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  #1  
Old November 29th, 2011, 09:35
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Default TRIM support on UFS2 FreeBSD 9
Do we have TRIM support on UFS2 FreeBSD 9?
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Last edited by DutchDaemon; November 30th, 2011 at 01:28.
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  #2  
Old November 29th, 2011, 10:18
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8.1 Release notes:
Quote:
The ada(4) driver now supports BIO_DELETE. For SSDs this uses TRIM feature of DATA SET MANAGEMENT command, as defined by ACS-2 specification working draft. For Compact Flash use CFA ERASE command, same as ad(4) does. This change realizes restoring write speed of SSDs which supports TRIM command by doing newfs -E /dev/ada1, for example.
http://www.freebsd.org/cgi/cvsweb.cg...c#rev1.153.2.4
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Old November 29th, 2011, 13:26
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I am not so familiar with this kind of thing and i have some questions
  1. How to check my ada0 already have TRIM feature on?
  2. Do i need to run this newfs command daily?
  3. How to turn on TRIM for existing filesystem?
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Last edited by phoenix; November 30th, 2011 at 23:10. Reason: no space before punctuation; use list tag
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Old November 29th, 2011, 13:32
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Quote:
Originally Posted by alie View Post
2. Do i need to run this newfs command daily ?
If you value your data, no.

From newfs(8):
Quote:
The newfs utility is used to initialize and clear file systems before first use.
And,
Quote:
-E Erase the content of the disk before making the filesystem. The reserved area in front of the superblock (for bootcode) will not be erased.
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Old November 29th, 2011, 14:01
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Code:
[/usr/home/ezyclie]# tunefs -p /dev/ada0p2
tunefs: POSIX.1e ACLs: (-a)                                disabled
tunefs: NFSv4 ACLs: (-N)                                   disabled
tunefs: MAC multilabel: (-l)                               disabled
tunefs: soft updates: (-n)                                 enabled
tunefs: soft update journaling: (-j)                       enabled
tunefs: gjournal: (-J)                                     disabled
tunefs: trim: (-t)                                         disabled
tunefs: maximum blocks per file in a cylinder group: (-e)  4096
tunefs: average file size: (-f)                            16384
tunefs: average number of files in a directory: (-s)       64
tunefs: minimum percentage of free space: (-m)             8%
tunefs: optimization preference: (-o)                      time
tunefs: volume label: (-L)
So it's not possible to enable trim support with:
Code:
# tunefs -t enable /dev/ada0p2
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Last edited by alie; November 29th, 2011 at 14:09.
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Old November 29th, 2011, 14:24
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Okie solved:

Code:
1. Single user mode
2. # mount
3. # tunefs -t enable /dev/ada0p2
Code:
[/usr/home/ezyclie]# tunefs -p /dev/ada0p2
tunefs: POSIX.1e ACLs: (-a)                                disabled
tunefs: NFSv4 ACLs: (-N)                                   disabled
tunefs: MAC multilabel: (-l)                               disabled
tunefs: soft updates: (-n)                                 enabled
tunefs: soft update journaling: (-j)                       enabled
tunefs: gjournal: (-J)                                     disabled
tunefs: trim: (-t)                                         enabled
tunefs: maximum blocks per file in a cylinder group: (-e)  4096
tunefs: average file size: (-f)                            16384
tunefs: average number of files in a directory: (-s)       64
tunefs: minimum percentage of free space: (-m)             8%
tunefs: optimization preference: (-o)                      time
tunefs: volume label: (-L)
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  #7  
Old November 30th, 2011, 23:12
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When in doubt, read the man page: tunefs(8)

It mentions in there you can't manipulate mounted filesystem unless they are mounted read-only. And several options can't be enabled until you run an fsck.
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Last edited by DutchDaemon; December 1st, 2011 at 02:54.
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Old December 1st, 2011, 13:07
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Bummer, it would be nice to able to change these and have them take effect on reboot.
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