I will try what you said about savegroup parallelism (setting to 0). I think
using only one group will introduce problems with the size of data that backed
up on drives. Save sets's sizes are completely different, in the range 250MB to
100GB. We cant choose which save set will backed up by which drive, so we
choose to create 4 groups. We backup data directly from SAN environment with
SDLT320 tapes.
-----Original Message-----
From: Peter Viertel [mailto:Peter.Viertel AT macquarie DOT com]
Sent: Friday, September 16, 2005 12:57 PM
To: Legato NetWorker discussion; Turgay Çavdar (Network Grup Başkanı)
Subject: RE: [Networker] How to use all tapes together?
I think your problem is that you have set the group parallelism to 8... make
it zero. and see how you go. group parallelism does not work in the way that
most people want it to, I also had trouble until i realised that it replaces
the server parallelism number when the group is calculating how many sessions
to start.
If i were you i would use just one group, and one pool.
eg:
1 client record with Savesets: All
server par = 32
group par = 0
device target par = 1
client par=32
jukebox par = 4
This will result in four tapes being mounted and 32 streams being spread evenly
over them.... but then you will have other problems, such as feeding data to
the four drives fast enough.... you dont say what tape technology you are
using, but for example if you are writing to SDLT320 tapes you need to stream
data at 16MB * 4 drives == 64MB/sec == 700Mbits.. which is theoretically
possible over gigabit networks at least, but then you have to consider if your
client server can actually access data at that speed from the disks....
Finally, you also have to consider that the data on the tapes will be
multiplexed 8 ways... and this can have a serious impact on your restore speed.
-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT listserv.temple DOT
edu]On Behalf Of Turgay Çavdar (Network Grup Baskani)
Sent: Friday, 16 September 2005 3:51 PM
To: NETWORKER AT listserv.temple DOT edu
Subject: [Networker] How to use all tapes together?
We are using networker version 7.1.2 and 4 tapes in the jukebox. We have got
one client and it has 800 GB of data (32 mount). We planned to divide this
800GB of data to 4 parts (approx. 200GB and 8 mount in each part) and use every
tape so the Backup time will be very short. We create 4 group and in the client
we set for 8 mounts for every group. Server parallism is 32, client parallelism
is 8, group parallelism is 8, each tape has a target session value set to 8. In
this configuration when we start 4 group only two tapes are used. Why we cant
use 4 drives at the same time? (Jukebox parallism set to 4)
To sign off this list, send email to listserv AT listserv.temple DOT edu and
type "signoff networker" in the
body of the email. Please write to networker-request AT listserv.temple DOT edu
if you have any problems
wit this list. You can access the archives at
http://listserv.temple.edu/archives/networker.html or
via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER
NOTICE
This e-mail and any attachments are confidential and may contain copyright
material of Macquarie Bank or third parties. If you are not the intended
recipient of this email you should not read, print, re-transmit, store or act
in reliance on this e-mail or any attachments, and should destroy all copies of
them. Macquarie Bank does not guarantee the integrity of any emails or any
attached files. The views or opinions expressed are the author's own and may
not reflect the views or opinions of Macquarie Bank.
To sign off this list, send email to listserv AT listserv.temple DOT edu and
type "signoff networker" in the
body of the email. Please write to networker-request AT listserv.temple DOT edu
if you have any problems
wit this list. You can access the archives at
http://listserv.temple.edu/archives/networker.html or
via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER
|
