On Fri, Jan 30, 2015 at 1:55 PM, Vivek Goyal <vgoyal@xxxxxxxxxx> wrote: > On Thu, Aug 28, 2014 at 06:16:50PM -0400, Vasily Tarasov wrote: > > [..] >> +Example >> +======= >> + >> +Decide on metadata and data devices: >> + # META_DEV=/dev/sdX >> + # DATA_DEV=/dev/sdY >> + >> +Compute target size assuming 1.5 dedup ratio: >> + # DATA_DEV_SIZE=`blockdev --getsz $DATA_DEV` >> + # TARGET_SIZE=`expr $DATA_DEV_SIZE \* 10 / 15` > > Is above correct? With dm dedupe ratio of 1.5, target size > should be (15/10) * DATA_DEV_SIZE and not vice-a-versa? > You're right, that's a misprint, fixed it. >> + >> +Reset metadata device: >> + # dd if=/dev/zero of=$META_DEV bs=4096 count=1 >> + >> +Setup a target: >> + echo "0 $TARGET_SIZE dedup $META_DEV $DATA_DEV 4096 md5 cowbtree 100" |\ >> + dmsetup create mydedup >> + > > I setup a target and did "dmsetup table" and "dmsetup status" and they > both seem to be outputting same thing. I think output of "dmsetup table" > is wrong. As per the man page of dmsetup, you are supposed to output > the table in a format which can be directly feedback into tagrget for > loading. > > #dmsetup table > testdedup: 0 2930287752 dedup 244190646 244190646 0 0 4096 8:32 8:48 0 0 > 0 0 0 0 > > #dmsetup status > testdedup: 0 2930287752 dedup 244190646 244190646 0 0 4096 8:32 8:48 0 0 > 0 0 0 0 > Interesting, I actually didn't know that "dmsetup table" output should be in a format suitable for "dmsetup create/load". Will fix this! Thanks, Vasily -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
