MSA1000 - expanding the array to create more LUNs

[EU-Admins-UNIX]

Hi

I have an MSA1000 attached to an RP8420 running HP-UX 11.31.

The MSA1000 has 42 146GB disks (40 data and 2 spare).

data

disk101 - disk114

disk201 - disk214

disk301 - disk312

spare

disk313 - disk314

We have 3GB space left.

Total Space On Array = 1406271 MB
Total Space Used On Array = 1402762 MB
Free Space On Array = 3509 MB
The maximum size of a volume with the specified raid level is 1749MB.
Not enough physical space available for the volume.

I have replaced the 12 146GB disks disk301 - disk312 with 300GB disks and they have been recognised in the show disks output, as have the 2 new 300GB spares

Disk301 3,01 3,00 300.0 GB 160 MB/s 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22
Disk302 3,02 3,01 300.0 GB 160 MB/s 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22
Disk303 3,03 3,02 300.0 GB 160 MB/s 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22
Disk304 3,04 3,03 300.0 GB 160 MB/s 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22
Disk305 3,05 3,04 300.0 GB 160 MB/s 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22
Disk306 3,06 3,05 300.0 GB 160 MB/s 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22
Disk307 3,07 3,08 300.0 GB 160 MB/s 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22
Disk308 3,08 3,09 300.0 GB 160 MB/s 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22
Disk309 3,09 3,10 300.0 GB 160 MB/s 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22
Disk310 3,10 3,11 300.0 GB 160 MB/s 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22
Disk311 3,11 3,12 300.0 GB 160 MB/s 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22
Disk312 3,12 3,13 300.0 GB 160 MB/s 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22
Disk313 3,13 3,14 300.0 GB 160 MB/s 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22 (spare)
Disk314 3,14 3,15 300.0 GB 160 MB/s 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22 (spare)

My question is how do I make these replacement larger disks usable, as mentioned before I only have abuyt 3GB left and would like to create some more LUNs to extend some VG's as, afaik, one cannot extend LUN's on HP-UX dynamically using MSA1000 CLI extend unit command.

Regards

Tariq

[Torsten.]

Question is, extending the existing LUNs on the array or create new LUNs?

The LVM can work with LUN extension.

[EU-Admins-UNIX]

Basically I want to first of all find out how to introduce the new capacity into the array, then use the space.

I was wondering if it was possible to extend the current LUNs whilst they are used in LVM.  Is this possible? 

Are there any restrictions on dynamic LUN extension?

Regards

Tariq

[Torsten.]

I did this long long time ago with a MSA1000. AFAIR you can use the CLI to either extend the LUNs or create new LUNs. On the HP-UX side you can use "vgmodify" to adjust the growing LUN.

[EU-Admins-UNIX]

Sorry Torsten, maybe I wasn't clear.

The initial problem I am having is that I am unable to use the extra capacity put into the array.  Even after putting in the 300GB disks, I am still being told I only have 3GB left avaiable.

Hope this helps.

Regards

Tariq

[adelgado]

I've just replaced and expanded 3 146GB disk array with 6 300 GB Disk on a MSA1000.

To do so, I first remove the LUN's and Array that was set with two 72GB disk from array B, then, I replace one by one of the 3 146 Gb of Array B. Once replaced those 3 disks, I expanded the array, and recognized me the new capacity. Finally, I add the last 2 300 Gb, and once again expanded array B, to the full capacity.

As I was running out of space on file server, and was the one that has assigned the LUN of array B, I extended the LUN for the capacity I desired.

Now I still have 700 Gb available to assign.

Regards,

[EU-Admins-UNIX]

Hi All

Maybe I've not made this clear, so I apologise if I haven't.

One large RAID group was created across all 42 x 146GB disks.  LUNs were created across all the physical disks upon which LV's and FS's were created.  2 x 146GB disks remained spare.

I replaced the 14 x 146GB disks in the 3rd tray with 14 x 300GB disks (12 data and 2 spare).  The MSA rebuild onto the new disks, and the 12 x 300GB became part of the 1 big RAID group.

Now there is spare capacity, how do I utilise this new capacity?  For example, I have a 500GB LUN with a VG, LV & FS built on it.  Now I have extra space, I would like to create, eg, a 100GB LUN and add it to the above VG etc to increase the LV to 600GB.

Is this possible without having to rebuild the array from scratch?

Regards

Tariq

[Torsten.]

Do you have all the expected new available space now?

As said, you may now create new LUNs or extend the existing LUNs, this is up to you. For the CLI syntax you may need to read the manual - I can't remember it exactly now...

[Torsten.]

This should help:

http://h10032.www1.hp.com/ctg/Manual/c01183955.pdf

HP StorageWorks
1000/1500 Modular Smart Array Command Line
Interface user guide


see "expanding an array" and "extending a LUN"

[EU-Admins-UNIX]

Hi Torsten

msa> add unit 21 data="DISK101-DISK114 DISK201-DISK214 DISK301-DISK312" spare="DISK313-DISK314" raid_level=1 stripe_size=128 size=100gb
Total Space On Array = 1406271 MB
Total Space Used On Array = 1402762 MB
Free Space On Array = 3509 MB
The maximum size of a volume with the specified raid level is 1749MB.
Not enough physical space available for the volume.

I'm still only showing 3GB available.  Surely I musy have more than that available.

Regards

Tariq