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You can't share DSSU amongst multiples media servers.
You can't create DSSU-groups (ie when one is full, switch to
another..apparantly fixed in 6.0)
DSSU are mapped one-to-one to volume pools, when de-staging.
Previous to 5.0MP4, (unsure about 5.1) DSSU's might not purge in time
for backups and jobs would fail.

That's just off the top of my head....

Paul

--=20


> -----Original Message-----
> From: veritas-bu-admin AT mailman.eng.auburn DOT edu=20
> [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of=20
> Geyer, Gregory
> Sent: April 27, 2006 1:28 PM
> To: Steven L. Sesar; NetBackup Veritas
> Subject: RE: [Veritas-bu] DSSU/DSU experience
>=20
>=20
> Steve,
>=20
> Works fine as long as you're at least MP4.  Prior to that DSSUs would
> stage the files in the filesystem sequentially regardless of retention
> levels.  Thus if you're not mixing retention on a tape (but are on the
> filesystem) you could have the situation where tapes are constantly
> being mounted and unmounted, killing the advantages of the=20
> batch nature
> of DSSU.
>=20
> With 5.1 MP4 this has been fixed by separating the staging jobs by
> retention level though you'll want to take note of=20
> MAX_STAGING_JOBS and
> STAGING_JOB_KB_LIMIT parameters.
>=20
> Other note is not to get too cheap of disk for this work, and=20
> make sure
> there's enough of it.  One day's worth of problems can back you up
> trying to stage to tape for several days afterwards.
>=20
> G.
>=20
> -----Original Message-----
> From: veritas-bu-admin AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of=20
> Steven L.
> Sesar
> Sent: Thursday, April 27, 2006 10:09 AM
> To: NetBackup Veritas
> Subject: [Veritas-bu] DSSU/DSU experience
>=20
> We're in the process of rearchitecting our BUR=20
> infrastructure. The most=20
> profound change will be the addition of disk storage, as we are 100%=20
> tape, right now. We're considering a few different disk technologies,=20
> such as VTL, DataDomain NAS heads, as well as traditional DSU/DSSUs.
>=20
> I've heard anecdotal evidence that DSU/DSSU functionality in=20
> NBU 5.1 is=20
> less-than-stellar. Would anyone care to share their overall=20
> experience=20
> with  disk storage?
>=20
> Thanks,
>=20
> Steve
>=20
> =20
>=20
> _______________________________________________
> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>=20
> _______________________________________________
> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>=20
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