Hot-Swap Fan, Esm, And Power Supply Bays - IBM TotalStorage DS4000 EXP100 Installation, User's, And Maintenance Manual

Figure 2. Hot-swap fan, ESM, and power supply bays
v Hot-swap fan bays: The EXP100 has two interchangeable hot-swap and
v ESM bays: The EXP100 has two hot-swappable ESMs. The ESMs are located in
v Hot-swap power supply bays: The EXP100 has two hot-swap and redundant
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IBM TotalStorage DS4000 EXP100 Storage Expansion Enclosure: Installation, User's and Maintenance Guide
redundant fan units. These two fan units are located in the hot-swap fan bays.
Each fan unit contains two fans. If one fan unit fails, the second fan unit
continues to operate. You must install both fan units to maintain proper cooling
within your expansion enclosure, even if one fan unit is not operational.
The fan CRUs have locking latches that secure them to the fan bays. You must
unlock the latches before you can remove the fan from the expansion enclosure.
When you replace a fan, you must align it properly for the side in which it is
being replaced. See Figure 2.
the ESM bays. The ESMs provide a 1.5 Gbps Serial ATA interface to the drives
and monitor the overall status of the expansion enclosure. Each ESM has two
SFP module connector Fibre Channel ports that you use to connect your
expansion enclosure to the DS4000, or to connect two or more EXP100 units
together. The ESMs provide redundancy when both of them are configured into
redundant Fibre Channel loops.
Attention: See "ESM failover architecture" on page 24 for more information
about ESM redundancy and failover configurations.
After you remove an ESM, wait 70 seconds before reseating or replacing the
ESM. Failure to do so may cause undesired events.
The ESMs have locking latches that secure them to the ESM bays. You must
unlock the latches before you can remove the ESM from the expansion
enclosure.
power supplies. The power supplies are located in the hot-swap power supply
bays. You must install both power supplies in your expansion enclosure, even if
one power supply is not operational.
The power supplies have locking levers that secure them to the power supply
bays. You must unlock the levers before you can remove the power supply from
the expansion enclosure. The power supplies are interchangeable, but you must
mount the lever on the interior corner of the power supply CRU (that is, when
viewed from the back of the unit, the power supply CRU in the left power supply
bay has the lever mounted on the right side, and the one in the right power
supply bay has the lever mounted on the left side). See Figure 45 on page 84.
Hot-swap fan bays
Fan latches
ESM latches
ESM bays
1 Gb/s 2 Gb/s
X10 X1 Conflict
Tray Number
Hot-swap power
supply bays
Power supply locking levers