ssd trim

[rbrick49]

I have CentOS 7 installed on an intel ssd how do I check to see if trim is working on my system.my system is uefi sda1 fat 210 mb,sda2 xfs 524 MB,sda3 linux lvm 239GB

[toracat]

What is the output of :

cat /sys/block/sda/queue/discard_max_bytes
or
cat /sys/block/sda/queue/discard_granularity
(provided your device is sda)

If it is non-zero, discard operations are supported.

[rbrick49]

non zero heres the output
[rbrickle@localhost ~]$ cat /sys/block/sda/queue/discard_max_bytes
2147450880
[rbrickle@localhost ~]$ cat /sys/block/sda/queue/discard_granularity
512

[toracat]

Then try and run the fstrim command. For example, I have a filesystem /home, so:

Code: Select all

$ sudo fstrim -v /home
/home: 20404355072 bytes were trimmed
$ sudo fstrim -v /home
/home: 0 bytes were trimmed

[rbrick49]

I am not getting the sama as you toracat
[rbrickle@localhost ~]$ sudo fstrim -v /home
[sudo] password for rbrickle:
/home: 156.9 GiB (168449187840 bytes) trimmed
[rbrickle@localhost ~]$ sudo fstrim -v /home
/home: 156.9 GiB (168449163264 bytes) trimmed

[toracat]

Can you show us the output from:

sudo blkid
df -h

[rbrick49]

[rbrickle@localhost ~]$ sudo blkid
[sudo] password for rbrickle:
/dev/sde1: UUID="2111-E051" TYPE="vfat" PARTUUID="e3851e1f-b08c-4d15-b102-66fad55e2907"
/dev/sde2: UUID="56ab111e-5ff5-45bd-8480-23aa0deccb97" TYPE="ext4" PARTUUID="e5c0a833-3d14-4123-985b-1d6fab18353a"
/dev/sde3: UUID="7c04b0e2-18a6-404c-a4c5-7a8a369d7d77" TYPE="swap" PARTUUID="7c257e6a-f923-48a8-bd4c-ad03cbeb5c1f"
/dev/sdc1: LABEL="New Volume" UUID="28FA3194FA315EEE" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="a97789ae-9da2-4ebc-ab74-24ff77380f08"
/dev/sdd1: SEC_TYPE="msdos" UUID="5E7A-DC92" TYPE="vfat" PARTLABEL="EFI System Partition" PARTUUID="c9e8fc4a-af98-47d2-8fba-48d5df379f22"
/dev/sdd2: UUID="42ff6b03-285b-42e5-97ae-c976afb553d7" TYPE="ext4" PARTUUID="af69142c-bd7e-4954-9f95-1c3f352c3093"
/dev/sdd3: UUID="ZDhzlQ-egAT-8RxC-rpei-TLIR-HLC0-XaMuRz" TYPE="LVM2_member" PARTUUID="a79e3701-a2c7-4c47-afed-9c133929b806"
/dev/sda1: SEC_TYPE="msdos" UUID="BAF2-C47D" TYPE="vfat" PARTLABEL="EFI System Partition" PARTUUID="cd72f7b1-a1c3-465c-882c-b475c0a63205"
/dev/sda2: UUID="f3163e53-d327-4e16-917f-5efea67857c1" TYPE="xfs" PARTUUID="0d2730d5-f63f-4ccc-9b87-015044be1522"
/dev/sda3: UUID="JMRwLn-kKcv-h6L4-rTc4-Ahbz-nFef-C93dez" TYPE="LVM2_member" PARTUUID="617823c5-1c57-482d-9629-bb5c662b00bf"
/dev/sdb1: SEC_TYPE="msdos" UUID="71D9-1BD8" TYPE="vfat" PARTLABEL="primary" PARTUUID="7c76a58b-b84c-4ded-84ba-b3092f0adb4a"
/dev/sdb2: UUID="S3iK5q-wsr6-niPd-lUhH-PCy5-29Gl-0tG7ex" TYPE="LVM2_member" PARTLABEL="primary" PARTUUID="a00cd324-405b-4b1d-ad85-1e4f64b55e72"
/dev/mapper/centos-swap: UUID="fa992708-73ae-495c-804f-568c94a2daa9" TYPE="swap"
/dev/mapper/centos-root: UUID="9168cb3f-e517-4130-a7d9-8b846f3881e0" TYPE="xfs"
/dev/mapper/fedora-swap: UUID="cf4bffe8-bc69-4f9c-a91b-1b6c6b9e25cd" TYPE="swap"
/dev/mapper/system-home: UUID="888f970e-babd-4f30-97f7-979da20c8b00" TYPE="ext4"
/dev/mapper/system-root: UUID="f164aeb0-dd21-4659-bdaa-d1ea9c45e2ad" TYPE="ext4"
/dev/mapper/fedora-home: UUID="782b4ffc-4735-40e8-848d-c7aa5313fd3d" TYPE="ext4"
/dev/mapper/fedora-root: UUID="5231a0f6-2a95-4886-9e02-66bacbda0e43" TYPE="ext4"
/dev/mapper/centos-home: UUID="cfab19b6-7fec-4493-8336-d49f155059d8" TYPE="xfs"
/dev/sr2: UUID="2011-09-13-12-00-00-00" LABEL="Mobile Partner" TYPE="iso9660" PTTYPE="mac"
[rbrickle@localhost ~]$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 50G 4.6G 46G 10% /
devtmpfs 16G 0 16G 0% /dev
tmpfs 16G 2.6M 16G 1% /dev/shm
tmpfs 16G 9.1M 16G 1% /run
tmpfs 16G 0 16G 0% /sys/fs/cgroup
/dev/sda2 497M 153M 345M 31% /boot
/dev/sda1 200M 9.6M 191M 5% /boot/efi
/dev/mapper/centos-home 158G 565M 157G 1% /home
/dev/sdc1 932G 28G 904G 3% /run/media/rbrickle/New Volume
here you go

