Re: [PATCH 0 of 3] [RFC] I/O Hints

[Jamie Lokier <jamie@xxxxxxxxxxxxx>]

Martin K. Petersen wrote:
> Comments and suggestions are welcome.

Flash devices and SSDs (solid-state storage) in general are becoming
more common.

Also, backing a disk with flash.  And increasingly people will stripe,
parity, mirror or concatenate disks and flash just because it's
convenient.

--> So it would be nice if some of the flash alignment characteristics
could be reported.

Some aspects of flash don't fit into block devices - e.g. erase block
and write order requirements.  That's MTD stuff, not appropriate here.

But SSDs present a block device interface, and they still have
alignment characteristics for performance.  Even more important, when
combining multiple SSDs into a RAID.

-- Jamie
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