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The HP Smart Array P822/2GB FBWC 2-ports Int/4-ports Ext SAS Controller is HP's 24 port Serial Attached SCSI (SAS) RAID controller with PCI-e 3.0. This high performance SAS RAID controller provides high levels of reliability for HP servers through its support of 6 Gb/s SAS and 6 Gb/s SATA technology, 2 GB FBWC, and advanced RAID capabilities. This controller ships standard with a Smart Array Advanced Pack 2.0 license key and supports up to 227 hard drives.
The P822 2GB array accelerator features a flash-backed write cache. If the cache DRAM contains write data
when power is lost, the write data is copied into flash memory chips on the cache module, drawing power
from attached capacitors. When power is restored, if the flash memory chips contain write data, the data is
copied back into the DRAM so it can be flushed to the drives.