HP 353803-B22 - StorageWorks Modular Smart Array 1000 SAN Starter Manuel de référence - Page 20

Parcourez en ligne ou téléchargez le pdf Manuel de référence pour {nom_de_la_catégorie} HP 353803-B22 - StorageWorks Modular Smart Array 1000 SAN Starter. HP 353803-B22 - StorageWorks Modular Smart Array 1000 SAN Starter 48 pages. Storageworks modular smart array controller, cache, and battery replacement instructions
Également pour HP 353803-B22 - StorageWorks Modular Smart Array 1000 SAN Starter : Manuel d'administration (40 pages), Note de mise à jour (13 pages), Instructions de démarrage rapide (8 pages), Note de mise à jour (8 pages), Note de mise à jour (8 pages), Manuel de démarrage rapide (7 pages), Note de mise à jour (5 pages), Instructions de remplacement (4 pages)

MSA1000 Hardware Components

The read-ahead cache detects sequential accesses to the array, reads ahead data,

and stores the data in the cache until the next read access arrives. If the data is of a

sequential nature, the data can be loaded immediately into memory, avoiding the

latency of a disk access.

If the MSA1000 Controller fails before cached data is stored on the disk, the

Array Accelerator and its integrated batteries may be removed from one

MSA1000 Controller and installed on a replacement controller. Any data in the

Array Accelerator that has not been written to the hard drive will be transferred to

the replacement MSA1000 Controller.

Array Accelerator Features:

Other features of the Array Accelerator:

■

The Array Accelerator has two rechargeable and replaceable Nickel Metal

Hydride (NiMH) battery packs. Under normal operating conditions, these should

last for three years before replacement is necessary. They are continuously

recharged via a "trickle" charging process whenever the MSA1000 storage system

is powered on.

The battery packs protect data on the Array Accelerator against equipment failure

or power outage for up to four continuous days.

Note:

Mounted on a removable daughterboard (allows stored data to be moved to

another controller if the original controller fails)

Backed up with replaceable batteries

Upgradable to 512 MB (256 MB per controller)

Adjustable read/write ratio - usually set during array configuration but can be

changed at any time

16-bit Error Checking and Correcting (ECC) SDRAM memory

ECC detects and corrects all single-bit memory errors. It also detects all

two-bit memory errors in any position, and most three- and four-bit memory

errors in a single SDRAM. With ECC, an entire memory chip can also fail

without data loss. This provides a high level of data integrity by ensuring the

correction of common memory errors without affecting performance.

Temperature, age, and cache size may affect battery life.

HP StorageWorks 1000 Modular Smart Array Reference Guide