Linked by Thom Holwerda on Thu 6th Nov 2008 15:33 UTC, submitted by Gregory
It's no secret that SSDs suffer from performance penalties when it comes to small random writes. Even though more modern SSD try to solve some of these issues hardware-wise, software can also play a major role. Instead of resorting to things like delaying all writes until shutdown and storing them in RAM, SanDisk claims it has a better option. At WinHEC yesterday, the company introduced its Extreme FFS, which it claims will improve write performance on SSDs by a factor of 100.
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Member since:
2005-09-01
I guess this is exactly what UBIFS (and I guess Extreme FFS too) is supposed to do: treat whole FLASH as a huge log file registering all write operations and run garbage collection in some backroung thread to reclaim outdated entries. The block map resides in ram, is written to flash device on umount time but can always be rebuilt from the scattered logs (which contain enough metadata aside from content) in case of power failure.
This fully embraces FLASH performance specifics:
Slow inplace write + 0 seek time.