SSD optimizations: Difference between revisions
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See http://tombuntu.com/index.php/2008/09/04/four-tweaks-for-using-linux-with-solid-state-drives/ | See http://tombuntu.com/index.php/2008/09/04/four-tweaks-for-using-linux-with-solid-state-drives/ | ||
put /tmp in RAM: | |||
tmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0root@raven:/etc# | |||
/boot, /home, /swap on Velociraptor /dev/sdd | /boot, /home, /swap on Velociraptor /dev/sdd | ||
/ on RevoDrive /dev/md0 (/dev/sda, /dev/ | / on RevoDrive /dev/md0 (/dev/sda, /dev/sdb) | ||
I don't know that this is optimal but it's what I used | I don't know that this is optimal but it's what I used | ||
| Line 14: | Line 18: | ||
disable the elevator scheduler, put these in /etc/rc.local | disable the elevator scheduler, put these in /etc/rc.local | ||
echo noop > /sys/block/ | echo noop > /sys/block/sda/queue/scheduler | ||
echo noop > /sys/block/ | echo noop > /sys/block/sdb/queue/scheduler | ||
manage write caching via /etc/hdparm.conf | manage write caching via /etc/hdparm.conf | ||
# | # SSD RevoDrive | ||
/dev/sda { | /dev/sda { | ||
write_cache = | write_cache = off | ||
} | } | ||
/dev/sdb { | /dev/sdb { | ||
write_cache = | write_cache = off | ||
} | } | ||
# | # Raptor drive | ||
/dev/sdc { | /dev/sdc { | ||
write_cache = | write_cache = on | ||
} | } | ||
# Caviar drive | |||
/dev/sdd { | /dev/sdd { | ||
write_cache = | write_cache = on | ||
} | } | ||
==Test results== | ==Test results== | ||
Revision as of 05:07, 17 November 2011
See http://tombuntu.com/index.php/2008/09/04/four-tweaks-for-using-linux-with-solid-state-drives/
put /tmp in RAM:
tmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0root@raven:/etc#
/boot, /home, /swap on Velociraptor /dev/sdd
/ on RevoDrive /dev/md0 (/dev/sda, /dev/sdb)
I don't know that this is optimal but it's what I used
mdadm --create --verbose /dev/md0 --level=0 --raid-devices=2 /dev/sda /dev/sdb mke2fs -b 409 -E stride 16 /dev/md0
put noatime option in /etc/fstab
disable the elevator scheduler, put these in /etc/rc.local
echo noop > /sys/block/sda/queue/scheduler echo noop > /sys/block/sdb/queue/scheduler
manage write caching via /etc/hdparm.conf
# SSD RevoDrive
/dev/sda {
write_cache = off
}
/dev/sdb {
write_cache = off
}
# Raptor drive
/dev/sdc {
write_cache = on
}
# Caviar drive
/dev/sdd {
write_cache = on
}
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
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 1412 97 90887 7 44795 5 3581 97 111852 5 299.7 6
Latency 8841us 688ms 1184ms 17654us 349ms 142ms
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
16 334 1 +++++ +++ 472 1 332 1 +++++ +++ 473 1
Latency 109ms 130us 124ms 354ms 35us 242ms
1.96,1.96,raven,1,1289708289,16G,,1412,97,90887,7,44795,5,3581,97,111852,5,299.7,6,16,,,,,334,1,+++++,+++,472,1,332,1,+++++,+++,473,1,8841us,688ms,1184ms,17654us,349ms,142ms,109ms,130us,124ms,354ms,35us,242ms
# 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
