topic ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY in Operating System - HP-UX

ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

gunners — Wed, 27 Jul 2011 09:40:43 GMT

Hi,

I have a quick question. I have an RP4410 Server running hp/ux 11.11 Operating system , and an external storage disk device MSA30.

I am adding new disks tomorrow to the MSA30 , and as they are plug in direct , does the Operating system see them instantly ? or do I have to run a command on the unix side to actually pick them up as 'physical disks'

Thanks a mill

Dave

Re: ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

Pete Randall — Wed, 27 Jul 2011 11:25:46 GMT

Ioscan should pick them up right away.

Re: ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

gunners — Wed, 27 Jul 2011 11:39:24 GMT

Cheers Pete,

so literally just 'ioscan' without any switches or qualifiers ?

Dave

Re: ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

Pete Randall — Wed, 27 Jul 2011 11:50:59 GMT

Cheers to you, too!

Full syntax should be "ioscan -fnCdisk", though you could certainly leave off "Cdisk" if you don't mind wading through all the extra output.

Re: ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

Arunabha Banerjee — Wed, 27 Jul 2011 15:44:47 GMT

Before running the ioscan just take the output # ls -ltr /dev/rdsk/ | tail -10. So that after running the ioscan you can easily notice the new disk device file. If still you are not able to see the new disk then run # insf -eC disk command.

Re: ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

Patrick Wallek — Wed, 27 Jul 2011 16:40:07 GMT

You will probably also need to tell the system to create the device files for the disks. You do this with the 'insf' command.

The procedure I usually follow:

ioscan -fnC disk ---> This makes sure that the new disks are accessible by the OS.

insf -C disk ---> Creates the device files for the disks

ioscan -fnC disk ---> This will show the device files that were just created for the new disks.

Re: ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

Doug O'Leary — Wed, 27 Jul 2011 17:36:58 GMT

Hey;

I believe it was stated above, but just to be clear: you need two commands:

ioscan -fnC disk # rescans the bus

insf -eC disk # create the new device drivers.

Hope that helps.

Doug

Re: ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

Torsten. — Wed, 27 Jul 2011 17:38:17 GMT

It depends ...

Is the MSA30 connected to a plain SCSI controller or a smart array controller (e.g. sa6400)?

"ioscan -fn" will tell you.

Procedure depends on this!

Re: ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

gunners — Thu, 28 Jul 2011 05:25:48 GMT

OK , thats great , just have one more question here , If I add two new disks , and I want to make them 'raided' (i think is the phrase) , so if one goes bang , the other keeps the data intact , and we just need to replace it and it builds itself back into the two disk set , how do i configure this ?

Re: ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

Torsten. — Thu, 28 Jul 2011 05:40:57 GMT

For this functionality you need a smartarray controller installed in the server. You can configure RAID1 or RAID5 on the disks. In case of a disk failure just replace the disk - done.

Otherwise you can mirror the disks with LVM, but you need to do adjustments after a disk replacement.

Please show your

# ioscan -fn

Re: ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

gunners — Thu, 28 Jul 2011 10:17:37 GMT

Hmmm , not sure i understand whats happened - see below - I have physically installed 4 disks - 2 on each side of the MSA30 , bu it looks like nothing has changed ? :S

dubhptst: # ls -ltr /dev/rdsk/ | tail -10
total 0
crw-r--r--   1 bin        sys        188 0x000000 Jun 22 2007 c0t0d0
crw-r--r--   1 bin        sys        188 0x040000 Jul 27 2009 c4t0d0
crw-r--r--   1 bin        sys        188 0x040100 Jul 27 2009 c4t0d1
crw-r--r--   1 bin        sys        188 0x020000 Sep 14 2009 c2t0d0
crw-r--r--   1 bin        sys        188 0x021000 Sep 14 2009 c2t1d0
dubhptst: # ioscan -fnC disk
Class     I H/W Path       Driver   S/W State   H/W Type     Description
==========================================================================
disk      0 0/0/3/0.0.0.0 sdisk    CLAIMED     DEVICE       TEAC    DV-28E-N
                           /dev/dsk/c0t0d0   /dev/rdsk/c0t0d0
disk      1 0/1/1/0.0.0    sdisk    CLAIMED     DEVICE       HP 73.4GMBA3073NC
                           /dev/dsk/c2t0d0   /dev/rdsk/c2t0d0
disk      2 0/1/1/0.1.0    sdisk    CLAIMED     DEVICE       HP 73.4GST373454LC
                           /dev/dsk/c2t1d0   /dev/rdsk/c2t1d0
disk      3 0/6/1/0/4/0.0.0 sdisk    CLAIMED     DEVICE       HP      LOGICAL
VOLUME
                           /dev/dsk/c4t0d0   /dev/rdsk/c4t0d0
disk      4 0/6/1/0/4/0.0.1 sdisk    CLAIMED     DEVICE       HP      LOGICAL
VOLUME
                           /dev/dsk/c4t0d1   /dev/rdsk/c4t0d1
dubhptst: # insf -eC disk
insf: Installing special files for sdisk instance 0 address 0/0/3/0.0.0.0
insf: Installing special files for sdisk instance 1 address 0/1/1/0.0.0
insf: Installing special files for sdisk instance 2 address 0/1/1/0.1.0
insf: Installing special files for sdisk instance 3 address 0/6/1/0/4/0.0.0
insf: Installing special files for sdisk instance 4 address 0/6/1/0/4/0.0.1
dubhptst: # ls -ltr /dev/rdsk/ | tail -10
total 0
crw-r-----   1 bin        sys        188 0x000000 Jun 22 2007 c0t0d0
crw-r-----   1 bin        sys        188 0x040000 Jul 27 2009 c4t0d0
crw-r-----   1 bin        sys        188 0x040100 Jul 27 2009 c4t0d1
crw-r-----   1 bin        sys        188 0x020000 Sep 14 2009 c2t0d0
crw-r-----   1 bin        sys        188 0x021000 Sep 14 2009 c2t1d0
dubhptst: #

