enabling TRIM on an existing UFS file system ?
Warren Block
wblock at wonkity.com
Fri May 8 18:39:52 UTC 2015
On Fri, 8 May 2015, Mike Tancsa wrote:
>
> I noticed TRIM was not enabled on an existing SSD drive, so I thought I would
> shut the box to single usermode and enable it.
>
> # tunefs -t enable /dev/ada0p2
> # 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)
> # exit
>
> 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.)
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