HP NetServer AA 6200 Backup/Recovery Guide for HP AA Solutions - Page 4

The following table lists the factors of tradeoff among the three configurations: Local Backup Semi-Local Backup Network Backup Backup Performance Centralization of Backup Installation / Configuration Gives best backup performance. No centralization. Requires separate management of multiple tape drives and multiple tape cartridges. If data set backed up is large, this can require significant IT operator time. Local backup requires a separate SCSI channel that is not shared with hard disks. A dedicated Tape SCSI HBA must be installed on Backup performance is good. But the virtual network (or an extra dedicated IOP network card) is relatively slow, the backup performance for the IOP disks is much less than the rated tape drive performance. This may be acceptable since the IOP, in general, has very little storage requirement. Also, IOPs are static in nature and they do not need to be backed up frequently. Overall, the impact is moderate. (A 500MB IOP can be backed up in as little as 20 minutes.) No centralization. Requires separate management of multiple tape drives and multiple tape cartridges. If data set backed up is large, this can require significant IT operator time. Semi-local backup on the internal SCSI channels is not recommended because normally both hot swap cages (for LH series) will be used and tape Slowest for backup performance. Backup network becomes a major additional factor that limits the throughput of backup. One should take into consideration the network bandwidth that is shared among many systems. Network backup allow a single backup server to backup all the systems from central a data center. Tape media management should be less and IT operator time is less, since autochangers hold more tape cartridges. Backup software aids in media management. Network backups requires two additional NICs in each IOP with two additional IP addresses to configure, one on each IOP and one on the CE. 12/08/99 Hewlett-Packard Co. 4