Re: [Veritas-bu] VTL & NetBackup Best Practice
2008-03-05 15:27:33
No
question.
eliminate multiplexing with VTL.
just
create the drives you need. Don't MPX and don't SSO.
if you
create too many drives and run too many streams, it will slow down your "per
stream" throughput.
same
as with tapes, however....if you have 10 streams per drive to 4 drives, there's
no reason to expect your per stream throughput to be any less when backing up 1
stream to 40 drives.
Paul
--
Hi, I am currently testing my NetBackup environment to backup to VTL.
We are seeing great backup performance but it seems like it requires a slight
re-architecture to the current environment. I am being told to eliminate
multiplexing... You can multiplex to a virtual drive but when it comes time to
restore and to duplicate off to physical tape from a virtual cartridge that
was multiplexed the performance is not very good. The Vendor said that
multiplexing should be eliminated and instead of increasing multiplexing you
can simply create additional virtual drives when needed. Since adding virtual
tape drives in theory has no cost associated with it why not do this and
eliminate multiplexing and SSO all together (that is the
approach/mentality).
So my question to the forum is have others
deployed VTLs in a similar fashion (i.e. MPX = 0) and how have things scaled
and is there any associated management headaches? The couple con's of the
above approach in my mind would be: * Slower responding NBU GUI because
there will be so many devices it will have to manage/query * More BPTM
processes since each tape drive in use requires one an additional BPTM
process * Slower backups on a per stream basis (which is OK because you
have many drives I guess)
Can anyone comment if they foresee other
drawbacks to this approach or have best practice recommendations?
Thank in advance for any
feedback... -Bill
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