On 16/05/16 14:02, Tim Small wrote: > # iostat -y -d 2 -x -p /dev/sdf /dev/dm-0 /dev/md2 /dev/bcache0 ... and then mangled the word-wrapping. Try again: Here's a typical hand-edited excerpt from: iostat -d 2 -x -y -m -p /dev/sdf /dev/dm-0 /dev/md2 /dev/bcache0 ... Device: r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await sdf 396.50 19.50 272.02 0.25 1340.38 138.44 346.09 sdf3 397.00 0.00 272.52 0.00 1405.83 130.05 338.40 dm-0 0.00 149.00 0.00 271.29 3728.81 0.01 0.04 md2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 bcache0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 where: sdf is the SSD (bcache cache device is sdf3) dm-0 is dm-crypt backing device (bcache backing store) md2 is the underlying device for dm-crypt bcache0 is the bcache device. According to the iostat manual page: "avgrq-sz The average size (in sectors) of the requests that were issued to the device." dm-0 is described like this in the output of 'dmsetup table': encryptedstore01: 0 46879675392 crypt aes-xts-plain64 0000000000000000000000000000000000000000000000000000000000000000 0 9:2 3072 1 allow_discards Tim. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
