11-15-2013 09:10 AM
What is the impact of using filepath wildcard characters in the backup selections of a multistream enabled backup policy?
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11-15-2013 10:26 AM
NOTE wildcards can be dangerous. I.e. if you have /* you could get 500 backups streams.
Be explicit in what you specified with wildcards. It's possible that you can overload the scheduler if you have 5000 jobs all try to be initiated at the same time; OR it can slow things done substantially.
When used correctly, they are a positive thing.
How NBU uses them?
Well - try this test:
create a test policy with /etc/* in it. You'll get 300 or so backup streams generated. In this case there is no control over what is separated in a stream. EVERY file and directory, directly under /etc/ will have a separate stream.
The Administrator Guide, Volume 1, has a lot more information about the effects of multistreaming.
*** My recommendation - use NEW_STREAM :)
11-15-2013 09:54 AM
Multiple streams.... ???
11-15-2013 09:56 AM
The impact is that it filter out what your backup selection is? I am not quite sure what you mean, I have this configuration on several production file servers. I use a NEW_STREAM directive to split up multiple 'chunks' of wildcard paths (works especially well for user directories, get all of A*, B*, C* names in a stream, D*, E*, F*, etc.
11-15-2013 09:57 AM
http://www.symantec.com/business/support/index?page=content&id=TECH31512
This has a bit more information on multistreaming.
11-15-2013 10:26 AM
NOTE wildcards can be dangerous. I.e. if you have /* you could get 500 backups streams.
Be explicit in what you specified with wildcards. It's possible that you can overload the scheduler if you have 5000 jobs all try to be initiated at the same time; OR it can slow things done substantially.
When used correctly, they are a positive thing.
How NBU uses them?
Well - try this test:
create a test policy with /etc/* in it. You'll get 300 or so backup streams generated. In this case there is no control over what is separated in a stream. EVERY file and directory, directly under /etc/ will have a separate stream.
The Administrator Guide, Volume 1, has a lot more information about the effects of multistreaming.
*** My recommendation - use NEW_STREAM :)
11-15-2013 10:56 AM
11-15-2013 11:15 AM
Be very careful to not multistream on the same physical drive as thrashing can occur.
NOTE: This does not apply to a SAN attached drive as the drive gets mapped across several SAN drives.
11-15-2013 11:46 AM
I concur with Stumpr and Deb,
Dnt overload it..use it wisely to get positive results...