SATA: Difference between revisions

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Serial ATA is specified by the [http://www.sata-io.org/ SATA International Organization]; the most current revision as of 2009-12-31 is June 2009's SATA 3.0. Intel specifies the [http://www.intel.com/technology/serialata/ahci.htm Advanced Host Controller Interface]; as of 2009-12-31, the most recent revision is 1.3 ([[:File:AHCIrev1_3.pdf]]).

Serial ATA is specified by the [http://www.sata-io.org/ SATA International Organization]; the most current revision as of 2009-12-31 is June 2009's SATA 3.0. Intel specifies the [http://www.intel.com/technology/serialata/ahci.htm Advanced Host Controller Interface]; as of 2009-12-31, the most recent revision is 1.3 ([[:File:AHCIrev1_3.pdf]]). My [[growlight]] tool can provide a great deal of information about attached SATA devices.

==SAS==

An SFF-8087 connector can fan out to support up to 4 SATA devices.

==SSDs==

* Under ext4, the <tt>discard</tt> mount option must be provided to issue the TRIM command.

* TRIM support can be verified using <tt>hdparm -I</tt> (look under "Commands/Features")

** Btrfs doesn't require any option, supposedly. I don't yet use btrfs.

* GPT is recommended over MBR

* The <tt>noop</tt> I/O scheduler is supposedly superior to CFQ for some SSD's

** <tt>echo noop | sudo tee /sys/block/sdX/queue/scheduler</tt>, but I find this highly dubious

* Performance can drop after extensive use

** Use the secure erase functionality to reset the drive: see [http://forums.extremeoverclocking.com/showthread.php?t=333059 this link] at ExtremeOverclockers

** Again, [[growlight]] can help you here.

==Power Management==

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-Serial ATA is specified by the [http://www.sata-io.org/ SATA International Organization]; the most current revision as of 2009-12-31 is June 2009's SATA 3.0. Intel specifies the [http://www.intel.com/technology/serialata/ahci.htm Advanced Host Controller Interface]; as of 2009-12-31, the most recent revision is 1.3 ([[:File:AHCIrev1_3.pdf]]).
+Serial ATA is specified by the [http://www.sata-io.org/ SATA International Organization]; the most current revision as of 2009-12-31 is June 2009's SATA 3.0. Intel specifies the [http://www.intel.com/technology/serialata/ahci.htm Advanced Host Controller Interface]; as of 2009-12-31, the most recent revision is 1.3 ([[:File:AHCIrev1_3.pdf]]). My [[growlight]] tool can provide a great deal of information about attached SATA devices.
 ==SAS==
 An SFF-8087 connector can fan out to support up to 4 SATA devices.
 ==SSDs==
 * Under ext4, the <tt>discard</tt> mount option must be provided to issue the TRIM command.
+* TRIM support can be verified using <tt>hdparm -I</tt> (look under "Commands/Features")
 ** Btrfs doesn't require any option, supposedly. I don't yet use btrfs.
 * GPT is recommended over MBR
 * The <tt>noop</tt> I/O scheduler is supposedly superior to CFQ for some SSD's
 ** <tt>echo noop | sudo tee /sys/block/sdX/queue/scheduler</tt>, but I find this highly dubious
+* Performance can drop after extensive use
+** Use the secure erase functionality to reset the drive: see [http://forums.extremeoverclocking.com/showthread.php?t=333059 this link] at ExtremeOverclockers
+** Again, [[growlight]] can help you here.
 ==Power Management==

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