90 lines
1.8 KiB
Markdown
90 lines
1.8 KiB
Markdown
## Recommended equipment
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#### Brand: UGREEN
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- **Port:** USB 3.0 2.5-Inch SATA
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- **Mode/PID:** CM237
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- **Main Controller:** ***ASM1153E***
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(Very important, not all drive support UAS, this Model CM237 has tested that was supported.)
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- **Support:** UAS Transfer Protocol
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----
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## OPEN Trim for external USB SSD
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#### 1. Check TRIM support
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```
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sudo fstrim -v /
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```
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**fstrim: /run/media/telgar/ssd: the discard operation is not supported**
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```
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$ lsblk --discard /dev/sda
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NAME DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO
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sdb 0 0B 0B 0
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├─sda1 0 0B 0B 0
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└─sda2 0 0B 0B 0
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```
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If the **DISC-MAX** value is **0B**, then TRIM is not **enabled**.
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#### 2. Enable TRIM
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Find the USB **idVendor** and **idProduct** :
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```
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$ lsusb
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...
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Bus 002 Device 002: ID 174c:1153 ASMedia Technology Inc. ASM1153 SATA 3Gb/s bridge
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...
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```
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Add **/etc/udev/rules.d/50-usb-ssd-trim.rules**
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```
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ACTION=="add|change", ATTRS{idVendor}=="174c", ATTRS{idProduct}=="1153", SUBSYSTEM=="scsi_disk", ATTR{provisioning_mode}="unmap"
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```
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Then reboot, the TRIM will be **enabled**.
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#### 3.Fstrim the SSD device
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1'st time, run "**fstrim -v /**" successfully:
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```
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$ sudo fstrim -v /
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/: 111.4 GiB (119574462464 bytes) trimmed
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```
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```
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$ lsblk --discard /dev/sdb
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NAME DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO
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sda 0 512B 4G 0
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├─sda1 0 512B 4G 0
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└─sda2 0 512B 4G 0
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```
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#### 4.Automatic trimming
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The last thing you will need to do to make sure the TRIM command is run automatically in the background
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(so you don't need to run fstrim manually) is to enable the built-in fstrim.timer.
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To do that, run the command:
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```
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$ sudo systemctl enable fstrim.timer
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```
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By default, it will run weekly.
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----
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All done.
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