topic Re: Query about IR Volumes in Operating System - HP-UX

Query about IR Volumes

rsingh2140 — Thu, 23 Aug 2007 12:45:28 GMT

Hi All
I'm very new to HP-UX.
My server rx6600 have IR volume setup.
1. vgdisplay -v vg00 is showing 8 logical volumes created on c1t1d0s2 physical volume.
2. sasmgr get_info -D /dev/sasd0 -q raid is showing /dev/rdsk/c1t1d0 drive in raid 1.

3. Following is the output of ioscan -fnC disk:

disk 1 0/4/1/0.0.0.1.0 sdisk CLAIMED DEVICE HP IR Volume
/dev/dsk/c1t1d0 /dev/rdsk/c1t1d0
/dev/dsk/c1t1d0s1 /dev/rdsk/c1t1d0s1
/dev/dsk/c1t1d0s2 /dev/rdsk/c1t1d0s2
/dev/dsk/c1t1d0s3 /dev/rdsk/c1t1d0s3

My doubt is :
1. what are the c1t1d0s1 c1t1d0s2 and c1t0d0s3 entries in the ioscan output?
2. why the vgdisplay command is showing c1t1d0s2 as the physical volume. shouldn't it show c1t1d0 there?

Thanks alot in advance.
best regards!!!

Re: Query about IR Volumes

Torsten. — Thu, 23 Aug 2007 12:55:05 GMT

/dev/dsk/c1t1d0 is your integrated RAID disk.

This disk has partitions (normal for an Integrity boot disk). The "sx" stands for the partition number.

s1 ... EFI boot partition
s2 ... HP-UX partition
s3 ... HP Service partition

Re: Query about IR Volumes

Steven E. Protter — Thu, 23 Aug 2007 13:11:20 GMT

Shalom,

This setup is as a result of the proliant like hardware that ships in this system. I like hardware raid, it takes i/o off the system and gets it done without using normal OS resources.

c1t1d0s2 is showing as a physical volume because it is a partition not done by the OS but presented to the OS by the hardware. It is one physical disk, partitioned to have three sections.

In older systems without hardware raid the first and third partitions are on the boot disk and are not visible to the ioscan command like this.

In summary, just a new way HP decided to do things.

SEP

Re: Query about IR Volumes

rsingh2140 — Thu, 23 Aug 2007 13:22:14 GMT

Thanks alot!!..its pretty clear now.
Actually this is the first i have a HP-UX server, otherwise i was working on Sun.
As the system came pre installed, i want to try reinstalling HP-UX on the server so as to get an idea about installing it.So if i reinstall then will it ask me about the sizes of EFI boot, HP-UX and HP Service partition?
Also what are the default, recomended filsystems to be created and their default and recomended sizes?
I hope during installation i can create logical volumes as i have only 2 HDD on my system right now.

Please guide me..
thanks alot!!

Re: Query about IR Volumes

Torsten. — Thu, 23 Aug 2007 13:24:26 GMT

"In older systems without hardware raid the first and third partitions are on the boot disk and are not visible to the ioscan command like this."

Sorry, but this is not true.

The partitions are always visible. The IR is just a hardware mirror of a "normal" boot disk.

This is an example from a "normal" rx8620 - the boot disk:

disk 1 3/0/0/2/0.6.0 sdisk CLAIMED DEVICE HP 73.4GMAU307
3NC
/dev/dsk/c0t6d0 /dev/rdsk/c0t6d0
/dev/dsk/c0t6d0s1 /dev/rdsk/c0t6d0s1
/dev/dsk/c0t6d0s2 /dev/rdsk/c0t6d0s2
/dev/dsk/c0t6d0s3 /dev/rdsk/c0t6d0s3

SEP, do you already have an Integrity?

Re: Query about IR Volumes

Torsten. — Thu, 23 Aug 2007 13:36:01 GMT

additional info:

you can even access the EFI partition from HP-UX, start to read here:

http://docs.hp.com/en/B2355-60105/efi_ls.1M.html

To see a picture of the disk layout, see

Figure 3-1 Example LVM Disk Layout on an HP Integrity Server

on this link

http://docs.hp.com/en/5991-6481/ch03s04.html#cbddaicd

Re: Query about IR Volumes

rsingh2140 — Thu, 23 Aug 2007 13:42:57 GMT

Thanks!! alot Torsten..

Re: Query about IR Volumes

rsingh2140 — Thu, 23 Aug 2007 13:49:38 GMT

Re: Query about IR Volumes

Torsten. — Thu, 23 Aug 2007 13:51:14 GMT

>>So if i reinstall then will it ask me about the sizes of EFI boot, HP-UX and HP Service partition?

It does not ask, it is using the defaults.

>> Also what are the default, recomended filsystems to be created and their default and recomended sizes?

The installer will set the default sizes. It is up to you to change them.

>>I hope during installation i can create logical volumes as i have only 2 HDD on my system right now.

You can adjust the number and size of LVOL at installation time. You can also increase the size of most of the LVOLs and add new LVOLs later.