SSD optimizations: Difference between revisions
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Test results | ==Test results== | ||
the new Black drive is faster than the Velociraptor. | |||
The SSD is FAST and the Green is slow. No surprises there. Tested with hdparm -t command. | The SSD is FAST and the Green is slow. No surprises there. Tested with hdparm -t command. | ||
# RevoDrive | # RevoDrive | ||
Timing buffered disk reads: 1028 MB in 3.01 seconds = 341.87 MB/sec | Timing buffered disk reads: 1028 MB in 3.01 seconds = 341.87 MB/sec | ||
bonnie++ | |||
Version 1.96 ------Sequential Output------ --Sequential Input- --Random- | |||
Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- | |||
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP | |||
raven 16G 1958 99 498533 42 193488 24 4443 98 501475 27 6290 125 | |||
Latency 6425us 378ms 52859us 2402us 9032us 4884us | |||
Version 1.96 ------Sequential Create------ --------Random Create-------- | |||
raven -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- | |||
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP | |||
16 7355 95 +++++ +++ +++++ +++ 7916 94 +++++ +++ 24012 89 | |||
Latency 490us 113us 74us 265us 32us 763us | |||
1.96,1.96,raven,1,1289707876,16G,,1958,99,498533,42,193488,24,4443,98,501475,27,6290,125,16,,,,,7355,95,+++++,+++,+++++,+++,7916,94,+++++,+++,24012,89,6425us,378ms,52859us,2402us,9032us,4884us,490us,113us,74us,265us,32us,763us | |||
# Velociraptor | # Velociraptor | ||
Timing buffered disk reads: 358 MB in 3.01 seconds = 118.84 MB/sec | Timing buffered disk reads: 358 MB in 3.01 seconds = 118.84 MB/sec | ||
bonnie++ -d /home/bwilson/foo | |||
# Caviar Green | # Caviar Green | ||
Timing buffered disk reads: 198 MB in 3.00 seconds = 65.97 MB/sec | Timing buffered disk reads: 198 MB in 3.00 seconds = 65.97 MB/sec | ||
# Caviar Black | # Caviar Black | ||
Timing buffered disk reads: 442 MB in 3.01 seconds = 146.99 MB/sec | Timing buffered disk reads: 442 MB in 3.01 seconds = 146.99 MB/sec | ||
Revision as of 05:05, 14 November 2010
See http://tombuntu.com/index.php/2008/09/04/four-tweaks-for-using-linux-with-solid-state-drives/
/boot, /home, /swap on raptor /dev/sda / on RevoDrive /dev/md0 (/dev/sdc, /dev/sdd)
1 put noatime option in /etc/fstab
2 disable the elevator scheduler, put these in /etc/rc.local
echo noop > /sys/block/sdc/queue/scheduler echo noop > /sys/block/sdd/queue/scheduler
3 manage write caching via /etc/hdparm.conf
# Raptor drive
/dev/sda {
write_cache = on
}
# Caviar drive
/dev/sdb {
write_cache = on
}
# SSD RevoDrive
/dev/sdc {
write_cache = off
}
/dev/sdd {
write_cache = off
}
Test results
the new Black drive is faster than the Velociraptor. The SSD is FAST and the Green is slow. No surprises there. Tested with hdparm -t command.
# RevoDrive Timing buffered disk reads: 1028 MB in 3.01 seconds = 341.87 MB/sec
bonnie++
Version 1.96 ------Sequential Output------ --Sequential Input- --Random-
Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
raven 16G 1958 99 498533 42 193488 24 4443 98 501475 27 6290 125
Latency 6425us 378ms 52859us 2402us 9032us 4884us
Version 1.96 ------Sequential Create------ --------Random Create--------
raven -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 7355 95 +++++ +++ +++++ +++ 7916 94 +++++ +++ 24012 89
Latency 490us 113us 74us 265us 32us 763us
1.96,1.96,raven,1,1289707876,16G,,1958,99,498533,42,193488,24,4443,98,501475,27,6290,125,16,,,,,7355,95,+++++,+++,+++++,+++,7916,94,+++++,+++,24012,89,6425us,378ms,52859us,2402us,9032us,4884us,490us,113us,74us,265us,32us,763us
# Velociraptor Timing buffered disk reads: 358 MB in 3.01 seconds = 118.84 MB/sec bonnie++ -d /home/bwilson/foo
# Caviar Green Timing buffered disk reads: 198 MB in 3.00 seconds = 65.97 MB/sec
# Caviar Black Timing buffered disk reads: 442 MB in 3.01 seconds = 146.99 MB/sec
