From owner-freebsd-fs@FreeBSD.ORG  Fri Jan 18 14:57:43 2013
Return-Path: <owner-freebsd-fs@FreeBSD.ORG>
Delivered-To: freebsd-fs@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by hub.freebsd.org (Postfix) with ESMTP id 195AFA6B
 for <freebsd-fs@freebsd.org>; Fri, 18 Jan 2013 14:57:43 +0000 (UTC)
 (envelope-from ronald-freebsd8@klop.yi.org)
Received: from smarthost1.greenhost.nl (smarthost1.greenhost.nl
 [195.190.28.78]) by mx1.freebsd.org (Postfix) with ESMTP id C9FB2DF0
 for <freebsd-fs@freebsd.org>; Fri, 18 Jan 2013 14:57:42 +0000 (UTC)
Received: from smtp.greenhost.nl ([213.108.104.138])
 by smarthost1.greenhost.nl with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32)
 (Exim 4.69) (envelope-from <ronald-freebsd8@klop.yi.org>)
 id 1TwDNy-0004Lu-Tr
 for freebsd-fs@freebsd.org; Fri, 18 Jan 2013 15:57:40 +0100
Received: from [81.21.138.17] (helo=ronaldradial.versatec.local)
 by smtp.greenhost.nl with esmtpsa (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32)
 (Exim 4.72) (envelope-from <ronald-freebsd8@klop.yi.org>)
 id 1TwDNz-00017M-1v
 for freebsd-fs@freebsd.org; Fri, 18 Jan 2013 15:57:39 +0100
Content-Type: text/plain; charset=us-ascii; format=flowed; delsp=yes
To: freebsd-fs@freebsd.org
Subject: Re: Enable UNMAP in ZFS
References: <CAAOK-NAnzq=iUnygw=LmxT3rUHzSM7h+WO2WuOUkZVB7K1jDvw@mail.gmail.com>
 <CAFHbX1+8RnVZ0SF-6jMKc5gZMoyK6LB0VBzKeT5TuQEA0LREVA@mail.gmail.com>
Date: Fri, 18 Jan 2013 15:57:37 +0100
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
From: "Ronald Klop" <ronald-freebsd8@klop.yi.org>
Message-ID: <op.wq33ubwm8527sy@ronaldradial.versatec.local>
In-Reply-To: <CAFHbX1+8RnVZ0SF-6jMKc5gZMoyK6LB0VBzKeT5TuQEA0LREVA@mail.gmail.com>
User-Agent: Opera Mail/12.12 (Win32)
X-Virus-Scanned: by clamav at smarthost1.samage.net
X-Spam-Level: /
X-Spam-Score: -0.0
X-Spam-Status: No, score=-0.0 required=5.0 tests=BAYES_40 autolearn=disabled
 version=3.3.1
X-Scan-Signature: c74461a82029b6293650421ecb57b64a
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Filesystems <freebsd-fs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-fs>,
 <mailto:freebsd-fs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-fs>
List-Post: <mailto:freebsd-fs@freebsd.org>
List-Help: <mailto:freebsd-fs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
 <mailto:freebsd-fs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 18 Jan 2013 14:57:43 -0000

On Fri, 18 Jan 2013 15:23:03 +0100, Tom Evans <tevans.uk@googlemail.com>  
wrote:

> On Fri, Jan 18, 2013 at 1:07 PM, Dani <dppascual@gmail.com> wrote:
>> Hi all,
>>
>> I have installed FreeBSD 9.1 and have created a ZFS pool with SAS disks.
>> How can I enable UNMAP on SSDs devices used as cache and log devices?
>>
>> Thanks you. Regards.
>
> UNMAP, I don't know. FreeBSD ZFS has support for TRIM in 10-CURRENT.
>
> Oracle support UNMAP in Solaris 11.1, but judging from this, it's not
> that useful:
>
> http://docs.oracle.com/cd/E26502_01/html/E28978/gmibl.html
>
> Cheers
>
> Tom

Isn't UNMAP the SCSI name for TRIM?

Ronald.