Re: ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

gunners — Thu, 28 Jul 2011 13:20:21 GMT

Hi just an addition , I think Im learning more as I go along here , would I be right in thinking that if I have added in two disks on each side of the MSA30 Disk unit , that they would show up as 'additional space' on the devices that already exist - so in other words see below from 'SAM' extract of disk devices , the additional space would show up on vg01 and vg02 below. If this is t rue then it has not happened

0/0/3/0.0.0.0     1          Unused   --              0   DVD-ROM Drive ( ^ │
││ 0/1/1/0.0.0       1          LVM      vg00        70007   HP 73.4GMBA3073   │
││ 0/1/1/0.1.0       1          LVM      vg00        70007   HP 73.4GST37345   │
││ 0/6/1/0/4/0.0.0   1          LVM      vg01       138920   HP      LOGICAL   │
││ 0/6/1/0/4/0.0.1   1          LVM      vg02       138920   HP      LOGICAL   │

Re: ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

Torsten. — Sat, 30 Jul 2011 11:17:28 GMT

"LOGICAL VOLUME" indicates you are using a smart array controller.

Use ioscan to find the controller device, e.g.

# ioscan -fnCciss

and get the information

saconfig /dev/ciss1

the use saconfig to configure the new disks.

Re: ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

gunners — Mon, 01 Aug 2011 14:23:37 GMT

Hi there Torsten , ok I ran those commands , is this what I should expect to come back as the response?

the ioscan just came back to the unix prompt

dubhptst: # ioscan -fnCciss
dubhptst: # saconfig /dev/ciss1

saconfig (/dev/ciss1): Error - File open failed
saconfig (/dev/ciss1): No such file or directory, errno=2

SmartArray RAID device files (/dev/cissX) found using "/usr/sbin/ioscan -kfnd
ciss":

Class     I H/W Path     Driver   S/W State   H/W Type     Description
========================================================================
ext_bus   4 0/6/1/0/4/0 ciss     CLAIMED     INTERFACE    PCI-X SmartArray 640
2 RAID Controller
                         /dev/ciss4

Run "sautil run_startup_script" if you suspect that the device file is missing
or corrupted.
dubhptst: #

Re: ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

Torsten. — Mon, 01 Aug 2011 17:00:43 GMT

Run

# sautil /dev/ciss4

# saconfig /dev/ciss4

and post.

Re: ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

gunners — Tue, 02 Aug 2011 17:46:35 GMT

Hi Torsten , I attach notepad file with extracts of above

Re: ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

Torsten. — Tue, 02 Aug 2011 17:57:12 GMT

Let's see what we have:

1 MSA30 with DB module

2 logical drives in RAID5 (138920 MB each)

6 assigned disks

4 unassigned (new) disks

Now you have several options:

extend the existing RAIDs

-> extend the existing logical drives

-> create new logical drives on the existing RAIDs

create 1 or more new RAIDs with new logical drives

What is your goal?

Re: ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

gunners — Tue, 02 Aug 2011 20:20:11 GMT

Ok Torsten ,

Thanks again for coming back to me

Right , Literally I just want to see more disk space on the current environment. So when I go into 'sam' I want to see the additional diskspace I have added , coming up on vg01 and vg02 and thus I can extent my filesystems as they grow in the future as we may be doing disk to disk backups , so I guess its the 'extend the existing RAIDs' option is what I want from your question below

Now you have several options:

extend the existing RAIDs

-> extend the existing logical drives

-> create new logical drives on the existing RAIDs

create 1 or more new RAIDs with new logical drives

What is your goal?

Re: ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

chris huys_4 — Wed, 03 Aug 2011 01:14:08 GMT

you will need first to check if the existing volumegroups, were you want the luns to be increased from, would be able to "accept" the increased lunsize.

I.e.

# vgdisplay /dev/vg01

# vgdisplay /dev/vg02

And its the product of "max PV per PE * PE size" , which will determine, the maximum size of any lun within that volumegroup. (and no, you dont want to play with vgmodify on hp-ux 11.11)

Re: ADDING NEW DISK CAPACITY FROM O/S LEVEL QUERY

Torsten. — Wed, 03 Aug 2011 06:05:52 GMT

I would do the following:

- check with vgdisplay the maximum values for the VGs

- create a new RAID5 on the 6 new disks (see man saconfig)

- create 2 (or more) logical drives on the RAID

- add them to the existing VGs

- vgextend the VG's

- lvextend or lvcreate the LVOLs

- extend or create the file systems

- done