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h1. Trim

h2. Проверка что SSD диск поддерживает TRIM

hdparm -I /dev/sda

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<pre>

/dev/sdc:

ATA device, with non-removable media

	Model Number:       OCZ-AGILITY3                            

	Serial Number:      OCZ-500DYX5125F39XRF

	Firmware Revision:  2.25    

	Transport:          Serial, ATA8-AST, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0

Standards:

	Used: unknown (minor revision code 0x0110) 

	Supported: 8 7 6 5 

	Likely used: 8

Configuration:

	Logical		max	current

	cylinders	16383	16383

	heads		16	16

	sectors/track	63	63

	--

	CHS current addressable sectors:   16514064

	LBA    user addressable sectors:  234441648

	LBA48  user addressable sectors:  234441648

	Logical  Sector size:                   512 bytes

	Physical Sector size:                   512 bytes

	Logical Sector-0 offset:                  0 bytes

	device size with M = 1024*1024:      114473 MBytes

	device size with M = 1000*1000:      120034 MBytes (120 GB)

	cache/buffer size  = unknown

	Nominal Media Rotation Rate: Solid State Device

Capabilities:

	LBA, IORDY(can be disabled)

	Queue depth: 32

	Standby timer values: spec'd by Standard, no device specific minimum

	R/W multiple sector transfer: Max = 16	Current = 16

	Advanced power management level: 254

	Recommended acoustic management value: 0, current value: 254

	DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6 

	     Cycle time: min=120ns recommended=120ns

	PIO: pio0 pio1 pio2 pio3 pio4 

	     Cycle time: no flow control=120ns  IORDY flow control=120ns

Commands/features:

	Enabled	Supported:

	   *	SMART feature set

	    	Security Mode feature set

	   *	Power Management feature set

	   *	Write cache

	    	Look-ahead

	   *	Host Protected Area feature set

	   *	WRITE_BUFFER command

	   *	READ_BUFFER command

	   *	NOP cmd

	   *	DOWNLOAD_MICROCODE

	   *	Advanced Power Management feature set

	    	Power-Up In Standby feature set

	   *	SET_FEATURES required to spinup after power up

	   *	48-bit Address feature set

	   *	Mandatory FLUSH_CACHE

	   *	FLUSH_CACHE_EXT

	   *	SMART error logging

	   *	SMART self-test

	   *	General Purpose Logging feature set

	   *	WRITE_{DMA|MULTIPLE}_FUA_EXT

	   *	64-bit World wide name

	   *	IDLE_IMMEDIATE with UNLOAD

	    	Write-Read-Verify feature set

	   *	{READ,WRITE}_DMA_EXT_GPL commands

	   *	Segmented DOWNLOAD_MICROCODE

	   *	Gen1 signaling speed (1.5Gb/s)

	   *	Gen2 signaling speed (3.0Gb/s)

	   *	Gen3 signaling speed (6.0Gb/s)

	   *	Native Command Queueing (NCQ)

	   *	Host-initiated interface power management

	   *	Phy event counters

	   *	Device automatic Partial to Slumber transitions

	   *	READ_LOG_DMA_EXT equivalent to READ_LOG_EXT

	   *	DMA Setup Auto-Activate optimization

	    	Device-initiated interface power management

	   *	Software settings preservation

	   *	SMART Command Transport (SCT) feature set

	   *	SCT Data Tables (AC5)

	   *	SET MAX SETPASSWORD/UNLOCK DMA commands

	   *	Data Set Management TRIM supported (limit 1 block)

	   *	Deterministic read data after TRIM

Security: 

	Master password revision code = 65534

		supported

	not	enabled

	not	locked

	not	frozen

	not	expired: security count

	not	supported: enhanced erase

	2min for SECURITY ERASE UNIT. 

Logical Unit WWN Device Identifier: 5e83a97e2d4e3c1f

	NAA		: 5

	IEEE OUI	: e83a97

	Unique ID	: e2d4e3c1f

Checksum: correct

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kernel

LVM 2.02.85

Утилита fstrim

util-linux 2.19

Утилита blkdiscard

util-linux 2.23