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04-04-2007 08:03 PM
04-04-2007 08:03 PM
iSCSI targets assigned from NAS
Problem is regarding iSCSI target which is from NAS.
I have assigned a target to my pSeries AIX 5.3 Server. For this to work, I mentioned the target name in "/etc/iscsi/targets" file in the format ---
After that, I executed the command --
# cfgmgr -l iscsi0
I then configured iSCSI Protocol Device. Soon after performing this, I was able to see a new disk appearing.
# lspv
Then I executed the command --
# chdev -l hdiskn -a pv=yes (to assign PVID)
I also created a new volume group (newvg) and assigned this disk to it. Finally created filesystem on that disk using the command --
# crfs -v jfs -g newvg -m /test -A yes -a size= -a bf=true
# mount -a
The filesystem got mounted and was able to use it further.
BUT.......
after sometime, I see that the PV becomes inaccessible and while issuing the command --
# lsvg newvg
i get an error message.
I then restarted the server and then I couldn't even see the PV. I had to issue the command --
# cfgmgr
after which the disk appeared with no PVID assigned to it.
When I issue the command ---
# chdev -l hdisk2 -a pv=yes
it gives me an error message which is --
Method error (/usr/lib/methods/chgdisk):
0514-047 Cannot access a device.
pv
While the disks are visible ---
-bash-3.00# lspv
hdisk0 00c7f38ba17b240f rootvg active
hdisk1 00c7f38be92d85ad rootvg active
hdisk2 none None
hdisk3 none None
-bash-3.00#
After I restart the server for 4-5 times, the iSCSI LUNs become invisible or the "hdiskn" is different/other than the one which was present earlier.
Kindly suggest what steps do I need to follow and why it is happening like that.
What other points do I need to consider and how can I get my problem resolved.
OR
What is the correct way to get the iSCSI LUNs and then assign to a VG and then create a filesystem.
TIA
Atul Gautam
I have assigned a target to my pSeries AIX 5.3 Server. For this to work, I mentioned the target name in "/etc/iscsi/targets" file in the format ---
After that, I executed the command --
# cfgmgr -l iscsi0
I then configured iSCSI Protocol Device. Soon after performing this, I was able to see a new disk appearing.
# lspv
Then I executed the command --
# chdev -l hdiskn -a pv=yes (to assign PVID)
I also created a new volume group (newvg) and assigned this disk to it. Finally created filesystem on that disk using the command --
# crfs -v jfs -g newvg -m /test -A yes -a size=
# mount -a
The filesystem got mounted and was able to use it further.
BUT.......
after sometime, I see that the PV becomes inaccessible and while issuing the command --
# lsvg newvg
i get an error message.
I then restarted the server and then I couldn't even see the PV. I had to issue the command --
# cfgmgr
after which the disk appeared with no PVID assigned to it.
When I issue the command ---
# chdev -l hdisk2 -a pv=yes
it gives me an error message which is --
Method error (/usr/lib/methods/chgdisk):
0514-047 Cannot access a device.
pv
While the disks are visible ---
-bash-3.00# lspv
hdisk0 00c7f38ba17b240f rootvg active
hdisk1 00c7f38be92d85ad rootvg active
hdisk2 none None
hdisk3 none None
-bash-3.00#
After I restart the server for 4-5 times, the iSCSI LUNs become invisible or the "hdiskn" is different/other than the one which was present earlier.
Kindly suggest what steps do I need to follow and why it is happening like that.
What other points do I need to consider and how can I get my problem resolved.
OR
What is the correct way to get the iSCSI LUNs and then assign to a VG and then create a filesystem.
TIA
Atul Gautam
1 REPLY 1
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04-04-2007 09:14 PM
04-04-2007 09:14 PM
Re: iSCSI targets assigned from NAS
Closing this thread as it was started in "Disk array" section rather than "NAS".
Will post is again in the respective section.
ATUL
Will post is again in the respective section.
ATUL
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