IBM SAS RAID Series, Руководство пользователя

Страница: 12 / 72

Table 1. PCI-X SAS RAID controller card comparison
Features 572A 572C 572F and 575C 57B8
Description PCI-X 266 Ext
Dual-x4 3 Gb SAS
adapter PCI-X 266 planar 3
Gb SAS adapter PCI-X 266 Ext Tri-x4 3
Gb SAS RAID
adapter PCI-X 266 planar 3
Gb SAS RAID
adapter
Form factor Low profile 64 bit
PCI-X Planar integrated Long 64 bit PCI-X,
double-wide card set Planar RAID
enablement
Physical links 8 (two mini SAS 4x
connectors) 8
1
12 (bottom 3 mini
SAS 4x connectors)
and 2 (top mini SAS
4x connector for high
availability only) 8
1
RAID levels
supported RAID 5
3
, RAID 6
3
,
system mirroring
System mirroring RAID 5, RAID 6,
system mirroring RAID 5, RAID 6,
system mirroring
Write cache size Up to 1.5 Gb
(compressed) 175 MB
Read cache size Up to 1.6 Gb
(compressed)
Cache battery pack
technology Lithium ion Not applicable
2
Cache battery
concurrent
maintenance No No Yes
4
Not applicable
2
Cache data present
LED No No No No
Removable cache card No No No No
Auxiliary write cache
(AWC) support No No Yes Yes
Dual storage IOA
configuration No No Yes No
Requires dual storage
IOA configuration No No No No
1. Some systems provide an external mini SAS 4x connector from the integrated backplane controller.
2. The controller contains battery-backed cache, but the battery power is supplied by the 57B7 controller through
the backplane connections.
3. The write performance of RAID 5 and RAID 6 might be poor on adapters that do not provide write cache.
Consider using an adapter that provides write cache when using RAID 5 or RAID 6.
4. The cache battery pack for both adapters is contained in a single battery field-replaceable Unit (FRU), which is
physically located on the 575C Auxiliary Cache card.
Adapter graphics
View the SAS RAID controllers.
4
SAS RAID controllers for IBM i