Hi We have a system configured as follows:
One P-Series 610 with dual 450 PowerPC processors 1GB RAM 2 18.2GB Ultra3 15K drives which are mirrored and contains AIX system and Tivoli logs 2GB Ultra3 15K drives which are mirrored and contains Tivoli database (30GB large) One IBM FibreChannel card One locally attached IBM Magstar 3575-L32 with 3 3570C drives. The system is attached to a SAN and has a dispool of totally 150GB on a Compaq FC disk cabinett. The system also is attached to a IBM 3584-L32 which as 2 SCSI drives connected through a IBM SAN Data Router (2108-R03) and one fibre attached LTO drive which is connected through a SAN switch(Compaq). The system uses 3 100Mbs Ethernet adapters, one which really are a Gigabit Ethernet card but is running at 100Mbs speed. When backup occurs, we have a good performance; normally about 15.000-16.000KB/s in Network speed, and about 6000-7000KB/s in Aggregate Transfer Rate. However, when the diskpool gets full in the middle of the night, and the TSM server starts migrating data to the drives in the 3584-L32, performance drops. We only get about 500KB/s-600KB/s throughput in the fibre attached drive. The AIX server however, has a good throughput through the FC adapter, and the Compaq disk cabinett has a throughput of about 10-14MB/s to the AIX server. If we do a storagepool backup from the 3575-L32 to the 3584-L32, the speed is good. If we do reclamation, or database backup, the speed of the FC drive is also good. Can this has something to do with the FC adapter? Should this configuration require 2 FC adapters? The first thing that hits me is that the FC adapter can't handle the throughput, doing both backup from clients to SAN attached disk, and doing migration from SAN attached disk to SAN attached drives. If we do a migration in the morning, when no backups are running, we get a speed of around 27MB/s on the fibre attached drive with compression. So, the FC drive has good performance, when no backups are running. Can somebody tell me whats wrong? Best Regards Daniel Sparrman ----------------------------------- Daniel Sparrman Exist i Stockholm AB Bergkällavägen 31D 192 79 SOLLENTUNA Växel: 08 - 754 98 00 Mobil: 070 - 399 27 51