I tested with compression and without compression.No much difference in
performance.
"Seay, Paul"
<seay_pd@NAPT To: [EMAIL PROTECTED]
HEON.COM> cc:
Sent by: Subject: Re: RAID5 in TSM
"ADSM: Dist
Stor Manager"
<[EMAIL PROTECTED]
RIST.EDU>
10/22/2002
06:29 AM
Please
respond to
"ADSM: Dist
Stor Manager"
Are you running compression?
Paul D. Seay, Jr.
Technical Specialist
Naptheon Inc.
757-688-8180
-----Original Message-----
From: Raghu S [mailto:raghu@;COSMOS.DCMDS.CO.IN]
Sent: Tuesday, October 22, 2002 8:03 AM
To: [EMAIL PROTECTED]
Subject: RAID5 in TSM
Hi,
There was a lot of discussion on this topic before.But i am requesting TSM
gurus give their comments again.
The set up is like this.
TSM Server : Windows NT 4.0 SP6, TSM 5.1.0.0
392 MB memory, P III
Adaptech Ultra SCSI
Hard Disk : Internal Hardware RAID 5:
array A : 8.678GB * 3 : 17.356GB data and 8.678 GB
parity
array B : 35.003 GB * 3 : 70.006GB data and 35.003
GB parity.
Both array A and array B are connected to the same channel.
OS and TSM 5.1 are installed on array A
TSM data base, recovery log and Disk storage pool are installed in array B.
Database : 2GB+2GB = 4 GB and mirrored at TSM level on the same array
Recovery Log : 500MB + 500 MB = 1 GB and mirrored at TSM level on the same
array
Disk Storage pool : 10GB+10GB+10GB+10GB+5GB=45GB on array B
TSM client: 4.1.2.12 ( Tivoli says 4.1.2.12 is not supported with 5.1
Server. But i could take the backup,archive and restore with this
combination )
Number of Clients : 55, all are windows
Incremental backup : 1GB/ client/day.
backup window : 9AM to 6PM with 50% randamization ( all are in polling mode
)
LAN : 100Mbps
End of the day only 10 clients could finish the backup.Remaining all are
missing or "?" ( in progress ) or failed.
Through the entire backup window the CPU load is 100% with dsmsvc.exe
holding 98%
I tested with various options. I stopped the schedular and fired 3 clients
backup manually at the same time.Each client has 1 GB of incremental data.
It took three hours to finish the backup. While backing up i observed there
was lot of idletime outs of sessions.
Network choke is not there. I checked this with FTP.
Whats the bottleneck here? Is RAID 5 is creating problems ( DB,log and
storage pool all are on the RAID 5 )? I asked the customer to arrange a
testing machine without any RAID. I will be getting that in two days.Before
going on to the testing i like to know your comments on this.
Regards
Raghu S Nivas
Consultant - TSM
DCM Data Systems Ltd
New Delhi
India.
