Simon,

Yes, the fragment size for the storage unit itself, see my other e-mail.

Justin.

On Wed, 16 Sep 2009, WEAVER, Simon (external) wrote:

> Are we talking about fragment size for the storage unit itself?
> Mine is set to the default 1048575MB
>
> I thought the default would be acceptable for LTO3/ LTO4. (ie:
> 1048575MB)
>
> But happy to hear what others do
> Simon
>
> ________________________________
>
> From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Dean
> Sent: Wednesday, September 16, 2009 1:59 PM
> To: william.d.brown AT gsk DOT com
> Cc: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: Re: [Veritas-bu] Fragment size for LTO4 on NBU 6.x
>
>
> 20GB here, using IBM 3592. I've considered making the fragment size
> larger, but ..... if it aint broke....
>
>
>
> On Wed, Sep 16, 2009 at 7:26 PM, <william.d.brown AT gsk DOT com> wrote:
>
>
>       What are people using for the fragment size on LTO4 (or I guess
> LTO3) with
>       NBU 6.x?
>
>       I ask because the default is 1TB, i.e. more or less don't
> fragment.
>
>       The argument for a large fragment is that the backup doesn't
> have to stop
>       so often as it does briefly at the end of each fragment to
> update the
>       Master, and also the inter-fragment file markers waste
> space..though
>       that's hardly a consideration on such large tapes now.
>
>       The argument for a small fragment was that the tape can position
> at full
>       speed to the file marker for the appropriate fragment for a
> restore,
>       rather than reading the tar file from the top at read speed,
> which for a
>       large tape could be a very long time.
>
>       We used to (dating back to DLT7000) set a 2GB fragment, as back
> then this
>       was thought a good idea in case you wanted to dd the tape to
> disk and read
>       it without NetBackup.  UNIX file systems did not take files >
> 2GB.  Well I
>       can't say we ever tried it and it's a silly small size now.
>
>       But what are people using - 100GB?  200GB?  Does it really make
> a
>       difference...
>
>       William D L Brown
>
>
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