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тАО09-13-2004 06:56 AM
тАО09-13-2004 06:56 AM
I have two DS20e with a double HSZ80 and a DS25 with a HSG80. All three systems have the VOLSHAD license and OpenVMS 7.3-1. Is it posible to create volume shadow sets betwen the HSZ80 and HSG80 devices?
Bojan
Solved! Go to Solution.
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тАО09-13-2004 07:13 AM
тАО09-13-2004 07:13 AM
Re: Volume shadowing betwen HSZ80 and HSG80
It depends a bit. Are the devices presented with EXACTLY the same number of blocks after INIT?
Then there is no problem.
But I expect the HSG to hold bigger disks..
Then, it CAN be done since V7.3-2, and there WERE plans to also make this available with a patch kit for 7.3-1, but I don't remember seeing it. Cannot check now, and since we went 7.3-2 I was no longer that much interested in 7.3-1 kits... :-(
So, my guess is that going 7.3-2 will be the way (7.3-1 is soon no longer supported anyway).
hth,
Jan
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тАО09-13-2004 08:43 AM
тАО09-13-2004 08:43 AM
Re: Volume shadowing betwen HSZ80 and HSG80
Bojan
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тАО09-13-2004 09:18 AM
тАО09-13-2004 09:18 AM
SolutionIf you need instructions on how to do that, just let us know. You may have to do it to both but with a little luck, only one controller needs to partition the disk(s).
john
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тАО09-13-2004 06:52 PM
тАО09-13-2004 06:52 PM
Re: Volume shadowing betwen HSZ80 and HSG80
Did you init the disk on a HSG using a 'save on disk' qualifier ?
If so, the disk looses some blocks for information wich you better can not have on the disk. It actualy makes the disk hardcoded in some slot. But this is youre problem :-( . I never do this anymore. Normaly the disks should have the same size on a HSZ and a HSG. Both are (to be honoust) the same controllers only the HSZ is SCSI/SCSI and the HSG is Fiber/SCSI (HSV is Fiber/Fiber).
AvR
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тАО09-14-2004 08:55 AM
тАО09-14-2004 08:55 AM
Re: Volume shadowing betwen HSZ80 and HSG80
Yours solution seems great. I will try to test it sooner posible.
Anton,
Thats probably the reason for the size difference. The disks was not initialized by me so I must check.
Points (a lot of them) will arrive after testing!
Bojan
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тАО09-14-2004 10:25 AM
тАО09-14-2004 10:25 AM
Re: Volume shadowing betwen HSZ80 and HSG80
Your best option is to install V7.3-2 (from V7.3-1 it's really just a big patch kit! There should be NO application compatibility issues)
You will then enjoy dissimiliar device shadowing (DDS), dynamic volume expansion (DVE), and (with VMS732_HBMM-V0200 due by the end of this week) host based mini merge. DDS was created SPECIFICALLY to deal with the issue of shadowing across different controllers. DVE opens a whole new world of storage management, including the ability to upgrade your storage with ZERO downtime. HBMM will reduce your merge times by orders of magnitude.
Although it *may* be possible to adjust volumes to be precisely the same size, it's very fiddly.
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тАО09-21-2004 04:31 AM
тАО09-21-2004 04:31 AM
Re: Volume shadowing betwen HSZ80 and HSG80
May I suggest to have a look to the discussion about HBMM Experience whith WBM_MSG_UPPER dynamic system parameter
especially the 2 lasts messages.
the link is :
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=686571
Regards,
Fodil.
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тАО09-21-2004 04:45 AM
тАО09-21-2004 04:45 AM
Re: Volume shadowing betwen HSZ80 and HSG80
Can you enlarge the header bitmap in INDEXF.SYS with DVE?
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тАО09-21-2004 05:36 AM
тАО09-21-2004 05:36 AM
Re: Volume shadowing betwen HSZ80 and HSG80
I think the way this is done is that you can expand a volume up to the limit which is set when the volume is inited. This limit sets the size of the storage bitmap. INDEXF.SYS can grow anyway.
Purely Personal Opinion