HP 4.8V Ni-MH 650mAh Raid Controller Battery For P410 P411 P212 HPN: 462969-B21
- Brand: HP
- Part #: 462969-B21,462976-001
- Specs:-
- Type: HP P410 Cache Battery
- Rating: 650mAh
- Voltage: 4.8V
- Compatible Models (not limited to)
- HP Smart Array P410 controller
- HP Smart Array P410i controller
- HP Smart Array P411 controller
- HP Smart Array P212 controller
- Condition: New sealed
- Warranty: 1 (one) year Tekmart Africa warranty
- INST: 251120003
- PSS: This Product is ELigible for Immediate Collection / Shipping Upon Order Confirmation
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Key points to note on these 462969-B21 HP Raid Controller Batteries:-
This is a genuine HP Smart Array 650mAh 4.8V Battery Module with Part #: 462976-001,462969-B21.
If an unexpected server shutdown occurs while data is held in BBWC, Smart Array controllers automatically signal the memory chips to enter a self-refresh state and the controller initiates battery power, or system auxiliary power if present. An amber LED, available either on the cache module or battery pack, begins flashing to indicate that data is trapped in the cache. Smart Array controllers automatically write this data to disk when power is restored to the system.
If power is not restored within the specified backup duration, the batteries may become drained of power. If that happens, posted-write data in the cache will be lost. Once system power is restored, the batteries will automatically recharge if needed. Battery recharge takes between 30 minutes and 2 hours, depending on the remaining capacity level.
The FBWC uses flash devices to retain cache data and super-capacitors (Super-caps) instead of batteries to provide power during a power loss. A BBWC must provide power during the entire power loss, while a FBWC only needs to provide power during the time to backup from DRAM to flash. The FBWC offers significant advantages over the HP Battery-backed write-cache (BBWC) system.
Since the FBWC writes the contents of memory to flash devices, there is no longer a 48-hour battery life limitation, and the data posts to the disk drive on the next power up.
HP Smart Array controllers include serviceable battery packs that allow tool-free battery pack replacement with no need to replace either the Smart Array controller or the detachable cache module.
If it is not possible or desirable to replace the batteries, you have three options to disable write-back cache and avoid losing critical data:
- :: Use the ACU to adjust the read-and-write cache ratio to 100 percent read cache.
- :: Use the ACU to disable the array accelerator for each logical drive, which disables both read-ahead and write-back cache.
- :: Replace an existing RAID controller with a newer Smart Array controller model
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Please note: If the write cache is off, some write performance degradation may occur.
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