,

Could be hardware raid you know.

model

Please post.

Most modern HP-UX servers ship with hardware raid which is invisible to the OS. If you have PSP for HP-UX installed, you can see this configuration.

SEP

Re: Raid on disk

cscoglio — Thu, 02 Jun 2011 14:25:26 GMT

Blade 870C OS: hp-ux 11.31

Re: Raid on disk

Duncan Edmonstone — Thu, 02 Jun 2011 16:26:57 GMT

Well the first thing to determine is the type of disks that the OS is seeing - whole physical disks, or some sort of RAID'd LUN...

post the output of:

ioscan -funC disk

HTH

Duncan

Re: Raid on disk

cscoglio — Thu, 02 Jun 2011 16:34:33 GMT