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Flash and small modificationsFlash and small modificationsPosted Apr 6, 2012 18:07 UTC (Fri) by dlang (✭ supporter ✭, #313)In reply to: Flash and small modifications by valyala Parent article: 2012 Linux Storage, Filesystem, and Memory Management Summit - Day 2
if they are buffered by on-board ram, then they are going to be lost if the device looses power. As such they can not be suitable for things like journal writes.
unless the device includes an on-board battery with enough power to write the contents of the ram to flash when it losses power, and I am not aware of any SSD drives that do this.
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Flash and small modifications Posted Apr 6, 2012 18:09 UTC (Fri) by dlang (✭ supporter ✭, #313) [Link]
Also, any buffering by on-board ram will only help if the additional write happens in a short enough time that the data is still in ram.
Think of a log file that gets a new line written to it every minute or two. If the average log line is ~1/4K (which is what I measured my logs to be), then you have about 2K log entries per block, and so will re-write the block 2K times before filling it up.
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