Dot Hill Systems service manual Battery Module, SANnet II 200 FC Array Disk Drives

Caution – You can mix disk drive capacity in the same chassis, but not spindle speed (RPM). For instance, you can use 36-Gbyte and 73-Gbyte drives with no performance problems if both are 10K RPM drives. Violating this configuration guideline leads to poor performance.

In the event of a single disk drive failure, with the exception of RAID 0, the system continues to service all I/O requests. Either mirrored data or parity data is used to rebuild data from the failed drive to a spare drive, assuming one is assigned. If a spare is not assigned, you must manually rebuild the array.

In the unlikely event that multiple drive failures occur within the same logical drive, data that has not been replicated or backed up might be lost. This is an inherent limitation of all RAID subsystems and could affect application programs.

An air management sled FRU is available for use when you remove a disk drive and do not replace it. Insert an air management sled into the empty slot to maintain optimum airflow through the chassis.

1.2.3.1SANnet II 200 FC Array Disk Drives

The drives can be ordered in 36-Gbyte, 73-Gbyte, and 146-Gbyte sizes. 36-Gbyte drives have a rotation speed of 15,000 RPM, 146-Gbyte drives have a rotation speed of 10,000 RPM, and 73-Gbyte drives are available with rotation speeds of 10,000 RPM and 15,000 RPM.

1.2.3.2SANnet II 200 SATA and SATA SE Array Disk Drives

The disk drives incorporate Serial ATA (SATA) technology. They are optimized for capacity, but have performance levels approaching Fibre Channel performance levels. The drives can be ordered in 250-Gbyte and 400-Gbyte sizes and have a rotation speed of 7200 RPM.

1.2.4Battery Module

The battery module is designed to provide power to system cache for 72 hours in the event of a power failure. When power is reapplied, the cache is purged to disk. The battery module is hot-swappable. Hot-swappablemeans that a live upgrade can be performed. The FRU can be removed and replaced while the RAID array is powered on and operational. The battery module is mounted on the I/O board with guide rails and a transition board. It also contains the EIA-232 and DB9 serial interface (COM) ports.

1-10SANnet II 200 FC, SATA, and SATA SE Array Installation, Operation, and Service Manual • March 2005