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Re: Disk unused

 
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Eli Daniel
Super Advisor

Disk unused

good morning, before commenting on something I would like to wish you a happy new year.
wanted to know if any of you can help me for a command which are the disks that are unsed (EMC).
according to my supervisor multiple disks found unsed, but they are.
ioscan command with the disk can see the disks but how do I know if they are unused?
21 REPLIES 21
James R. Ferguson
Acclaimed Contributor

Re: Disk unused

Hi Eli:

Documentation is the only sure way to know if a physical disk is "used" or not.

Consider that you can 'vgexport' a volume group. The physical disk aren't "used" by the server, but they could be 'vgimport'ed elsewhere.

Next, a physical disk might be used as a raw device.

From a SAN perspective, a physical disk might not be assigned to any server, but it could still contain valuable data.

Documentation is critical.

Regards!

...JRF...
rariasn
Honored Contributor

Re: Disk unused

Hi Eli,

# symvg list

rgs,
Eli Daniel
Super Advisor

Re: Disk unused

nnex send the unused disk image
Torsten.
Acclaimed Contributor

Re: Disk unused

JRF: Documentation is the only sure way to know if a physical disk is "used" or not.



Strongly agree!




Hope this helps!
Regards
Torsten.

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Torsten.
Acclaimed Contributor

Re: Disk unused

"unused" in your screenshot means no LVM or VxVM.



But could be used by database or virtual machines without a volume manager!

Hope this helps!
Regards
Torsten.

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TTr
Honored Contributor
Solution

Re: Disk unused

For the unused disks in your server I would check two things. One is if there are multiple paths involved. These LUNs may be in use on this server under a different path.

Second, if these LUNS are not used in this server, you need to unpresent them from this server in EMC. Then you need to check in EMC if these LUNs have been presented to another server and are being used there.

These have commands to cross reference EMC LUNs and HP-UX disks.

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1087725

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1290435
Eli Daniel
Super Advisor

Re: Disk unused

the disk image to a server belonging Virtual Partition. It means that the disk that is "unused" are being used by another machine, or are allocated without being used.
TTr
Honored Contributor

Re: Disk unused

> the disk image to a server belonging Virtual Partition

Nor sure what you are trying to say here. Is this server a virtual machine or do you have virtual machines in this server? Also as Torsten asked do you have databases that may be using raw volumes? (oracle, RAC, sybase etc)
Eli Daniel
Super Advisor

Re: Disk unused

this is a rx7640 server with 4 Virtual Partition. There are no Virtual Machine.

In the SAP server is installed, if any database but is assigned to another VG (LVM).