HP P3410A HP NetRAID 1M/2M Installation & Configuration - Page 13

Chapter 1 Introduction SCSI Termination and Firmware Termination: Active termination on the SCSI bus conforms to Alternative 2 of the SCSI-2 specifications. Termination enable/disable is automatic through cable detection. Firmware: The HP NetRAID-1M and 2M firmware handles all RAID and SCSI command processing and also supports the following functions: • Disconnect/Reconnect feature optimizes SCSI Bus seek. • Tagged Command Queuing allows multiple commands to be sent to the controller, thus improving random access. • Scatter/Gather supports multiple address/count pairs. • Multi-threading supports up to 255 simultaneous commands with elevator sorting and concatenation of requests per SCSI channel. • Stripe size for each logical drive can be set from 2 KB to 128 KB. • Multiple rebuilds and consistency checks have user-definable priority. New Features of HP NetRAID-1M and 2M Adapters New features of HP NetRAID-1M and 2M adapters include: • Ultra3 SCSI support, with transfer rates up to 160 MB/sec for each channel • Greater number of disks per logical drive. All the physical disks attached to an adapter can now be combined into one logical drive-up to 12 disks for the HP NetRAID-1M and up to 24 disks for the two-channel NetRAID 2M. Older HP NetRAID adapters supported up to eight physical disks per logical drive. • RAID configurations containing up to 40 logical devices are now allowed with both the HP NetRAID-1M and 2M. Older HP NetRAID adapters supported up to eight logical drives. • Enhanced Array Spanning • Support for Clustering (HP NetRAID-2M only) 5