shared disk visibility

[Jino PV]

Hi everyone,

I have a simple query. I do have 4 node cluster. How to check if all the disks are visible to all the nodes from HPUX? I don't have the EMC software installed in it.


Regards,

Jino

[Jeeshan]

Hi

Run
#ioscan -fnC disk

[Rajeev Shukla]

One manual way would be to take a ioscan output of all the 4 nodes and then compare it with the LUN configuration you have done on the Storage (if you want all the LUNS configured on the storage to be visible to all nodes then you should have a exact count of the LUN/disks seen by each host)

Run diskinfo or cstm on each of the disks on the system and verify the size and serial numbers as seen from each system to make sure they are all seen.

[Jino PV]

Hi Ahsan,

ioscan will not help me as some disks are visible to 2 nodes and some are visible to 3 nodes or some disks are visible to all nodes. Some packages are configured to run on any 2 nodes or some packages are cnfigured to run on 3 nodes also. So I cannot rely on ioscan output.

Also getting the diskinfo for each everydisk may not be the right solution as it will take such a long time to complete in a 4 node cluster with 100s of disks.

[SUDHAKAR_18]

Hi Jino,

I hope U have Navisphere GUI to monitor EMC storage.
have U assigned Lun(shared) to all of your cluster nodes ? Check from storage GUI.

why can't U purchase atleast a eval copy of EMC powerpath ?

Regards,
SHR

[Rasheed Tamton]

Hi Jino,

If you do not have powerpath, just check whether you have syminq (inq_hpux) installed on your system or not. You can just copy the file from any other system. The path might be /usr/symcli/bin/syminq

Inq will give the serial no. of the LUNs so that you would be able to compare from all the nodes.

Regards,
Rasheed Tamton.

[Nguyen Anh Tien]

Regardless of EMC, Please check:
1, If you have enable Zoning in sanswitch
2, Please check SSP of your storage.
3, Do "ioscan -fnC disk" command at HPUX host

let me know which storage yo use ?? (MSA, VA, or EVA...)
Do you have connection topology?

[johnsonpk]

Hi Jino,

Syminq would be the better option in you scenario ..

Thanks !!
Johnson

[Jino PV]

Hi all,

I have already told that emc software is not installed in the system. But the suggestion from Rasheed to copy the syminq works, then that may help me.
But I was searching purely from the OS side.

[sreekanthtm]

Hi,

In SAN environement, each LUN will have its own LUN ID, through which we can identify the disk. The LUN ID is totaly depends on the storage not the OS. So if the EMC/HP/IBM s/w OR utility is not installed in ur server its not possible to identify, weather the disk visible from Server A is the same disk that is visible from server B or any other node....

Rgds
Sreekanth