Hitachi AMS 2100, Hardware Manual

Page: 286 / 306

Specifications
A–4
Hitachi AMS 2100/2300 Storage System Hardware Guide
•
Cache specifications
The cache specifications are shown in Table A-6 .
s
Table A-5: Ethernet Specifications
Parameter Specification
Works with switches that comply to
the following standards: IEEE 802.1D STP
IEEE 802.1w RSTP
IEEE 802.3 CSMA/CD
IEEE 802.3u Fast Ethernet
IEEE 802.3z 1000BaseX
IEEE 802.1Q Virtual LANs
IEEE 802.3ad Dynamic LACP
RFC Channel 768 UDP
RFC Channel 783 TFTP
RFC Channel 791 IP
RFC Channel 793 TCP
RFC Channel 1157 SNMP v1
RFC Channel 1213 MIB II
RFC Channel 1757 RMON
RFC Channel 1901 SNMP v2
Cable Type RJ-45 1000BASE-TX UTP or STP (STP is
recommended)
Table A-6: Cache Specifications
Item Base Unit
AMS 2100
Capacity
(MB per controller) 2,048, 4,096
Control method Read LRU / Write After
1
Battery backup Provided
Backup duration (h)
2
48 hrs when cache is 8,192 MB (4,096 MB per controller)
72 hrs when cache is 4,096 MB (2,048 MB per controller)
AMS 2300
Capacity
(MB per controller) 4,096, 8,192 MB
Control method Read LRU / Write After
1
1.LRU = Least Recently Used. It is an algorithm where new items are placed at
the top of the cache and items at the bottom of the cache are discarded when
the cache grows past its size limit. Whenever an item is accessed, it is pulled
back to the top of the cache.
Battery backup Provided
Backup duration (h)
2
2.Backup time in hours with two full charged cache backup batteries.
24 hrs when cache is 16,384 MB (8,192 MB per controller
36 hrs when cache is 8192 MB (4,096 MB per controller)