Hi all, This is my first email to this list, so please excuse any gaffe.
I am in the evaluation early stages of a new storage, an SGI MIS, currently with two HBAs LSI and 32 disks. The hba controllers are LSI 9207-8i and the disks are Seagate 6TB, model ST6000NM0004-1FT17Z. To evaluate the performance I am using IOzone over a raid0 using all the 32 disks, with the parameters: iozone -i0 -i1 -t5 -s 20G -P0. With btrfs the result approaches 3.5GB/s. When using mdadm+xfs the result reaches 6gb/s, which is the expected value when compared with parallel dd made on discs. When used btrfs with only half of the disc the result is about 3GB/s. More information: # uname -a Linux spstrg13 4.2.0-999-generic #201508132200 SMP Fri Aug 14 02:01:52 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux # btrfs --version btrfs-progs v4.0 # btrfs fi show Label: none uuid: be2a5671-87d1-4b89-ac4a-04efabb5912f Total devices 32 FS bytes used 3.66MiB devid 1 size 5.46TiB used 1.07GiB path /dev/sdc devid 2 size 5.46TiB used 1.06GiB path /dev/sdd devid 3 size 5.46TiB used 1.06GiB path /dev/sde devid 4 size 5.46TiB used 1.06GiB path /dev/sdf devid 5 size 5.46TiB used 1.06GiB path /dev/sdg devid 6 size 5.46TiB used 1.06GiB path /dev/sdh devid 7 size 5.46TiB used 1.06GiB path /dev/sdi devid 8 size 5.46TiB used 1.06GiB path /dev/sdj devid 9 size 5.46TiB used 1.06GiB path /dev/sdk devid 10 size 5.46TiB used 1.06GiB path /dev/sdl devid 11 size 5.46TiB used 1.06GiB path /dev/sdm devid 12 size 5.46TiB used 1.06GiB path /dev/sdn devid 13 size 5.46TiB used 1.06GiB path /dev/sdo devid 14 size 5.46TiB used 1.06GiB path /dev/sdp devid 15 size 5.46TiB used 1.06GiB path /dev/sdq devid 16 size 5.46TiB used 1.06GiB path /dev/sdr devid 17 size 5.46TiB used 1.06GiB path /dev/sds devid 18 size 5.46TiB used 1.06GiB path /dev/sdt devid 19 size 5.46TiB used 1.06GiB path /dev/sdu devid 20 size 5.46TiB used 1.06GiB path /dev/sdv devid 21 size 5.46TiB used 1.06GiB path /dev/sdw devid 22 size 5.46TiB used 1.06GiB path /dev/sdx devid 23 size 5.46TiB used 1.06GiB path /dev/sdy devid 24 size 5.46TiB used 1.06GiB path /dev/sdz devid 25 size 5.46TiB used 1.06GiB path /dev/sdaa devid 26 size 5.46TiB used 1.06GiB path /dev/sdab devid 27 size 5.46TiB used 1.06GiB path /dev/sdac devid 28 size 5.46TiB used 1.06GiB path /dev/sdad devid 29 size 5.46TiB used 1.06GiB path /dev/sdae devid 30 size 5.46TiB used 1.06GiB path /dev/sdaf devid 31 size 5.46TiB used 1.06GiB path /dev/sdag devid 32 size 5.46TiB used 1.06GiB path /dev/sdah btrfs-progs v4.0 # btrfs fi df /root/backup/root/storageTestes/mbtr Data, RAID0: total=30.00GiB, used=3.50MiB System, RAID0: total=32.00MiB, used=16.00KiB Metadata, RAID0: total=4.00GiB, used=128.00KiB Metadata, single: total=8.00MiB, used=16.00KiB GlobalReserve, single: total=16.00MiB, used=0.00B The dmesg is attached. The result are about the same using kernel 3.16 and btrfs tools 3.12. I am far from be able to isolate the problem, so please ask me any information you think is relevant. Thanks in advance. Eduardo. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html