Specifications

Escala Tower PL & S, E, T System Hardware
Chapter 3: External Storage and SAN Subsystems 33/116
9es3s1c3.doc
Rev 5.9
02/12/2003
2.6. DAS5720 (Full Fibre RAID Disk Array Subsystems)
Discontinued: December 1999.
All addons discontinued as of 31/12/2002.
2.6.1. Highlights
The DAS5720 is a bundled product based on a dual SP DPE enclosure and a single DAE. It is
configured to offer a very attractive price for high availability configurations, with medium storage
resource requirement (20 disks). The Fibre Channel technology used for the host connection brings an
optimal cabling flexibility, and high transfer rates (up to 120 MB/s with dual SP).
The DAS5720 offers an excellent data protection solution for use with standalone servers, or as a
shared storage between multiple AIX servers and/or cluster nodes.
2.6.2. Configurability and Packaging
hi
g
h availabilit
y
confi
g
uration 2 SP
base cabinet 1 DPE + 1 DAE within a 20 slots cabinet
additional DAE 0
minimum number of disks 9. The DAE of the base cabinet is not connected to the DPE enclosure
minimum number of disks
p
er additional DAE 4 when the DAE of the base cabinet is reconnected to the DPE
maximum number of disks 20
memor
y
(MB) 64, same value on both SPs
write cache
y
es
p
ower su
pp
l
y
2
SPS 1 additional SPS o
p
tional for hi
g
her availabilit
y
ATF
y
es
For more information, refer to "2.1. Common Features of the DAS4500/5300/5700 and DAE 5000
Series" earlier in this chapter.
2.6.3. SAN features
One or multiple servers can be connected to a DAS5720 using the connectors of the SP (two
connectors per SP). External hubs or switches can be used to increase connectivity. MIA can be
plugged on the DAS connectors to enable longer distances with multimode optical fibers, or to connect
to devices with native optical interfaces. Disaster recovery configurations can be setup with external
copper to single mode converters. Several DAS5720 can be connected to a single HBA on a server
using external hubs.