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Disks in XP arrays

 
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Ninad_1
Honored Contributor

Disks in XP arrays

Hi All,

I have xpinfo output for one of the XP256 arrays connected to a HP-UX 11.00 server.
Sample displayed below (Only relevant fields displayed)
/dev/rdsk/c33t0d0 XP256 CL2A 00:00 14014 RAID1 1-1
/dev/rdsk/c53t0d1 XP256 CL1A 00:02 14014 RAID1 1-1
/dev/rdsk/c33t0d2 XP256 CL2A 00:04 14014 RAID1 1-1
/dev/rdsk/c53t0d3 XP256 CL1A 00:06 14014 RAID1 1-2
/dev/rdsk/c33t0d4 XP256 CL2A 00:08 14014 RAID1 1-2
/dev/rdsk/c53t0d5 XP256 CL1A 00:0a 14014 RAID1 1-3
/dev/rdsk/c33t0d6 XP256 CL2A 00:0c 14014 RAID1 1-3
/dev/rdsk/c53t0d7 XP256 CL1A 00:0e 14014 RAID1 1-3
/dev/rdsk/c33t1d0 XP256 CL2A 00:10 14014 RAID1 1-4
/dev/rdsk/c53t1d1 XP256 CL1A 00:12 14014 RAID1 1-4
/dev/rdsk/c13t0d0 XP256 CL1E 00:14 14014 RAID1 1-5
/dev/rdsk/c73t0d1 XP256 CL2E 00:16 14014 RAID1 1-5
/dev/rdsk/c13t0d2 XP256 CL1E 00:18 14014 RAID1 1-5

Raid grp Disk Mechs
1-1 R107 R117 --- ---
1-2 R127 R137 --- ---
1-3 R100 R110 --- ---
1-4 R120 R130 --- ---
1-5 R106 R116 --- ---

Now my questions are
1. Are the disks shown in Disk Mechs correspond to actual physical disks in XP array ?
2. Why is it that the alternate disk groups are having 2 and 3 CU:LDEVs - why not same number ?

I am aware command view is used to get info on XP arrays and only the LUNs made visible to the server are visible through xpinfo. But I do not have access to command view - with this limitation can anyone please provide help on the queries.
The disks are 36 GB disks and each LUN is OPEN-8*2 (14014 MB).
Please let me know if anything else is requried.

Thanks,
Ninad Date
14 REPLIES 14
Alzhy
Honored Contributor

Re: Disks in XP arrays

1.) Yes xpinfo is quite accurate but it should match the firmware code on your XP.. only latest xpinfo though can understand 7+1P or 4+2P configs.

2.) That's how your LUNs were presented.. ask your storage admin.

Hakuna Matata.
Ninad_1
Honored Contributor

Re: Disks in XP arrays

Nelson,

Thanks for your guidance.
Only one thing - I had read somewhere that the 7+1P or ... are available with latest firmware for XP1024 , but not for XP256.
Please can you confirm.

Thanks,
Ninad
Peter Mattei
Honored Contributor

Re: Disks in XP arrays

Yes you are right!
RAID5 (7&1) is supported starting with XP128 / XP1024 and of course the XP1000 / XP12000.

Your configuration:
RAID Group 1-1 is RAID1 and consists of physical disks R107 and R117.
It presents 3 LUNs of 14GB to your HP-UX server:
/dev/rdsk/c33t0d0 XP256 CL2A 00:00 14014 RAID1 1-1
/dev/rdsk/c53t0d1 XP256 CL1A 00:02 14014 RAID1 1-1
/dev/rdsk/c33t0d2 XP256 CL2A 00:04 14014 RAID1 1-1

Easy as that
Peter
I love storage
Ninad_1
Honored Contributor

Re: Disks in XP arrays

Peter,

Yes it seems as simple as you explained. But what I am not able to understand is that why the alternate raid-groups are having 2 and 3 CU:LDEVs ? why not 3 in all raid groups or why not 2 in all raid groups ?
Also as per my understanding 36 GB disks are used. If you use 36 GB disks in a RAID1 we will have 36 GB usage apce in which I can create 2* 14GB LDEVs and still have 8 GB space unused. Also I cannot have 3 * 14 GB LDEVs in a raid group using 2 disks and RAID1. So how are 3 LDEVs possible in one RAID group ?
The only way I can see is that if I can combine 2 raid groups then I can have 5 LDEVs of 14 GB amongst them thus only then it may be possible to see 2 LDEVs in one raid group and 3 LDEVs in next raid group. But then how does the xpinfo show the disk mechs as being different for both the raid groups - one raid group should show all the 4 disks as it is spanning across disks - if this is possible at all in the first place.

Please can anyone help on the above. How does it all work in reality. I have not worked on XP arrays, I am trying to check if any disks are unused and can be made available to be shifted to some other array.

Thanks a lot,
Ninad
Ninad_1
Honored Contributor

Re: Disks in XP arrays

Hi,

Any help please.

Thanks,
Ninad
Ninad_1
Honored Contributor

Re: Disks in XP arrays

Hi Gurus,

Any help please .

Thanks,
Ninad Date
Peter Mattei
Honored Contributor

Re: Disks in XP arrays

Hi Ninad
I was out yesterday!

Well, I can actually not fully understand your configuration!
Can you provide a serial number of your XP256? I need the last 5 digits.
I can then have a look at your HW configuration in the HP database.

I assume your LUNs are not equal.

Cheers
Peter
I love storage
Ninad_1
Honored Contributor

Re: Disks in XP arrays

Hi Peter,

Thanks a lot.
The serial no - last 5 digits is 55289 for the XP256 array.
Please let me know, If you want I can provide the full xpinfo output as well.

Thanks very much,
Ninad
Peter Mattei
Honored Contributor
Solution

Re: Disks in XP arrays

Ah, I see
Your 36GB Disk Groups each are configured with 5x Open-8

Group 1-1 look like that
CU-LDEV 0-00 0-01 0-02 0-03 0-04
Group 1-2 look like that
CU-LDEV 0-05 0-06 0-07 0-08 0-09

In your XPINFO output above you only see the staring LDEV of a LUSE.
It looks like your LUSEs consist of
LDEV --------- Disk Group
0-00 + 0-01 -- 1-1
0-02 + 0-03 -- 1-1
0-04 + 0-05 -- 1-1 and 1-2
0-06 + 0-07 -- 1-2
0-08 + 0-09 -- 1-2
etc.

I hope this clears it up!

Cheers
Peter
I love storage