Bug 83181
| Summary: | TRIM/discard fails when using TRIM enabled USB memory sticks (and USB3-SATA2 adaptors) | ||
|---|---|---|---|
| Product: | IO/Storage | Reporter: | John (ted) |
| Component: | Other | Assignee: | io_other |
| Status: | NEW --- | ||
| Severity: | normal | CC: | ralph, sven.koehler, szg00000 |
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Kernel Version: | 3.15.10-200.fc20.x86_64 | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
The referenced launchpad bug suggests hdparm(8)'s --trim-sector-ranges works because it uses ATA commands directly. fstrim(8) fails, even with ATA-passthrough SCSI command that lets smartctl(8) work, due to lack of usb-storage driver support. Interesting comments start at #18 (no anchor available!) at https://bugs.launchpad.net/ubuntu/+source/linux-lts-xenial/+bug/1336541 Could someone knowledgeable in the this area take a look and the comments and give a summary of the problem. Perhaps it can then be moved off the `io_other' component. |
On a fully updated F20 machine hdparm shows that TRIM is supported on this Corsair USB stick but both "fstrim" and "mount -o discard" commands fail I have replicated the problem using an Addonics eSATAp to USB3 adaptor and a modern SSD. ioctl/FITRIM problem Details ja@paxos ~ 1$ uname -a Linux paxos 3.15.10-200.fc20.x86_64 #1 SMP Thu Aug 14 15:39:24 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux [root@paxos:~]$ hdparm -I /dev/sdb ATA device, with non-removable media Model Number: Voyager GTX Serial Number: FF1807470C0800110923 Firmware Revision: S9FM01.7 Transport: Serial, ATA8-AST, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0 ... * Data Set Management TRIM supported (limit 8 blocks) ... ------------------------------------------------------------------------ root@paxos:~]$ mount |grep sdb /dev/sdb1 on /media/gtx type ext4 (rw,nosuid,nodev,noexec,noatime,seclabel,discard,data=ordered) //----------------------------------------------------------------- dmesg -ew [Aug23 08:45] EXT4-fs (sdb1): mounting with "discard" option, but the device does not support discard [ +0.000002] EXT4-fs (sdb1): mounted filesystem with ordered data mode. Opts: discard [ +0.000004] SELinux: initialized (dev sdb1, type ext4), uses xattr //----------------------------------------------------------------- [root@paxos:~]$ cat /sys/block/sdb/queue/rotational 0 //----------------------------------------------------------------- [root@paxos:~]$ fstrim -v /media/gtx fstrim: /media/gtx: discard operation not supported. //----------------------------------------------------------------- [root@paxos:~]$ strace fstrim /media/gtx ... stat("/media/gtx", {st_mode=S_IFDIR|0777, st_size=4096, ...}) = 0 open("/media/gtx", O_RDONLY) = 3 ioctl(3, FITRIM, 0x7fffee2fb700) = -1 EOPNOTSUPP (Operation not supported) ... The latest references to the problem that I can find are given here https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1336541 http://askubuntu.com/questions/262154/trim-and-ssd-with-usb-3-0-enclosure-does-not-work-uasp-not-supported but I can find no reference to a likely, timely solution