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I'd say the hard limit is the amount of throughput you are
going to expect. Three 1U Media servers only have so many expansion and bus
options versus an 8U Behemoth with expansion and bus speed galore. Then
again, if you are using a SAN for disk storage then 1 HBA with 2 x 4Gbit
connections makes your disk and tape a lot more accessible (and fast.)
Really, I don't think you can look at number of jobs per media server. You
need to look at amount of time running at what MB/sec per media server v(to disk
and/or tape.) If you pick an arbitrary amount, say 10,000 jobs per media
server then you completely forget to account for the content of the jobs.
What if each job is a folder on a file system? Or a small DNS server with
3GB of storage? You'd look at that 10,000 jobs and say "wow, its
overloaded" while another server backing up 150GB Database logs sets would only
have 700 jobs and be "not very busy at all" while backing up (potentially) the
same amount of data in the same time!
-Jonathan
I think your question
should rather be – “At what point do you decide you need another
master?”
Your original question
might not gain you the answer you want because most environments only have one
master (except for special needs i.e. needing an old 5.1 master to backup
clients that can’t be migrated from 4.5). Some very large
environments have multiple masters but I doubt number of clients all by itself
is the deciding factor.
Also number all by
itself doesn’t really tell you anything. If I have to backup 30 x 4 TB
Oracle Instances the number of jobs might be fairly low but the time/throughput
is apt to be very high and might be a consideration whether I’d want other
servers especially if it is unrelated data. On the flip side doing
2000 servers with 16 GB of OS backups might imply other considerations.
Are your systems to be backed up geographically dispersed? What other
technology is in place (i.e. BCV/SRDF, snapshots etc…)
From:
veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Jim VandeVegt
Sent: Friday, March 21, 2008 9:31
AM
To:
VERITAS-BU AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Job per day per
master server?
We run about 1000 per day, and we are not particularly
big.
Jim VandeVegt
VandeVegt @t yahoo.com,
Jim.VandeVegt @t PhysiciansMutual.com
Eliminate the IRS and put the fair
consumption tax in place.
Visit http://www.fairtax.org/
----- Original Message ----
From: Bancal
<netbackup-forum AT backupcentral DOT com>
To:
VERITAS-BU AT mailman.eng.auburn DOT edu
Sent: Friday, March 21, 2008 2:43:35
AM
Subject: [Veritas-bu] Job per day per master server?
I'd like
to get some info to ponder it afterwards.
I'd wish to know what is a let's
say "normal" number of jobs per day for an average master server in your
environment regardless of NetBackup version you
run?
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