Specifications

Escala Tower PL & S, E, T System Hardware
Chapter 3: External Storage and SAN Subsystems 13/116
9es3s1c3.doc
Rev 5.9
02/12/2003
2.1.3.4.3. Cooling Fans
DAE enclosures are equipped with a drive fan pack that cools the disk modules. The fan pack contains
3 fans. If a fan fails, the speed of the remaining fans increases to compensate. If needed (for example
to change a failed power supply), a fan pack can be removed for exchange operation while the storage
system continues to operate. The exchange operation, however, must not exceed two minutes,
otherwise disks will shut down.
2.1.3.4.4. Disk drives
The minimum number of disks per DAE enclosure depends on the number of LCCs. The maximum is
always 10 disks:
Minimum
(DAE enclosure)
Maximum
(DAE enclosure)
1 LCC 2 10
2 LCC 4 10
Notes:
•
The DAE 5000 (JBOD) is a DAE enclosure with a single LCC.
•
DAE enclosures in DAS RAID subsystems with a single SP have a single LCC. With dual SP, all
the DAE enclosures have also dual LCC.
2.1.3.5. Summary of high availability features
•
Dual port disks
•
Dual loops / LCCs
•
Dual Power supply with independent power cords
•
Redundant fans
•
No electronics in the chassis or backplane
•
All active components are hot plug.
2.1.3.6. Performance figures
The performance of the DAE enclosure is given by the performance of the individual disks that are in
the enclosure.
2.1.3.7. Technical specifications
Interface to host
Fibre Channel interfaces of 100 MB/s (1 LCC) or 200 MB/s (2 LCCs).
9-pin, DB9 shielded connector, compatible with copper/optical Media Interface Adapters (MIA).