Hi,
Keep your server parallelism to 32 & target session for each drive to 4 and
group parallelism to 8 or 16.
Actually, if a group can send data on 16 streams and each drive can write 4
streams at a time, the balance 12 streams would get divided over the next
available free drive. Also to ensure that the media pool has free append
able media equal to the number of drives you want to use. All this assuming
all three clients are under the same group run together.
Based on the above logic, you can set values for your environment to get the
best out of it. We keep Server parallelism to maximum to get the best
performance. Client parallelism will effect only if group parallelism is set
to 0.
Regards,
Anuj Mediratta
Legato Certified Networker Administrator
Ace Data Devices Pvt. Ltd.
I-132, Ist Floor,
Kirti Nagar,
New Delhi - 110 015.
Phone : 011-51424914
Mobile - 011-32334262
-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTMAIL.TEMPLE DOT EDU]
On
Behalf Of Hicks, Adrian
Sent: Wednesday, September 22, 2004 04:07
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: [Networker] Writing to more Tape drives
Hi,
I wish to improve the performance on our backups by writing to more tape
drives during the backups.
We have 4 DLT4's with 3 clients (1 which is also the NW server). The
backup will only assign 1 drive per client during the backup. So even
when backing up only one client, we have 3 drives free. We have turned
on parallelism to 4 but that just seems to stream multiple file systems
to the 1 drive. Any ideas ?
Our config.
NW 7.1 server, 6.11 Clients.
Tru64 UNIX, with 3 Clients 4 tape drives to backup. But not all back up
at the same time.
Your help would be appreciated.
Thanks
Adrian Hicks
Technical Services Analyst
Bartter Enterprises Pty Ltd. (Steggles)
Ph: +61 2 49244447
Mod: +61 401704067
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