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тАО10-18-2007 03:16 AM
тАО10-18-2007 03:16 AM
Any direction would be appreciated.
Solved! Go to Solution.
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тАО10-18-2007 03:58 AM
тАО10-18-2007 03:58 AM
SolutionHe may want all he like, but it ain't going to happen.
1TB is the limit.
Think about it!
OpenVMS address all (512 byte) disk blocks using 32-bit pointers. That would suggest an absolute max of 2TB. But nobody trusts the 'signed versus unsigned' implications of using that last bit. Thus the 1TB limit (2*31 * 512) was born.
You could actually combine multiple 1TB units into a single bound volume set, giving the appearance of a 4TB device.
That would be legal, and transparent, but a silly thing to do.
Please question the customer WHY they think a a single volume is preferrable and HOW they intend to provide backups and disaster recovery for such large blob of data.
Multiple smaller, but still big, volumes give much better visibiltiy and opportunities for tuning an parallisme with just a small increment in management overhead.
Good Luck!
Hein.
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тАО10-18-2007 04:26 AM
тАО10-18-2007 04:26 AM
Re: Volume size limitation on OpenVMS 7.3
I agree with Hein's analysis, except for the comment:
"That would be legal, and transparent, but a silly thing to do."
Volume sets may be out of fashion, but they are a useful tool. I do agreen with Hein's comment about backup/restore operational issues.
I can conceive of situations where I would use this approach, but they would be highly specific to the individual site.
- Bob Gezelter, http://www.rlgsc.com
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тАО10-18-2007 05:42 AM
тАО10-18-2007 05:42 AM
Re: Volume size limitation on OpenVMS 7.3
V7.3 is quite ancient (and buggy!) with respect to fibre channel and multipath.
V7.3-2, while no longer on standard support, does have much better-performing SCSI and fibre channel storage, if one installs the latest patch kits.
If this site is using host-based volume shadowing, using V7.3-2 is almost a must.
-- Rob
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тАО10-18-2007 07:36 AM
тАО10-18-2007 07:36 AM
Re: Volume size limitation on OpenVMS 7.3
Another thing to throw into the pot is that current EVAs can create a LUN with a maximum size of 2TB...
Cheers,
Rob
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тАО10-18-2007 04:42 PM
тАО10-18-2007 04:42 PM
Re: Volume size limitation on OpenVMS 7.3
regards Kalle
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тАО10-18-2007 07:20 PM
тАО10-18-2007 07:20 PM
Re: Volume size limitation on OpenVMS 7.3
regards Kalle
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тАО10-18-2007 10:32 PM
тАО10-18-2007 10:32 PM