[rbrick49]

I just installed hdparm heres the result from hdparm sda the ssd I have centos installed on
[root@localhost ~]# /sbin/hdparm -I /dev/sda

/dev/sda:

ATA device, with non-removable media
Model Number: INTEL SSDSC2BW240A4
Serial Number: CVDA409601GG2403GN
Firmware Revision: DC32
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 0xffff)
Supported: 9 8 7 6 5
Likely used: 9
Configuration:
Logical max current
cylinders 16383 16383
heads 16 16
sectors/track 63 63
--
CHS current addressable sectors: 16514064
LBA user addressable sectors: 268435455
LBA48 user addressable sectors: 468862128
Logical Sector size: 512 bytes
Physical Sector size: 512 bytes
Logical Sector-0 offset: 0 bytes
device size with M = 1024*1024: 228936 MBytes
device size with M = 1000*1000: 240057 MBytes (240 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
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
* 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_UNCORRECTABLE_EXT command
* {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
* DMA Setup Auto-Activate optimization
Device-initiated interface power management
* Software settings preservation
unknown 78[8]
* SMART Command Transport (SCT) feature set
* SCT Write Same (AC2)
* SCT Data Tables (AC5)
* reserved 69[4]
* Data Set Management TRIM supported (limit 1 block)
* Deterministic read data after TRIM
Security:
Master password revision code = 65534
supported
not enabled
not locked
frozen
not expired: security count
supported: enhanced erase
4min for SECURITY ERASE UNIT. 2min for ENHANCED SECURITY ERASE UNIT.
Logical Unit WWN Device Identifier: 55cd2e404b96fbc4
NAA : 5
IEEE OUI : 5cd2e4
Unique ID : 04b96fbc4
Checksum: correct

[rbrick49]

thanks

[screwballl]

yum install hdparm

hdparm -I /dev/sda (that is a capital i)

Look at one of the last lines:

* Data Set Management TRIM supported (limit 1 block)

As long as it has the asterisk there then it is supported and enabled.