Filter
Top Products
Hitachi Lightning 9900™ User and Reference Guide 21
2.3 Array Frame
The 9960 array frames contain the physical disk drives, including the disk array groups and
the dynamic spare disk drives. Each array frame has dual AC power plugs, which should be
attached to two different power sources or power panels. The 9960 can be configured with
up to six array frames to provide a storage capacity of up to 88 TB. The 9910 subsystem
combines the controller and disk array components in one physical frame.
The 9900 subsystem uses three-inch disk drives with fixed-block-architecture (FBA) format.
The currently available disk drives have capacities of 18 GB, 47 GB, 73 GB, 146 GB, and 180
GB. All drives in an array group must have the same capacity. The 18-GB, 47-GB, 73-GB, and
146-GB HDDs can be attached to the same ACP pair. The 180-GB HDDs should not be
intermixed with other HDD types behind the same ACP pair. Table 2.3 provides the disk drive
specifications.
Each disk drive can be replaced nondisruptively on site. The 9900 utilizes diagnostic
techniques and background dynamic scrubbing that detect and correct disk errors. Dynamic
sparing is invoked automatically if needed. For both RAID-5 and RAID-1 array groups, any
spare disk drive can back up any other disk drive of the same capacity anywhere in the
subsystem, even if the failed disk and the spare disk are in different array domains
(attached to different ACP pairs). The 9960 can be configured with a minimum of one and a
maximum of sixteen spare disk drives. The 9910 can be configured with a minimum of one
and a maximum of four spare disk drives. The standard configuration provides one spare
drive for type of drive installed in the subsystem. The Hi-Track
®
monitoring and reporting
tool detects disk drive failures and notifies the Hitachi Data Systems Support Center
automatically, and a service representative is sent to replace the disk drive.
Note: The spare disk drives are used only as replacements and are not included in the
storage capacity ratings of the subsystem.