Оценок - 2, средний балл: 4.5
(
)
)
|
Фрагмент инструкции
The difference is in battery implementation: . The battery in the BBU offering retains the data in cache in the event of a power cycle for a guaranteed period of 24 hours (typically up to 72 hours). . The battery in the NV cache offering will transfer the data from cache to flash in the event of a power cycle, where the data will be retained for up to ten years. 4.5.2 Automatic Replace Member with Predicted Failure A Replace Member operation can occur when there is a SMART predictive failure reporting on a drive in a virtual disk. The automatic Replace Member is initiated when the first SMART error occurs on a physical disk that is part of a virtual disk. The target drive needs to be a hot spare that qualifies as a rebuild drive. The physical disk with the SMART error is marked as failed only after the successful completion of the Replace Member. This avoids putting the array in degraded status. If an automatic Replace Member occurs using a source drive that was originally a hot spare (that was used in a rebuild), and a new drive added for the Replace Member operation as the target drive, the hot spare reverts to the hot spare state after a successful Replace Member operation. To enable the automatic Replace Member, use the Dell OpenManage storage management application. 4.5.3 Redundant Path with Load Balancing Support The PERC H800 adapter can detect and use redundant paths to drives contained in enclosures. This provides the ability to connect two SAS cables between a controller and an enclosure for path redundancy. The controller is able to tolerate the failure of a cable or Enclosure Management Module (EMM) by using the remaining path. When redundant paths exist, the controller automatically balances I/O load through both paths to each disk drive. This load balancing feature increases throughput to each drive and is automatically turned on when redundant paths are detected. To set up your hardware to support redundant paths, see the Setting up Redundant Path Support on the PERC H800 Adapter section in the PERC H700 and PERC H800 User’s Guide (support.dell.com/manuals). 4.5.4 Failed Physical Disk Detection The controller automatically detects and rebuilds failed physical disks when you place a new drive in the slot where the failed drive resided or when an applicable hot spare is present. Automatic rebuilds can be performed transparently with hot spares. If you have configured hot spares, the controllers automatically try to use them to rebuild failed physical disks. 4.5.5 Using Replace Member and Revertible Hot Spares The Replace Member functionality allows a previously commissioned hot spare to be reverted back to a usable hot spare. When a drive failure occurs within a virtual disk, an assigned hot spare (dedicated or global) is commissioned and begins rebuilding until the virtual disk is optimal. After the failed drive is replaced (in the same slot) and the rebuild to the hot spare is complete, the controller automatically starts to copy data from the commissioned hot spare to the newly inserted drive. After the data is copied, the new drive is part of the virtual disk and the hot spare is reverted back to being a ready hot spare. This allows hot spares to remain in specific enclosure slots. While the controller is reverting the hot spare, the virtual disk remains optimal. The controller automatically reverts a hot spare only if the failed drive is replaced with a new drive in the same slot. If the new drive is not placed in the same slot, a manual Replace Member operation can be used to revert a previously commissioned hot spare. 4.5.6 Enclosure Affinity Enclosure affinity is used to set the preference for a hot spare to be used to rebuild a physical disk that resides in the same physical enclosure. This does not preclude the hot spare from being provisioned to a second enclosure if there are no other hot spares present. For example, if there are two enclosures and each enclosure has a hot spare with affinity set, then upon a drive failure the hot spare will be provisioned from the same enclosure as the failed drive. Hot-spare enclosure affinity can be configured only if you are using an external storage enclosure. 4.5.7 Battery Back-up of Controller Cache 4.5.7.1 Battery Management The transportable battery backup unit (TBBU) is a cache memory module with an integrated battery pack that enables you to transport the cache module with the battery in a new controller. The TBBU protects the integrity of the cached data on the PERC H800 adapter by providing backup power during a power outage. The battery backup unit (BBU) is a battery pack that protects the integrity of the cached data on the PERC H700 cards by providing backup power during a power outage. The battery provides up to 24 hours of backup power for the cache memory. 4.5.7.2 Battery Learn Cycle Learn cycle is a battery calibration operation performed by the controller periodically to determine the condition of the battery. This operation can...
Эта инструкция также подходит к моделям:Компьютерные аксессуары - POWEREDGE RADI H700 (950.42 kb)