Dell PowerVault 221S (SCSI) - Manual (Page 37)

A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02
PAGE 37 11/17/2005
Table 5-2 – Controller Families and Features: Part 2
PERC 4/SC PERC 4/DC PERC 3/SC PERC 3/DCL
SCSI
Technology
Wide Ultra320 Wide Ultra320
Wide Ultra3 /
U160 Wide Ultra3 /
U160
Host Bus
Interface 64-bit / 66 MHz
PCI 2.2 (HBA) 64-bit / 66 MHz
PCI 2.2 (HBA) 64-bit / 66 MHz
PCI 2.2 (HBA) 64-bit / 66 MHz
PCI 2.2 (HBA)
# Channels 1 2 1 2
# internal
connectors
2 x 68-pin HD 2 x 68-pin HD 1 x 68-pin HD 2 x 68-pin HD
# External
Connectors
1 x 68-pin UHD 2 x 68-pin UHD 1 x 68-pin UHD 2 x 68-pin UHD
RAID Levels
Supported
0, 1, 5, 10, 50 0, 1, 5, 10, 50 0, 1, 5, 10, 50 0, 1, 5, 10, 50
Cluster
Support?
no yes no No
Cache Size
(DIMM)
64 MB 128MB 64 or 128MB 64 or 128MB
Write Cache
Options
off, write-
through,
write-back off, write-
through,
write-back off, write-
through,
write-back off, write-
through,
write-back
Read Cache
Options
read-ahead
(default), off
(selectable) read-ahead
(default), off
(selectable) read-ahead
(default), off
(selectable) read-ahead
(default), off
(selectable)
BBU Battery Life no BBU 48-72 hours no BBU no BBU
Max # Logical
Drives/Controller
40 40 40 40
Max # Physical
Drives/Logical
Drive
32 32 32 32
Vendor LSI LSI LSI (AMI) LSI (AMI)
SCSI Chip LSI 53C1020 LSI 53C1030 Qlogic 12160 Qlogic 12160
RAID Processor Intel GC80302 Intel GC80303 Intel i960 Intel i960