Date: Thu, 28 Jul 2011 10:26:19 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Alexander Motin" <mav@FreeBSD.org> Cc: freebsd-fs@freebsd.org Subject: Re: Questions about erasing an ssd to restore performance under FreeBSD Message-ID: <1E487B0F985745459272F052426964C7@multiplay.co.uk> References: <mailpost.1311806406.6677649.16811.mailing.freebsd.fs@FreeBSD.cs.nctu.edu.tw> <4E312747.3020009@FreeBSD.org>
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----- Original Message -----
From: "Alexander Motin" <mav@FreeBSD.org>
> `newfs -E` depends on disk driver's support for BIO_DELETE request. For
> now, AFAIR it is supported at least by ada, mmcsd, some cases of ad and
> few other cases. da driver doesn't support it now. Also, except da
> driver, TRIM command should be supported by the controller firmware,
> that implements SCSI<->ATA protocol translation, and AFAIK often it
> isn't so.
That's what I thought might be the case, would be good to mention this in
the man page as atm its very misleading.
Regards
Steve
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