Date: Fri, 15 Apr 2016 08:57:43 +1000 From: Graham Menhennitt <graham@menhennitt.com.au> To: freebsd-current@freebsd.org Subject: Re: Heads up Message-ID: <57102067.6060708@menhennitt.com.au> In-Reply-To: <CANCZdfpnYnVrvhNagYUT9RhAuC1AMCrxh=GCt8RKT0bqxuJybw@mail.gmail.com>
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On 15/04/2016 8:42 AM, Warner Losh wrote: > The CAM I/O scheduler has been committed to current. This work is described > in https://people.freebsd.org/~imp/bsdcan2015/iosched-v3.pdf though the > default scheduler doesn't change the default (old) behavior. > > One possible issue, however, is that it also enables NCQ Trims on ada SSDs. > There are a few rogue drives that claim support for this feature, but > actually implement data corrupt instead of queued trims. The list of known > rogues is believed to be complete, but some caution is in order. > > What sort of caution, please? How do we check whether it's working? Is it an "all or nothing" type of thing, or could there be subtle problems? Thanks, Grahamhome | help
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