SSD optimizations: Difference between revisions

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Partition alignment: use gdisk
http://siduction.org/index.php?module=news&func=display&sid=78&lang=en
== CentOS ==
Installing CentOS 6.x on a new server...
https://sites.google.com/site/lightrush/random-1/howtoconfigureext4toenabletrimforssdsonubuntu
* Add 'discard' option to mounts
* Move /var from the SSD to a HD
http://wiki.debian.org/SSDoptimization
== Linux ==
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:  
put /tmp in RAM:  


tmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0
tmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0


/boot, /home, /swap on Velociraptor /dev/sdd
/boot, /home, /swap on Velociraptor /dev/sdd
Line 15: Line 33:


put noatime option in /etc/fstab
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
manage write caching via /etc/hdparm.conf
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  }
  }
   
   
===Test results===


==Test results==
====On Raven====


the new Black drive is faster than the Velociraptor.
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.


Line 84: Line 98:
  # 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
====On Bellman====
OCZ drive:
/dev/sda:
  Timing buffered disk reads: 762 MB in  3.01 seconds = 253.45 MB/sec
WD Caviar Green drive:
/dev/sdb:
  Timing buffered disk reads: 334 MB in  3.01 seconds = 111.11 MB/sec
WDC Black NVME (512 GB) 2019-04-26
hdparm -Tt --direct /dev/nvme0n1p1
/dev/nvme0n1p1:
  Timing O_DIRECT cached reads:  1736 MB in  2.00 seconds = 868.14 MB/sec
  Timing O_DIRECT disk reads: 2698 MB in  3.00 seconds = 898.94 MB/sec
Samsung 850 (or something like that) 2019-04-26
hdparm -Tt --direct /dev/sda1
/dev/sda1:
  Timing O_DIRECT cached reads:  298 MB in  2.00 seconds = 148.69 MB/sec
  Timing O_DIRECT disk reads: 258 MB in  3.00 seconds =  85.91 MB/sec
== Windows ==
http://www.overclock.net/t/1156654/seans-windows-7-install-guide-optimization-for-ssds-hdds
These are suggestions for a developer machine, YMMV
Run services.msc as admin and turn off superfetch
Remove the hibernation file: powercfg -h off
Turn off indexing (it's a drive property)
Reduce size of page file
== Laysan tests ==
2017-08-05
NVME WDC
bonnie++ -d /volumes/ssd_machines/test -n 1
SSD Samsung 840
bonnie++ -d /volumes/evo/test -n 1
WDC Caviar Black
bonnie++ -d /home/bwilson/test -n 1
hdparm -tT --direct /dev/nvme0n1
/dev/nvme0n1:
Timing O_DIRECT cached reads:  1096 MB in  2.00 seconds = 547.22 MB/sec
Timing O_DIRECT disk reads: 3384 MB in  3.00 seconds = 1127.63 MB/sec
hdparm -tT --direct /dev/sdb
/dev/sdb:
Timing O_DIRECT cached reads:  784 MB in  2.00 seconds = 391.66 MB/sec
Timing O_DIRECT disk reads: 136 MB in  3.12 seconds =  43.61 MB/sec

Latest revision as of 06:04, 26 April 2019

Partition alignment: use gdisk

http://siduction.org/index.php?module=news&func=display&sid=78&lang=en


CentOS

Installing CentOS 6.x on a new server...

https://sites.google.com/site/lightrush/random-1/howtoconfigureext4toenabletrimforssdsonubuntu

  • Add 'discard' option to mounts
  • Move /var from the SSD to a HD

http://wiki.debian.org/SSDoptimization

Linux

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 0

/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

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

On Raven

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

On Bellman

OCZ drive:

/dev/sda:
  Timing buffered disk reads: 762 MB in  3.01 seconds = 253.45 MB/sec

WD Caviar Green drive:

/dev/sdb:
  Timing buffered disk reads: 334 MB in  3.01 seconds = 111.11 MB/sec

WDC Black NVME (512 GB) 2019-04-26

hdparm -Tt --direct /dev/nvme0n1p1
/dev/nvme0n1p1:
  Timing O_DIRECT cached reads:   1736 MB in  2.00 seconds = 868.14 MB/sec
  Timing O_DIRECT disk reads: 2698 MB in  3.00 seconds = 898.94 MB/sec

Samsung 850 (or something like that) 2019-04-26

hdparm -Tt --direct /dev/sda1
/dev/sda1:
  Timing O_DIRECT cached reads:   298 MB in  2.00 seconds = 148.69 MB/sec
  Timing O_DIRECT disk reads: 258 MB in  3.00 seconds =  85.91 MB/sec

Windows

http://www.overclock.net/t/1156654/seans-windows-7-install-guide-optimization-for-ssds-hdds

These are suggestions for a developer machine, YMMV

Run services.msc as admin and turn off superfetch

Remove the hibernation file: powercfg -h off

Turn off indexing (it's a drive property)

Reduce size of page file

Laysan tests

2017-08-05

NVME WDC

bonnie++ -d /volumes/ssd_machines/test -n 1

SSD Samsung 840

bonnie++ -d /volumes/evo/test -n 1

WDC Caviar Black

bonnie++ -d /home/bwilson/test -n 1


hdparm -tT --direct /dev/nvme0n1

/dev/nvme0n1:

Timing O_DIRECT cached reads:   1096 MB in  2.00 seconds = 547.22 MB/sec
Timing O_DIRECT disk reads: 3384 MB in  3.00 seconds = 1127.63 MB/sec

hdparm -tT --direct /dev/sdb


/dev/sdb:

Timing O_DIRECT cached reads:   784 MB in  2.00 seconds = 391.66 MB/sec
Timing O_DIRECT disk reads: 136 MB in  3.12 seconds =  43.61 MB/sec