Filesystem fragmentation and scatter-gather DMA
Ric Wheeler
ric at emc.com
Mon Mar 17 13:45:54 UTC 2008
William Tambe wrote:
> Is the delay due to mechanical parts or the electronics gathering the fragments?
>
> Would that same delay still apply to a solid state drive? Since a
> solid state drive is really just a slower version of system memory
> (Please correct me if I am wrong).
>
With spinning media,the big cost is moving the physical heads of the drive.
With an SSD FLASH-based device, you might also prefer having contiguous
writes since flash needs to be erased before the write can happen (and
that occurs in chunks). Non-contiguous writes of single sectors would
have a high chance of causing extra erasures & read-modify-writes...
ric
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