Hi all. I'm very happy with bcache. Now i'm try tune some params for own nedds.
Firstly i want to run 50 vps on disk and get to it greate performance
(im not warry about ssd disk failure).
What fs best of all for that? ext4 or btrfs?
What parameters in bcache i need to tune to get maximum performance?
I'm try to disable sequential cutoff
Now i'm get something like this, Why i have very bad random read speed?
Auto Mode
OPS Mode. Output is in operations per second.
File size set to 3145728 KB
Command line used: iozone -a -i0 -i1 -i2 -O -s3G
Time Resolution = 0.000001 seconds.
Processor cache size set to 1024 Kbytes.
Processor cache line size set to 32 bytes.
File stride size set to 17 * record size.
random
random bkwd record stride
KB reclen write rewrite read reread read
write read rewrite read fwrite frewrite fread freread
3145728 4 112681 101056 97197 94559 3641 40138
3145728 8 68963 67357 35151 39137 2789 49231
3145728 16 28620 34762 20139 22825 2303 28583
3145728 32 13285 16637 10209 11520 1848 13074
3145728 64 6875 8470 5229 5817 1268 7887
3145728 128 3946 4078 2660 2943 905 4004
3145728 256 1983 2183 1350 1452 593 1801
3145728 512 988 971 672 727 418 1079
3145728 1024 474 527 345 375 280 552
3145728 2048 265 255 170 183 158 235
3145728 4096 135 129 89 91 85 121
3145728 8192 67 63 45 45 43 63
3145728 16384 34 32 22 22 22 33
i mount ext4 via
/dev/bcache0 /var/lib/libvirt/images ext4
rw,relatime,journal_checksum,journal_async_commit,errors=remount-ro,min_batch_time=15000,max_batch_time=60000,data=ordered
0 0
--
Vasiliy Tolstov,
e-mail: [email protected]
jabber: [email protected]
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