Preliminary Information For Enabling and Disabling NVRAM

• Fast writes can be configured: at the controller level, in which case fast writes are set for all drives in the SPARCstorage Array; at the tray level, affecting all drives in a single tray; or at the drive level, setting fast write for that individual drive.

• When fast write is enabled, it is saved as part of the SPARCstorage Array's configuration--across power cycles.

• If the NVRAM battery is low, missing, or has failed, the menus will be disabled, because fast write is disabled on the controller under these conditions.

• Before enabling fast write, quiesce all I/O to the controller, tray, or disk. Be sure that no I/O is active on metadevices that exist on disks within a SPARCstorage Array. In particular, insure that ownership of any diskset metadevices has been released since an implicit I/O stream exists while ownership of a diskset is maintained. Refer to "Working With Disksets" for details of taking and releasing ownership of a diskset.