Adaptec MAN-00005-UG, Инструкция по установке и эксплуатации

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80 Spheras Storage Director Installation and User Guide
• The Conservative Cache Mode Parameter is enabled for a dual-active controller
configuration, and a controller failure has occurred.
• A MORE
™
(Mylex
®
Online RAID Expansion) operation is initiated. During a
MORE operation, the system automatically enters into conservative cache
mode. After MORE completes, the system drives are restored to their original
settings.
• A Power supply has failed (not the removal of a power supply).
• When an enclosure supporting redundant power (multiple power supply
support) is operating on a single power supply.
• An out-of-limit temperature condition exists.
• The controller receives an indication of either an AC failure or a low battery
from a UPS.
• The external hardware input signal has been asserted to force the controller into
conservative cache mode.
Always use conservative cache mode Forces the controller into conservative cache mode regardless of its current
operating status. Conservative cache mode is used until you disable it by
unselecting this option.
Monitoring of Uninterruptible Power Supply (UPS) Enables monitoring of uninterruptible power supply if the system
enclosure supports it.
Smart large host transfers: When enabled, allows selection of Coalesce (fewer disconnects on large transfers)
on host data transfers. When disabled, allows as available more disconnects on host
data transfers. The Smart Large Host Transfers function takes effect for transfers
larger than the stripe size.
Operational fault management: This function should remain enabled during normal controller operation. Do not
disable this function unless specifically instructed to do so as part of a trouble
shooting diagnostic activity. Operational fault management allows the controller to
take autonomous actions when a failure occurs. This option monitors and reports
drive failures, background activity completion status, enclosure events, and so forth.
Note: A controller reset is required to make a change to this option take affect.
Automatic rebuild management: Works with SAF-TE and SES disk array enclosures to detect the removal of a failed
drive and automatically perform a rebuild after installation of a replacement drive.
Alternately, this function rebuilds to a drive that is assigned as a hot spare. The
controller performs a rebuild operation automatically when a disk drive fails and the
following conditions are true:
An online spare disk drive of identical or larger size is found attached to the same
controller.
The failed disk drive is removed and replaced with a disk drive of identical or larger
size.
All system drives that are dependent on the failed disk drive are configured as a
redundant array; RAID 1, RAID 3, RAID 5, or RAID 0+1.
The Automatic Rebuild Management controller parameter is enabled.
The Operational Fault Management controller parameter is enabled.
Coalesce device queues: Joins data from adjacent I/Os into a single I/O to improve performance.
Command queue limit: Maximum allowed queue depth for tagged commands to each attached drive.
Settings are from 1 (no tags) to 230.
Polling drives for predicted failures: When enabled (default), Predicted Drive Failures are written to the event log and
drive error handling settings are enabled.
Poll every: Settings are from 1 to 254 minutes. The default value is 30 minutes.