David Duchscher wrote: > On Dec 14, 2007, at 6:57 AM, Dag-Erling Smørgrav wrote: > >> David Duchscher <daved_at_tamu.edu> writes: >>> So does anybody know of a battery backed NVRAM card that can be used >>> with FreeBSD that the ZIL could be offloaded to? >> >> Any CF card or similar will do. You don't need battery backup for >> flash memory. > > I did think of that but is a CF card faster than a good SAS or SATA > drive? Not in transfer rate, but it could help hugely with seek-intensive IO loads (since seeks are instantaneous on flash or other solid-state drives). In theory, they could be of immense benefit for databases and seek-intensive operations on file systems, but the limited bulk transfer rates and relatively small sizes (for decent money) currently prevent their wide-spread use. It would be logical to use a limited size SSD for something like a file system journal for a large file system, except that these kind of journals are usually not seek-intensive :) > Fastest ones I found have a top rating of 45MB/s. The one > battery backed NVARM card that showed up in a google search had a peak > rate of 533MB/s. The question seems moot though since FreeBSD doesn't > currently support them. If a NVRAM or SSD, or other technology presents the drive as a (S)ATA drive, there's no reason it shouldn't.
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