Thanks Jeff, yes that was another issue, where the 2 jobs in questions have
2 streams, both using 2 separate drives. I can try and split them to create
more streams, which I would hope is going to use more drives that are
available.
Simon Weaver
Technical Support
Windows Domain Administrator
EADS Astrium
Tel: 02392-708598
Email: Simon.Weaver AT Astrium.eads DOT net
-----Original Message-----
From: Jeff Lightner [mailto:jlightner AT water DOT com]
Sent: 31 October 2005 15:42
To: Greenberg, Katherine A; WEAVER, Simon; veritas-bu AT mailman.eng.auburn DOT
edu
Subject: RE: [Veritas-bu] Master / Media Servers Explained Please
FYI: We actually define all of our Media Server "storage units" to see
all the drives like the Master server "storage unit" does. Netbackup
will not try to use the same drive on two different servers in the same
Master/Media environment. If you had two different Masters that could
be an issue I suppose.
We limit the number of drives used by the Policy definition rather than by
restricting the number of drives an individual host could potentially
use. If your backup only has 1 stream it will only use 1 drive no
matter how many the host has available.
-----Original Message-----
From: Greenberg, Katherine A [mailto:GreenbergKA AT aetna DOT com]
Sent: Monday, October 31, 2005 10:15 AM
To: WEAVER, Simon; Jeff Lightner; veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] Master / Media Servers Explained Please
I'm saying from a Performance perspective, you do NOT want a single host
using 25 tape drives at a time. You did state 25 drives, right? To get the
best possible results you would want to throw a couple of Media servers into
your environment to enable you to take advantage of the drives you're
putting in. If you only want to have one server, you won't need that many
drives.
My .02!
~Kate
-----Original Message-----
From: WEAVER, Simon [mailto:simon.weaver AT astrium.eads DOT net]
Sent: Monday, October 31, 2005 10:06 AM
To: Greenberg, Katherine A; Jeff Lightner; veritas-bu AT mailman.eng.auburn DOT
edu
Subject: RE: [Veritas-bu] Master / Media Servers Explained Please
Hi Kate
Ideally, I wanted to have 1 master server, configured to use the robotic
library and use as many drives as possible, leaving spares for restores /
catalogue backups ect.
So if I have 1 master server with multiple jobs, will it not use all the
available drives? I thought that is what Multiplexing & Max concorrent jobs
was all about?
Simon
-----Original Message-----
From: Greenberg, Katherine A [mailto:GreenbergKA AT aetna DOT com]
Sent: 31 October 2005 14:40
To: Jeff Lightner; WEAVER, Simon; veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] Master / Media Servers Explained Please
One more thing... you also don't want to have 25 tape drives all being used
by the same host at the same time, unless you've got 3 or 4 HBAs in the
system. By adding Media servers, you can utilize all the tape drives at once
and limit the number of drives each host is using at the Storage Unit level.
And Jeff, pre-6.0, there are SSO parameters you can add to vm.conf to make
one host be the SSO scan host all the time (SSO_SCAN_ABLITY). With 6.0, all
device allocation is handled on one host (the EMM server, I think it's
called) so that problem goes away.
~Kate
-----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 Jeff
Lightner
Sent: Monday, October 31, 2005 9:29 AM
To: WEAVER, Simon; veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] Master / Media Servers Explained Please
MASTER SERVER
A server that controls all other servers and clients and has most of your
catalogs. Most people also use it as the robotic control host as well. It
has direct write access to the tape drives and most client backups go
through it via LAN.
MEDIA SERVER
A server that has direct write access to the tape drives. The main reason
we have them here is because we have SAN and large database
servers. By configuring them as Media Servers we avoid using LAN to do
backups. Also it allows for direct restore. They also contain some
catalog information for the backups done on them. You could have LAN
clients backed up on media servers to take advantage of additional CPU and
I/O backplane but we don't.
The main PRO to MEDIA SERVERS is as indicated above. You can backup and
restore using drives via SAN so that you don't impact your LAN. Also by
using CPU and backplane of a separate server you do get some performance
improvement.
The CONs to MEDIA SERVERS:
1) The SCAN HOST floats so to get it back the way you want you have to down
the drive on all of them then up it on the one that you want first then up
it on all others. This can be scripted so is not a huge problem
- just an annoyance.
2) As noted they do have some catalog information so you have to be careful
not to retire without migrating its catalogs if you need access in future
(especially if you have any LAN clients using them rather than the MASTER
SERVER).
Also I gather from comments on this thread that you don't have to do full
MEDIA SERVER any more for the purpose for which we use them (just to back
themselves up - no LAN clients). If you intend to do the same make sure you
get the cheaper license for that purpose.
-----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 WEAVER,
Simon
Sent: Monday, October 31, 2005 7:44 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Master / Media Servers Explained Please
Hi Everyone
Presently, firefighting NBU 5.x and 3.4 Master Servers with various backup
issues which I will not bore you all about yet :-)
I have just discovered a site that I work with has approx 10 MEDIA SERVERS
and many master servers.
I am presently using 2 master servers and am being told that I will need to
implement Many media servers asap.
But my concerns are costs and what benefit the media servers will give me. I
will be implementing a 25 drive 700 TL system in the near future, and wanted
to make a fault tolerant Master Server to perform the job, but can anyone
give me any pros / cons as I feel uneasy about having many 2003 Media
Servers on board. Also, costs are going to be an issue, so if anyone has any
reasons or limitations as to why 1 master server could not backup / restore
many clients, please do let me know
Thanks everyone for any input :-)
Simon
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Please notify the sender by return email.
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