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01-10-2003 07:46 AM
01-10-2003 07:46 AM
VA7400
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01-10-2003 08:10 AM
01-10-2003 08:10 AM
Re: VA7400
Please read BC manual for more info
Eugeny
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01-10-2003 08:26 AM
01-10-2003 08:26 AM
Re: VA7400
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01-16-2003 07:08 AM
01-16-2003 07:08 AM
Re: VA7400
this is not possible on a VA7XXX array. You have to use BC functionality witch effectively reserved the same amount of space.
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01-17-2003 04:03 AM
01-17-2003 04:03 AM
Re: VA7400
Note that the VA uses a relatively small block size (246K). This typically provides better application performance during a snapshot operation by minimizing the data that must be copied during the 'copy on write' event.
Don't assume all snapshots are equal in performance and management.
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01-17-2003 03:11 PM
01-17-2003 03:11 PM
Re: VA7400
If you heavily use a "snapshot" copy, you can impact performance of production access to its data, since you are often accessing the exact same spindle/blocks for both operations (for unchanged data). You can avoid this with a "clone", which can be put on its own spindles (big slow cheap drives, if desired).
This is important if you are doing other than keeping a "snapshot" in case you need to revert to it for some reason. Backups, Test/Dev work, report generation & data mining, these all can use the snapshot so heavily that production is impacted, and a "clone" would be better. Clones can also be split & then resynched, with only changed tracks updated, for much faster sync-ups.
By contrast, the HP VA arrays only have the snapshot capability, no full-copy "clone" is possible. One plus is that HP throws in (or used to throw in) the snapshot SW for free with an array, where EMC charges for it (and it's not cheap). Even for just doing a snapshot, the Clariion SW has more features and extra capabilities than the HP version, but, as I $aid, it co$ts. Lunch ain't free here either...
Hope it helps! --bmr
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