Date: Thu, 4 Jul 2013 13:33:42 -0700 From: Jeremy Chadwick <jdc@koitsu.org> To: Mike Jakubik <mike.jakubik@intertainservices.com> Cc: freebsd-stable@freebsd.org Subject: Re: UFS Trim wont stay set Message-ID: <20130704203342.GA98181@icarus.home.lan> In-Reply-To: <51D5CEF8.9000504@intertainservices.com> References: <51D5CEF8.9000504@intertainservices.com>
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On Thu, Jul 04, 2013 at 03:37:28PM -0400, Mike Jakubik wrote: > Hello, > > I've just installed a stable snapshot on a new machine with a SSD > drive, after installing i booted single user mode and ran > > # tunefs -t enable /dev/ada0p2 > tunefs: issue TRIM to the disk set > > Great, back to multiuser mode, i check the partition > > # 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 > > What the heck.. did i miss something? Back to single user mode and > > # tunefs -t enable /dev/ada0p2 > tunefs: issue TRIM to the disk remains unchanged as enabled > > I check again in multiuser mode and it says disabled, any ideas what > is going on here? Yup, experienced this myself many times over. The reasons are understood (it's not limited to just the TRIM bits, it's related to anything adjusting the superblock -- it gets cached in memory in certain situations and not flushed back to disk). Hint: are you booting into single user and then issuing a "mount" command before doing your tunefs stuff? If so, this is probably what's causing it (at least it was in my case). Instead just boot into single-user, do not mount anything, and use /sbin/tunefs (if available -- depends on your filesystem setup) or /rescue/tunefs. -- | Jeremy Chadwick jdc@koitsu.org | | UNIX Systems Administrator http://jdc.koitsu.org/ | | Making life hard for others since 1977. PGP 4BD6C0CB |
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