Ivan Voras wrote: > 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. That's no longer true. You can't get more than 5-10MB/s from seek-intensive RAID0 with two 15K drives, while 20-30MB/s is not a problem for the comparable priced/sized SSD drive. -MaximReceived on Sat Dec 15 2007 - 02:02:29 UTC
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