Even though there may be a slight performance hit on writes, I've placed the TSM DB on RAID-5 to ensure availability and no down time in case of a disk loss.
>>> [EMAIL PROTECTED] 10/22/02 08:03AM >>> 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.