RE: RAC - Configuring Disk Coordinator

[Matthew Zito]

Title: Message

 

 Whoops - I missed  a question in there.  Smallest lun possible?  On the older HDS thunder systems, you can make teeny-tiny luns - I'm guessing the 9570V is the same way.  Make a raid group and carve a few small luns out of it.

 

Matt

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Matthew Zito
GridApp Systems
Email: [EMAIL PROTECTED]
Cell: 646-220-3551
Phone: 212-358-8211 x 359
http://www.gridapp.com

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Matthew Zito
Sent: Friday, July 25, 2003 1:54 PM
To: Multiple recipients of list ORACLE-L
Subject: RE: RAC - Configuring Disk Coordinator

 

To answer your questions.....

 

1) Ideally, yes, though they don't need to be.

2) Absolutely.  Veritas will get very unhappy if it loses access to those disks

3) SCSI-3 Persistent Reservation.  When a node "malfunctions", another node will issue a SCSI-3 reservation against the 3 coordinator disks.  When the broken node tries to access those disks (as it does every few seconds normally) it will be rejected and the box will panic (I'm pretty sure it panics - test it)

 

Feel free to email me off-list if you have any other questions.

 

Thanks,

Matt

 

--
Matthew Zito
GridApp Systems
Email: [EMAIL PROTECTED]
Cell: 646-220-3551
Phone: 212-358-8211 x 359
http://www.gridapp.com

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of laura pena
Sent: Friday, July 25, 2003 1:04 PM
To: Multiple recipients of list ORACLE-L
Subject: Re: RAC - Configuring Disk Coordinator

Sorry all my message got hacked here is the first paragraph

 

Going through the Veritas installation guide  (pg 47) and I have a question on the required 3 LUN creation needed to support RAC for Veritas DBE/AC, when setting up Disk Coordinator:

laura pena <[EMAIL PROTECTED]> wrote:

- Configuration - Should each of these 3 LUN be on seperate disks?
- What is the smallest LUN that Hitachi 9570V can be? I guess I can ask our rep if no ones knows.
-Should these LUNs be mirrored?
- Coordinator disks are used to support IO fencing can anyone elborate how this happens?

 

Thanks in advance,

 

Lizz

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