Sun Microsystems StorageTek 6140 Array Release Notes page 55

Caution – Potential data loss – Moving a array or array components that are
configured as part of a volume group can result in data loss. To prevent data loss,
always consult a Customer Support representative before relocating configured
drives, controller trays or expansion trays.
Note – Trays in arrays can be connected to the DC power supply (–48 VDC). Before
turning off any power switches on a DC-powered tray, you must disconnect the two-
pole 20-amp circuit breaker.
Do not move controller trays or expansion trays that are part of a volume group
configuration. If you must move array components, contact a Customer Support
representative for procedures. A Customer Support representative might direct you
to complete several tasks prior to undertaking the relocation. These tasks might
include:
Creating, saving, and printing an array profile of each storage array that is
■
affected by the relocation of a drive or tray.
Performing a complete backup of all data on the drives that you intend to move.
■
Verifying that the volume group and each of its associated volumes on the
■
affected array have an Optimal status.
Determining the location and status of any global hot spares associated with the
■
affected storage array.
Chapter B Using DC Power 47