VG on Shared Disks

[Danial2000]

Hi All
I would like to thanks every one for valuable information that thay offer.
I have a shared disks between two systems and I want to know if there is any precautions that i need to take care of?..and if any one can giud me to aite that contains books talking about those things
Thanks for all
Danial

 

[mkharris]

Are you talking about SSA disks? If so, it's worth starting at the IBM SSA faq:

http://www.storage.ibm.com/hardsoft/products/ssa/faq.html

Also have a browse through the redbooks collection:

http://publib-b.boulder.ibm.com/Redbooks.nsf/redbooks/

Mark

 

[Danial2000]

Thanx Mark
I am using SSA disks and those disks are shared between two using systems.
What i want to know is : what are the precautions that may affect my implementations and i want a site that talking about the shared ssa disks but not the virtual shared disks.

Danial

 

[bjverzal]

Be default, if an SSA disk is active on system A (volume group is varied on), the other disks will not be able to access that disk.

I have 64 SSA disks shared among 5 servers. We have no problems.

Bill.

 

[bjverzal]

Be default, if an SSA disk is active on system A (volume group is varied on), the other systems (system B) will not be able to access that disk.

I have 64 SSA disks shared among 5 servers. We have no problems.

Bill.

 

[bi]

Danial,

Even though AIX tries to prevent you from stepping all over yourself, I would recommend having a diagram of the disks in the drawer showing which system is using the disks, which volume group the disks are in, how each system sees the disks (both pdisk number and hdisk number), etc. It helps to have something like this if something goes wrong with one of the disks.

Familiarize yourself with the addressing of the disks in the drawer, be sure to label the cables (both ends!) as to which system and which drawer and connection on the drawer they are attached to.

 

[bjverzal]

Geeze - is my typing bad today

Let's try once more...my post should say:

By default, if an SSA disk is active on system A (volume group is varied on), the other systems (system B) will not be able to access that disk.

I have 64 SSA disks shared among 5 servers. We have no problems.

Bill.

 

[Danial2000]

Hi All
Thanx for all of you.
Bi i need your e-mail so that i can e-mail you my configuration
Bill could you recommend some documentation about this issue.
Thanx all
Danial.

 

[bjverzal]

http://www.storage.ibm.com/hardsoft/products/ssa/

This is the IBM SSA site. It has been moved off the Hursley site.

Consider using "Visio" for documenting the SSA loops.

Bill.

 

[bi]

Danial,

Try this address: bi_tektip@bellsouth.net