Hello, Debian system, tested both Wheezy and Jessie, thus 3.16 kernel with backports. 8 SSD RAID5, of course with raid456.devices_handle_discard_safely set to 1. I can re-mount it with discard w/o a problem: --- EXT4-fs (md4): re-mounted. Opts: stripe=112,data=ordered,discard --- However fstrim whines about "FITRIM ioctl failed: Operation not supported" and mkfs.ext4 unsurprisingly doesn't discard things when invoked. The same HW/OS combo works fine with RAID10. When looking at the sysfs entries for that MD device the fact that /sys/class/block/md4/queue/discard_zeroes_data is 0 doesn't instill me with hope or confidence Now while the SSDs in question (Intel DC S3610s) don't really need TRIM really would have liked them to be able to start with a clean slate so to speak. Any insights? Christian -- Christian Balzer Network/Systems Engineer chibi@xxxxxxx Global OnLine Japan/Fusion Communications http://www.gol.com/ -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
