topic Re: initializing a shadow set member in Operating System - OpenVMS

initializing a shadow set member

Kevin Carter_3 — Fri, 07 Mar 2008 17:45:46 GMT

I just replaced one member of a 2 disk shadow set, due to a disk crash. The original disks were initialized with a command similar to the following:

$ init $1$dga3: /cluster=128/nohigh/header=64000/owner=system oradata

My question is: does the replacement disk need to be initialized with the /cluster=128/nohigh/header=64000 parameters or will it copy these parameters from the existing shadow set member?

Re: initializing a shadow set member

Volker Halle — Fri, 07 Mar 2008 17:50:09 GMT

SAVDBA,

you do not neeed to INIT the new shadowset member at all. OpenVMS Volume Shadowing will make sure through a shadow-copy to the new member, that all disk blocks will be identical to the other member.

It may be considered good prative, to just INIT the new member with a scratch label and mount it privately once, to make sure it is o.k. and can be written to, before trying to mount it into an existing shadowset.

Volker.

Re: initializing a shadow set member

Michael Moroney — Fri, 07 Mar 2008 18:08:34 GMT

As long as you don't use the "/VERIFY=LABEL" qualifier on the MOUNT command, there is no need to initialize the disk. If you do (and there is no need if this is a one-time MOUNT to add it the first time), it needs to have a label "SCRATCH_DISK".

(The documentation isn't clear to me whether it must be "SCRATCH_DISK" or if a label identical to the existing shadowset is also acceptable)

Re: initializing a shadow set member

Kevin Carter_3 — Fri, 07 Mar 2008 18:11:45 GMT

The question was answered by responses from the forum. Thanks