Veritas-bu

Re: [Veritas-bu] FW: Multi Stream Backups

2008-11-28 09:43:58
Subject: Re: [Veritas-bu] FW: Multi Stream Backups
From: Justin Piszcz <jpiszcz AT lucidpixels DOT com>
To: Johan Redelinghuys <johan.redelinghuys AT stg.co DOT za>
Date: Fri, 28 Nov 2008 09:35:02 -0500 (EST)

On Fri, 28 Nov 2008, Johan Redelinghuys wrote:

> Hi all
>
>
>
> Scenario:
>
> Netbackup version: Netbackup 6.5.1
>
> Backups: Exchange Information Store and Exchange mailboxes.
>
>
>
> Backup Hardware:
>
> 1 x LTO4 drive.
>
> Storage Unit: 1 x drive with max streams per drive set to = 8.
>
>
>
> Information store policy:
>
> Limit jobs per policy = 4
>
> Allow mutable data streams = ticked yes.
>
> File List = Microsoft Information Store:\*
>
> # There are 2 x Information stores, One and Two. The backup produces 2 x
> backup streams.
>
>
>
> Mailbox policy:
>
> Limit jobs per policy = 4
>
> Allow mutable data streams = ticked yes.
>
> File List :
>
> NEW STREAM
>
> Microsoft Exchange Mailboxes:\[a-h]*
>
> NEW STREAM
>
> Microsoft Exchange Mailboxes:\[g-l]*
>
> NEW STREAM
>
> Microsoft Exchange Mailboxes:\[m-r]*
>
> NEW STREAM
>
> Microsoft Exchange Mailboxes:\[s-z]*
>
> # The backup produces 4 stream.
>
>
>
> Result:
>
> Both the Information Store Backup and the Mailbox Backup run at the same
> time. (Not best practice, but they do). The two streams of the
> Information Store backups starts and run. The four streams of the
> Mailbox backup start but only two run and two queue.
>
>
>
> Summary:
>
> STU = 1 drive x 8 streams per drive.
>
> Multiplexing of each policy's schedule = 4.
>
> Allow multiple data steams = yes
>
> Master server global setting for "max jobs per client" = 99.
>
>
>
> Problem:
>
>
>
> Although the storage unit allows 8 streams to it and the two policies
> produces 6 streams between them, only 4 run and 2 queue. Why? Any ideas?
>
>
>
> Thanks.

I assume they are both using the same volume pool?

Justin.

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