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Re: unable to mount shadow disk in to shadow set

 
Martin P.J. Zinser
Honored Contributor

Re: unable to mount shadow disk in to shadow set

Hello,

no specific shadowing patches for 7.3-2 are out yet.

What does an anal/disk/shadow give?

Greetings, Martin
David B Sneddon
Honored Contributor

Re: unable to mount shadow disk in to shadow set

Try using /CONFIRM on the mount command.
David B Sneddon
Honored Contributor

Re: unable to mount shadow disk in to shadow set

Another thought... try initializing DRA6 with a different name e.g. DUMMY then adding it in with /CONFIRM.
Wim Van den Wyngaert
Honored Contributor

Re: unable to mount shadow disk in to shadow set

Just saw in your message :
Logical Volume Size 8380080 Expansion Size Limit 8589312

The first disk is 8380080 in size but can increase to 8589312.

The second disk is 8378368 in size, thus smaller than the size of the first disk but can not be expanded to the limit size of 8589312.

Check init/lim.

I may be wrong because I'm stuck on 7.3.
Wim
Ian Miller.
Honored Contributor

Re: unable to mount shadow disk in to shadow set

The logical sizes of the two volumes have to be the same. You can re-init the target disk to change this.
____________________
Purely Personal Opinion
Uwe Zessin
Honored Contributor

Re: unable to mount shadow disk in to shadow set

Ha! You have good eyes, Wim!

It is strange that DSA1: with member DRA5: shows:
...
> Total blocks @8378368@ Sectors per track 64
> Total cylinders 8182 Tracks per cylinder 16
> Logical Volume Size @8380080@ Expansion Size Limit 8589312
...

And DRA6: shows:
> Total blocks @8378368@ Sectors per track 64
> Total cylinders 8182 Tracks per cylinder 16

OpenVMS V7.3-2 allows a volume to grow later, provided that the bitmap is large enough. And it allows shadowing of disks with different physical size - I have tried it with a field-test version.

I don't have experience with the volume growth feature, but it looks like both disks have physically the same size, but somehow the 'Logical Volume Size' is bigger than the physical. Honestly, I do not know if it is OK that it displays a bigger value. I can understand if it is smaller, but bigger?

You can try if '$ ANALYZE/DISK_STRUCTURE/REPAIR DSA1:' fixes it.
.
Mike Naime
Honored Contributor

Re: unable to mount shadow disk in to shadow set

I thought that 7.3-2 was supposed to allow you to shadow different size disks. At least that was one of the "improvements" that I remember from the release notes.
VMS SAN mechanic
David B Sneddon
Honored Contributor

Re: unable to mount shadow disk in to shadow set

V7.3-2 DOES support disks of different sizes. I recently upgraded one machine and when it came time to rebuild the system disk shadow set , the second member was dead. The original disk is a 4GB disk and I added a 9GB disk and it is running quite happily.
Jan van den Ende
Honored Contributor

Re: unable to mount shadow disk in to shadow set

As this all looks to me, Wim had it all, except for the final conclusion:
DSA6 has a LOWER expansion limit than DSA1/DRA5.
Like David reported, since 7.3-2 you CAN shadow unequal-sized devices, BUT: the device to be added CANNOT be SMALLER than the one(s) already in the set!!
Do an INITIALIZE of DRA6 with /LIMIT=8589312 (or bigger), and my guess is that you then WILL be able to add DRA6 to DSA1.

hth

Jan
Don't rust yours pelled jacker to fine doll missed aches.
Uwe Zessin
Honored Contributor

Re: unable to mount shadow disk in to shadow set

Excuse me for my insistence, but it looks to me like both disks have the same physical size (8378368 blocks), but VMS somehow beleives that the current shadowset (member) has a bigger logical size (8380080 blocks).

Please anybody re-read my previous message and tell me if there is an error in my thinking and where it is.
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