Log-structured file systems: There's one in every SSD
Log-structured file systems: There's one in every SSD
Posted Sep 22, 2009 5:22 UTC (Tue) by butlerm (subscriber, #13312)In reply to: Log-structured file systems: There's one in every SSD by jzbiciak
Parent article: Log-structured file systems: There's one in every SSD
Apparently Micron's flash chips have the ability to internally move data
around without having it leave the chip. No doubt very useful in this
application.
around without having it leave the chip. No doubt very useful in this
application.
Posted Sep 23, 2009 0:48 UTC (Wed)
by dwmw2 (subscriber, #2063)
[Link]
The 'read and then reprogram elsewhere from internal buffer' facility is all very well in theory, but your ECC is off-chip. So if you want to be able to detect and correct ECC errors as you're moving the data, rather than allowing them to propagate, then you need to do a proper read and write instead.
Linux has never bothered to use the 'copy page' operation on NAND chips which support it.
Not really.Log-structured file systems: There's one in every SSD