On 05/24/2011 11:19 PM, Tao Ma wrote: > would you mind providing a tar.gz for the btrfs-12-blk.log? Sure. I did have the log from the previous run, but I was careful in reproducing it and I get a slightly different result: # blkparse rand-read-btrfs-r1-blk.log | wc -l Bad magic 0 Bad magic 0 Bad magic 0 Bad magic 0 Out of memory, CPU info for device rand-read-btrfs-r1- (-46513984) Which brings up another question. I setup a btrfs with 12 32GB partitions: # btrfs filesystem show failed to read /dev/sr0 Label: none uuid: 16c43865-52d8-42ec-a0c3-420f0184f622 Total devices 12 FS bytes used 96.12GB devid 2 size 32.00GB used 32.00GB path /dev/sdd1 devid 3 size 32.00GB used 32.00GB path /dev/sde1 devid 5 size 32.00GB used 32.00GB path /dev/sdg1 devid 6 size 32.00GB used 32.00GB path /dev/sdh1 devid 11 size 32.00GB used 32.00GB path /dev/sdm1 devid 8 size 32.00GB used 32.00GB path /dev/sdj1 devid 10 size 32.00GB used 32.00GB path /dev/sdl1 devid 12 size 32.00GB used 32.00GB path /dev/sdn1 devid 1 size 32.00GB used 32.00GB path /dev/sdc1 devid 4 size 32.00GB used 32.00GB path /dev/sdf1 devid 9 size 32.00GB used 32.00GB path /dev/sdk1 devid 7 size 32.00GB used 32.00GB path /dev/sdi1 But there's no specific device for it, so I can mount any of the devices (/dev/sd[cdefghijklmn]1) and see the entire volume: $ df -h /tank Filesystem Size Used Avail Use% Mounted on /dev/sdc1 385G 193G 191G 51% /tank So obvious the btrfs mounted with /dev/sdc1 (385GB across 12 disks) is not the same as the device /dev/sdc1 (a 32GB partition on a single disk). So for proper btrfs usage I should monitor /dev/sdc1? Use 12 -d's to add each device? Use -I and list the 12 devices one per line in a file? Oh, the requests logs as well as details for making the filesystem, running the benchmark, and recording the blktrace is a 5.1MB file at http://broadley.org/bill/blktrace-btrfs.tar.gz -- To unsubscribe from this list: send the line "unsubscribe linux-btrace" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
