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List: veritas-bu
Subject: RE: [Veritas-bu] Can SAN Media Servers share tapes?
From: scott.kendall () abbott ! com
Date: 2003-09-26 17:38:01
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you can force the read from another server in regular restore activities
using bpimage to modify the catalog, the force restore media server option
or the failover media server restore option.
you could look at using Storage Unit Groups and having the SAN media
server's STU be the highest priority in the list, but then use another
media server's STU if necessary. just make sure your max number of jobs
per client is not larger than the number of drives x mpx available in the
SAN media server's STU or you'll always use both STUs (SAN media server
and LAN), which is probably not what you want (assuming schedule's mpx are
high enough and all streams from the media server are using the same
retention, otherwise, you'll have to factor that in as well).
- Scott
"Donaldson, Mark" <Mark.Donaldson@experianems.com>
Sent by: veritas-bu-admin@mailman.eng.auburn.edu
09/25/2003 10:29 AM
To: "'Gardner, Jesse'" <Jesse.Gardner@storaenso.com>,
"'veritas-bu@mailman.eng.auburn.edu'" <veritas-bu@mailman.eng.auburn.edu>
cc:
Subject: RE: [Veritas-bu] Can SAN Media Servers share tapes?
Your "light bulb" moment is correct. Each media server keeps its own
media
database so once a tape is assigned to a media server, no other media
server
can use it. For duplication activities, there's the ability to force the
read from another server but regular backup/restore activities don't
support
this.
The upcoming v5.0 doesn't fix this but on the futures list is a
consolidated
media database, per Dave Little, so the problem will eventually be fixed.
It'll also solve a failover problem for media servers.
-M
-----Original Message-----
From: Gardner, Jesse [mailto:Jesse.Gardner@storaenso.com]
Sent: Thursday, September 25, 2003 7:06 AM
To: 'veritas-bu@mailman.eng.auburn.edu'
Subject: [Veritas-bu] Can SAN Media Servers share tapes?
Scenario:
One SAN-attached HP LTO Library.
The Master server is also the Robotic Control Host.
Five other SAN Media Servers share the library.
Each of these servers has their own policy, to back themselves up with
their
own storage unit.
There are (for the example) 5 tapes in the library, all in one volume
pool.
Each of the above policies uses the volume pool.
Last night I noticed that one of the servers was getting "unable to
allocate
new media, storage unit has none available". Available_Media shows that
all
five tapes are "Active" and not even close to capacity. Then the cartoony
lightbulb went on above my head. Once a media server uses a tape, other
media servers can't write to them. In a way, it kind of makes sense.
Is there any way around this? Can two of my SAN Media Servers write to a
single tape?
Thanks,
Jesse
_______________________________________________
Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
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<br><font size=2 face="Arial">you can force the read from another server in regular \
restore activities using bpimage to modify the catalog, the force restore media \
server option or the failover media server restore option.</font> <br>
<br><font size=2 face="Arial">you could look at using Storage Unit Groups and having \
the SAN media server's STU be the highest priority in the list, but then use another \
media server's STU if necessary. just make sure your max number of jobs per \
client is not larger than the number of drives x mpx available in the SAN media \
server's STU or you'll always use both STUs (SAN media server and LAN), which is \
probably not what you want (assuming schedule's mpx are high enough and all streams \
from the media server are using the same retention, otherwise, you'll have to factor \
that in as well).</font> <br>
<br>
<br><font size=2 face="Arial">- Scott</font>
<br>
<br>
<br>
<br>
<table width=100%>
<tr valign=top>
<td>
<td><font size=1 face="sans-serif"><b>"Donaldson, Mark" \
<Mark.Donaldson@experianems.com></b></font> <br><font size=1 \
face="sans-serif">Sent by: veritas-bu-admin@mailman.eng.auburn.edu</font> <p><font \
size=1 face="sans-serif">09/25/2003 10:29 AM</font> <br>
<td><font size=1 face="Arial"> </font>
<br><font size=1 face="sans-serif"> To: \
"'Gardner, Jesse'" <Jesse.Gardner@storaenso.com>, \
"'veritas-bu@mailman.eng.auburn.edu'" \
<veritas-bu@mailman.eng.auburn.edu></font> <br><font size=1 \
face="sans-serif"> cc: </font> \
<br><font size=1 face="sans-serif"> Subject: \
RE: [Veritas-bu] Can SAN Media Servers share tapes?</font></table> <br>
<br>
<br><font size=2 face="Courier New">Your "light bulb" moment is correct. \
Each media server keeps its own media<br> database so once a tape is assigned \
to a media server, no other media server<br> can use it. For duplication \
activities, there's the ability to force the<br> read from another server but regular \
backup/restore activities don't support<br> this.<br>
<br>
The upcoming v5.0 doesn't fix this but on the futures list is a consolidated<br>
media database, per Dave Little, so the problem will eventually be fixed.<br>
It'll also solve a failover problem for media servers.<br>
<br>
-M<br>
<br>
-----Original Message-----<br>
From: Gardner, Jesse [mailto:Jesse.Gardner@storaenso.com]<br>
Sent: Thursday, September 25, 2003 7:06 AM<br>
To: 'veritas-bu@mailman.eng.auburn.edu'<br>
Subject: [Veritas-bu] Can SAN Media Servers share tapes?<br>
<br>
<br>
Scenario:<br>
<br>
One SAN-attached HP LTO Library.<br>
The Master server is also the Robotic Control Host.<br>
Five other SAN Media Servers share the library.<br>
Each of these servers has their own policy, to back themselves up with their<br>
own storage unit.<br>
There are (for the example) 5 tapes in the library, all in one volume pool.<br>
Each of the above policies uses the volume pool.<br>
<br>
Last night I noticed that one of the servers was getting "unable to allocate<br>
new media, storage unit has none available". Available_Media shows that \
all<br> five tapes are "Active" and not even close to capacity. Then \
the cartoony<br> lightbulb went on above my head. Once a media server uses a \
tape, other<br> media servers can't write to them. In a way, it kind of makes \
sense.<br> <br>
Is there any way around this? Can two of my SAN Media Servers write to a<br>
single tape?<br>
<br>
Thanks,<br>
Jesse<br>
_______________________________________________<br>
Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu<br>
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu<br>
_______________________________________________<br>
Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu<br>
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu<br>
</font>
<br>
<br>
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Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
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