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Date:      Fri, 08 May 2015 14:49:41 -0400
From:      Mike Tancsa <>
To:        Warren Block <>
Cc:        freebsd-questions <>
Subject:   Re: enabling TRIM on an existing UFS file system ?
Message-ID:  <>
In-Reply-To: <>
References:  <> <>

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On 5/8/2015 2:39 PM, Warren Block wrote:
>> But once I boot up, it seems to be disabled again ?
> Right.  Don't 'exit' there after changing a setting.  Instead, 'shutdown
> -r now' and check it again.  Once the setting has been changed, it will
> stick.  (Something about the filesystem details not being reread, but I
> forget the exact details.)

Ha, That did it!

0(mdt)# 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: space to hold for metadata blocks: (-k)            6408
tunefs: optimization preference: (-o)                      time
tunefs: volume label: (-L)

After I posted, I really did think to myself, "I bet wblock will know" ;-)


Mike Tancsa, tel +1 519 651 3400
Sentex Communications,
Providing Internet services since 1994
Cambridge, Ontario Canada

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