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тАО12-08-2003 08:04 PM
тАО12-08-2003 08:04 PM
Shadow copy/merge in 7.3-2
In OpenVMS 7.3-2 the use of spinlock has been reduced alot. Is there any knowledge of how much this has increased performance of shadow merge or shadow copy?
Regards, Torfi.
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тАО12-08-2003 08:43 PM
тАО12-08-2003 08:43 PM
Re: Shadow copy/merge in 7.3-2
Purely Personal Opinion
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тАО12-09-2003 09:38 AM
тАО12-09-2003 09:38 AM
Re: Shadow copy/merge in 7.3-2
Reduction in spinlock contention will only improve performance if it was a bottleneck. If your systems were running with high MPSYNCH (say, > 60%) during merge or copy operations, then you *may* experience an improvement.
Otherwise, you need to identify the most significant bottle neck and address it. A few simple things, try and have the TARGET disk local to the system performing the merge or copy. Try to avoid accessing a shadowset undergoing a merge.
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тАО12-10-2003 02:50 AM
тАО12-10-2003 02:50 AM
Re: Shadow copy/merge in 7.3-2
We are running Oracle RDBMS on shadow sets on EMA12000 boxes. What we have experienced is that in the case of disturbance of the shadow set, forcing merge to take place, we have had to break the 2 member shadow and perform a full copy at a later hour when traffic has decreased. A understand that a mini-copy should be the fastest algorithm for shadow sets recovery as it uses only 4 I/Os instead of 5 in full copy. But I have not seen how one can invoke a mini-copy instead of full. Any comments on that?
Regards, Torfi.
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тАО12-10-2003 03:55 AM
тАО12-10-2003 03:55 AM
Re: Shadow copy/merge in 7.3-2
Purely Personal Opinion