On Thu, 5 May 2011, Karel Zak wrote: > On Wed, May 04, 2011 at 11:16:05AM -0400, Martin K. Petersen wrote: > > >>>>> "Lukas" == Lukas Czerner <lczerner@xxxxxxxxxx> writes: > > > > I got tired of poking around in sysfs to find the discard topology. > > Here's a patch against lsblk that adds a -D option to present this > > information in a human-readable form: > > Applied, thanks. > > > # lsblk -D > > NAME DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO > > sda 0 0B 0B 0 > > ââsda1 0 0B 0B 0 > > sdb 0 512B 2G 1 > > ââsdb1 0 512B 2G 1 > > I have a question, 2.6.35 on my ThinkPad, non-SSD disk: > > NAME DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO > sda 0 0B 0B 0 > ââsda1 4294935040 0B 0B 0 > ââsda2 4188038656 0B 0B 0 > ââsda3 1346205184 0B 0B 0 > ââsda4 3231165440 0B 0B 0 > ââsda5 4188006400 0B 0B 0 > â ââkzak-home (dm-0) 0 0B 0B 0 > ââsda6 2035725312 0B 0B 0 > > > Does is make sense? The DISC-ALN is non-zero but DISC-GRAN is zero. > > Note that cat /sys/block/sda/sda*/discard_alignment returns the same > numbers. > > Karel > > That is fixed by the kernel patch posted above :) -Lukas
