MSA30 Mirror

[Macho_2]

I have 4 physical disk attached to my HP MSA30. I want mirror the disk such as 2+2. Each of my disk size is 72GB x 4. So basically I am going to used only 144GB disk of space and the balance should be mirrored.


Please provide me step by step to configure the disk mirror.

[Torsten.]

What is your OS?

Any RAID controller in play?

[Rob Leadbeater]

Hi,

As Torsten says it depends on what the MSA30 is connected to...

The MSA30 is just a SCSI disk shelf. It doesn't have any RAID functionality built in to it. If it's connected to a ProLiant, then you would normally setup the RAID on a SmartArray controller...

Hope this helps,

Regards,

Rob

[Macho_2]

Hi;

The MSA30 attach to the HPUX server version HPUX 11.23.

[Torsten.]

Run ioscan -fnCdisk to get the device files.

What I/O module is installed (SB/DB/MI)?

In case of dual busses, I would install 2 disks in each half of the MSA30 and connect to different HBAs.

Now you may use SAM to create VG's and LV's - mirror them to the other half of the chassis.

If you provide the output of

strings /etc/lvmtab
and
ioscan -fn

we can help you further.

[Macho_2]

Hi;

Attached is the info as your request. Please guide me.

[mmax]

hi Macho

you have to crate PV for LVM
#pvcreate /dev/dsk/c4t0d0
#pvcreate /dev/dsk/c4t1d0
#pvcreate /dev/dsk/c5t0d0
#pvcreate /dev/dsk/c5t1d0

after you have to create VG and LV
#vgcreate vgdata /dev/dsk/c4t0d0 /dev/dsk/c4t1d0 /dev/dsk/c5t0d0 /dev/dsk/c5t1d0

after that you have to create LV on which you can create FS
#lvcreate -l 0 -n lvname1 vgdata
#lvcreate -l 0 -n lvname2 vgdata

extend LV to the right size

#lvextend -L SIZEinMB /dev/vgdata/lvname1 /dev/dsk/c4t0d0
#lvextend -L SIZEinMB /dev/vgdata/lvname2 /dev/dsk/c4t1d0

and create mirro to 2nd disk
#lvextend -m 1 /dev/vgdata/lvname1 /dev/dsk/c5t0d0
#lvextend -m 1 /dev/vgdata/lvname2 /dev/dsk/c5t1d0

at the end you have to create FS
#mkfs -F vxfs /dev/vgdata/lvname1
#mkfs -F vxfs /dev/vgdata/lvname2
and after that all you have 2 FS ready for use
regards
Michal

[Torsten.]

I was not able to send it earlier due to network problems.


You don't answered the question about the I/O module, but I assume it is a dual bus.

Here are your device files:

/dev/dsk/c4t0d0
/dev/dsk/c4t1d0

/dev/dsk/c5t0d0
/dev/dsk/c5t1d0

Now we create a new VG (vg01).

# mkdir /dev/vg01
# mknod /dev/vg01/group c 64 0x010000
# pvcreate /dev/dsk/c4t0d0
# pvcreate /dev/dsk/c4t1d0

# pvcreate /dev/dsk/c5t0d0
# pvcreate /dev/dsk/c5t1d0
(next line is single line)
# vgcreate vg01 /dev/dsk/c4t0d0 /dev/dsk/c4t1d0 /dev/dsk/c5t0d0 /dev/dsk/c5t1d0

Now we have all 4 disks in vg01.

next step: create an zero sized lvol (lvol1):

# lvcreate vg01

Now we extend the LVOL to a size of 5gig to the first disk:

# lvextend -L 5000 /dev/vg01/lvol1 /dev/dsk/c4t0d0

finally mirror it:

# lvextend -m 1 /dev/vg01/lvol1 /dev/dsk/c5t0d0

Create a filesystem:
# newfs -F vxfs /dev/vg01/rlvol1

mount it:
# mkdir /my_new_mount_point
# mount /dev/vg01/lvol1 /my_new_mount_point

This is how it works, adjust the values as needed.

[Macho_2]

The steps the you all provide to me is not very clear. Basically I want to create vg01 with the c4t0d0 & c4t1d0. After that I want mirror the vg01 with the c5t0d0 and c5t1d0.
Under vg01 , I want to create logical volume from lvol1 to lvol8.

Note : Each of the disk size is 72GB.End of the day, I just want to see total disk size is 144GB and another 144GB is just mirror.

Please guide me how to do this .

[Torsten.]

Follow the steps!

Mirroring works on LVOL level - not on disk level!