It seems that if the device is handled by the usb-storage driver, TRIM is as of this writing unsupported and likely to remain so.
usb/storage/scsiglue.c sets skip_vpd_pages to true, source/drivers/scsi/sd.c will not query for the necessary block limits to support discard if skip_vpd_pages is true. The bug poster should note per comment #1 in their dmesg excerpt that their device is using the usb-storage driver However, my Intel 530 SSD in the ASMT 2115 enclosure is acquired by the uas driver rather than usb-storage. TRIM is not supported there, possibly because of a failing in the bridge controller's translation of the SCSI unmap method to ATA TRIM. hdparm (and presumably blkdiscard, which I haven't tried) succeed because they use ATA commands directly without going through a SCSI translation layer either in usb-storage (disabled) or in the enclosure firmware (possibly broken?). -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1336541 Title: No TRIM via USB Status in linux package in Ubuntu: Confirmed Bug description: Hi, As USB attached SSDs are becoming quite big and affordable, along comes the idea of installing systems on these. But with current USB drivers, some functionality seems to be missing from USB subsystem. The system does not recognize it is an SSD, but it is corrected manually: # cat /etc/udev/rules.d/10-forcessd.rules SUBSYSTEM=="block", ATTRS{vendor}=="SanDisk", ATTRS{model}=="Extreme", KERNEL=="sd?", ATTR{queue/rotational}="0" # cat /sys/block/sdb/queue/rotational 0 Checked hdparm, it is saying I have TRIM on the device: # hdparm -I /dev/sdb /dev/sdb: ATA device, with non-removable media Model Number: SanDisk pSSD (...) Commands/features: Enabled Supported: (...) * Data Set Management TRIM supported (limit 8 blocks) * Deterministic read ZEROs after TRIM (...) Here is appropriate dmesg: [ 3.815604] usb 2-8: Manufacturer: SunplusIT INC. [ 4.122002] usb 3-3: new SuperSpeed USB device number 2 using xhci_hcd [ 4.138402] usb 3-3: New USB device found, idVendor=0781, idProduct=5580 [ 4.138404] usb 3-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 4.138405] usb 3-3: Product: Extreme [ 4.138406] usb 3-3: Manufacturer: SanDisk [ 4.138407] usb 3-3: SerialNumber: AA011109131654094942 [ 4.141393] usb-storage 3-3:1.0: USB Mass Storage device detected [ 4.141431] scsi0 : usb-storage 3-3:1.0 [ 4.141703] usbcore: registered new interface driver usb-storage And: [ 5.331311] sd 0:0:0:0: [sdb] 122544516 512-byte logical blocks: (62.7 GB/58.4 GiB) [ 5.331608] sd 0:0:0:0: [sdb] Write Protect is off [ 5.331611] sd 0:0:0:0: [sdb] Mode Sense: 33 00 00 08 [ 5.331855] sd 0:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA [ 5.339849] sdb: sdb1 sdb2 sdb3 < sdb5 > [ 5.340783] sd 0:0:0:0: [sdb] Attached SCSI disk From here I'll be using /boot formatted to ext4 to eliminate luks,lvm and btrfs from the equasion: # mount |grep sdb2 /dev/sdb2 on /boot type ext4 (rw,noexec,discard) # fstrim -v /boot/ fstrim: /boot/: FITRIM ioctl failed: Operation not supported # strace fstrim -v /boot/ (...) open("/boot/", O_RDONLY) = 3 ioctl(3, FITRIM, 0x7fffdded85c0) = -1 EOPNOTSUPP (Operation not supported) (...) During debugging, I've tried compiling a kernel with UAS module to check, it booted, system was g changed with the trim - as it wouldn't been used at all. Any ideas why TRIM is not working on USB? Any timeframes for possible fix? Any workarounds maybe? --- ApportVersion: 2.14.1-0ubuntu3.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: dome 2460 F.... pulseaudio /dev/snd/pcmC1D0p: dome 2460 F...m pulseaudio /dev/snd/controlC0: dome 2460 F.... pulseaudio DistroRelease: Ubuntu 14.04 HibernationDevice: RESUME=UUID=bafebd1d-6988-438f-afd4-b41bb8608616 InstallationDate: Installed on 2014-06-12 (56 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) MachineType: LENOVO 20AR001AUK Package: linux (not installed) ProcEnviron: LANGUAGE=en_US TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-24-generic root=/dev/mapper/system-root ro rootflags=subvol=@ cryptopts=target=crypter,source=/dev/disk/by-uuid/dc149cdf-62f9-4e29-a048-dd0403f51d56,lvm=system,discard quiet splash crashkernel=384M-:128M vt.handoff=7 ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-3.13.0-24-generic N/A linux-backports-modules-3.13.0-24-generic N/A linux-firmware 1.127.5 Tags: trusty Uname: Linux 3.13.0-24-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: _MarkForUpload: True dmi.bios.date: 03/28/2014 dmi.bios.vendor: LENOVO dmi.bios.version: GJET75WW (2.25 ) dmi.board.asset.tag: Not Available dmi.board.name: 20AR001AUK dmi.board.vendor: LENOVO dmi.board.version: 0B98401 PRO dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvrGJET75WW(2.25):bd03/28/2014:svnLENOVO:pn20AR001AUK:pvrThinkPadT440s:rvnLENOVO:rn20AR001AUK:rvr0B98401PRO:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 20AR001AUK dmi.product.version: ThinkPad T440s dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1336541/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
