On Mon, 2009-11-09 at 09:59 -0700, Chris Worley wrote:

On Mon, Nov 9, 2009 at 9:42 AM, Majed B. [off-list ref] wrote:

quoted

Well, SATA uses SCSI emulation so I guess that's no problem, right?

The only problem is SSD's put Solid State Storage (SSS) behind
SATA/SAS controllers... while compatible w/ old disk technology, it
severely limits performance (i.e. none of these SSD drives do even
300MB/s... while SSS drives do 800MB/s).  While the initial 2.6.27

No, around 280MB/s... and obviously they dont do more, because of the
simple limitation of the sata controllers.. this also means they dont
need to do as many channels as other devices..

drivers and ext4 "discard" worked very well with forward-thinking SSS
not encumbered by old controller technology... but, SSD's were not
able to handle it well:

http://lwn.net/Articles/347511/

So it looks like "design by committee" Linux is well behind Windows 7,

And how exactly does windows 7 handle this so much better?

while Linux contemplates slowing new technology down to optimize for
ill-designed SSD's.

It does?

Be glad "thumb drives" didn't try to be floppy-drive-compatible!!!

Chris

quoted

On Mon, Nov 9, 2009 at 7:37 PM, Chris Worley [off-list ref] wrote:

quoted

On Sun, Nov 8, 2009 at 6:13 PM, Majed B. [off-list ref] wrote:

quoted

The firmware which introduced the TRIM command was deemed buggy and
has been pulled out.

Are there any filesystems that are TRIM-aware?

Ext4 (at that level in the kernel, it's referred to as "discard", it's
not TRIM until it's issued as a SCSI command).

Chris

quoted

On Sun, Nov 8, 2009 at 8:57 PM, Bill Davidsen [off-list ref] wrote:

quoted

For those of us playing with use of SSD for journals on ext[34], this does
have implications for RAID performance.

http://hardware.slashdot.org/story/09/10/27/1427209/Intel-Updates-SSDs-Supports-TRIM-Faster-Writes

--
Bill Davidsen [off-list ref]
 Unintended results are the well-earned reward for incompetence.


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