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.
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