sd 0:0:0:0: Optimal transfer size 33553920 bytes not a multiple of physical block size (4096 bytes) xhci-hcd xhci-hcd.0.auto: ERROR Transfer event for disabled endpoint or incorrect stream ring sd 0:0:0:0: Write cache: enabled, read cache: enabled, doesn't support DPO or FUA sd 0:0:0:0: Attached scsi generic sg0 type 0 |_ Port 3: Dev 5, If 0, Class=Mass Storage, Driver=uas, 5000M Lsusb and dmesg confirm this is an UAS/SCSI device: # lsusb -t * Data Set Management TRIM supported (limit 8 blocks) I checked, and hdpart indicates that the hardware should support TRIM: # hdparm -I /dev/sda | grep TRIM But when I mount it, I get this warning in dmesg: EXT4-fs (dm-0): mounting with "discard" option, but the device does not support discardĪnd fstrim fails: # fstrim /var/lib/postgresqlįstrim: /var/lib/postgresql: the discard operation is not supported I partitionned it with LVM (simple setup: a single PV, VG, and LV no encryption). I have an SSD (Samsung 860 EVO) attached via an USB-SATA adapter (I tried both this one and this one) to an ARM computer ( Odroid N2) running Armbian (Linux 4.9.180).
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