[mythtv-users] EXT4 vs XFS
myth at robinhill.me.uk
Thu Nov 17 18:11:09 UTC 2011
On Thu Nov 17, 2011 at 12:59:02 -0500, Mark Lord wrote:
> On 11-11-17 05:24 AM, phipps-hutton at sky.com wrote:
> > Wear and tear:
> > TRIM support means that the kernel tells the drive controller that a
> > sector is unused and the kernel will not expect the sector contents to
> > be preserved. That's all it does. SSD controllers use this information
> > to erase the sectors and put them on the list of erased sectors. They
> > do this when they have nothing to do and they maintain the list in
> > permanent storage...
> That's certainly a good guess at what happens, and it's exactly what
> just about all of us expected. Until some of us actually tried it
> and measured things.
> Most SSDs (but not all) perform immedate erase cycles in response to TRIM,
> and those are done synchronously (blocking other I/O until done).
TRIM is also a non-queueable command, requiring a complete flush of the
command queue before the TRIM command can be sent,
( ' } | Robin Hill <myth at robinhill.me.uk> |
/ / ) | Little Jim says .... |
// !! | "He fallen in de water !!" |
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