HP LC2000r HP NetRAID 1M/2M Installation & Configuration - Page 14

Chapter 1 Introduction Enhanced Array Spanning The HP NetRAID-1M and 2M adapters allow up to eight arrays to be spanned together as one logical drive, although all the disks in the logical drive must be connected to the same adapter. The maximum number of disks connected to one adapter depends on the number of channels (one or two) and whether you are using the internal or external SCSI connectors. Maximum Number of Disk Drives Connected to the HP NetRAID-1M or 2M Adapter Model 1M 2M Using Internal Connectors 6 or fewer 12 or fewer Using External Connectors* 12 or fewer 24 or fewer * External storage with HP Rack Storage/12 supports a maximum of 12 Ultra3 SCSI disk drives. Support for Clustering The HP NetRAID-2M adapter can be used as a shared storage controller in HP Netserver cluster configurations. HP Netserver clusters provide reliable, increased-availability solutions for applications where unplanned downtime is unacceptable. Either the HP NetRAID-1M or the HP NetRAID-2M adapter can be used as a local storage controller. For complete information on clustering, visit the HP Netserver Clustering Solutions web site at: http://netserver.hp.com/netserver// Physical Disk Roaming and Data Migration HP NetRAID-1M and 2M adapters allow physical disk roaming, in which the adapter keeps track of disk modules if they are moved to different slots in the hot-swap cages, as long as the slots are all controlled by the same adapter. With the exception of the NetRAID-4M, all disk modules on older adapters can be moved to HP NetRAID-1M and 2M adapters, without losing data readability. 6