User`s guide

5.9 Description of Device Warm Swap
Device warm swap is a sequence of quick removal and insertion steps, allowing
an operator to safely remove a device and insert another device in its place, or to
add a new device.
The reason for performing the following steps is to protect data integrity for
other shelf devices, and to reduce the chance of an operator causing a port
to be unusable for a long period of time (which could render several devices
inaccessible). Only one port may be quiesced at any time.
CAUTION
Never remove or add a device without using the device warm swap
procedure. Pulling a device directly from a shelf and/or replacing a device
without using the device warm swap procedure is not supported by Digital
and can cause the device to not be recognized by the controller.
Warm swap is not applicable to service on unpowered StorageWorks shelves. Do
not attempt to execute warm swap on an unpowered shelf.
5.9.1 Device Warm Swap
Devices can be safely removed and replaced without taking the system down or
taking the controller off line. The procedure is divided into removal (the steps
necessary before device removal) and replacement (the steps necessary before
device replacement).
Note
Device warm swap includes removing and replacing one device at a time.
Should another disk need to be removed, the entire warm swap procedure
must be repeated. Each step must be done in the order given to preserve
data integrity during normal operations.
You may also use the SBB warm swap procedure to add a device to an
empty shelf slot.
You need a 5/32-inch Allen wrench to open the doors of the cabinet (for SW800-
series cabinets). This is the only tool required for the device warm swap
procedure.
5.9.1.1 Disk SBB Warm Swap Removal
CAUTION
For all configurations except those using RAIDsets and mirrorsets, you
must dismount the units utilizing the affected devices by using your
operating system’s DISMOUNT command before beginning this procedure.
Perform this warm swap procedure EXACTLY as stated, or the controller
can perform unpredictably.
Refer to operating system-specific documentation for procedures necessary for
dismounting a device.
Controller Operations 5–27