From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lutz Vieweg Subject: Re: What happened to TRIM support for raid linear/0/1/10? Date: Wed, 08 Aug 2012 19:58:56 +0200 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 08/08/2012 03:10 PM, Holger Kiehl wrote: > Personally, I would think that TRIM support MD would be a very good thing. That's one thing I am waiting for, too. We had to implement a somewhat clumsy user-space application which does the trick for us - but that is an ugly work-around, as it has to allocate most of the free space on a filesystem for at least a little while (to know what blocks it can discard). Without periodic discard runs, our SSD-equipped servers suffer a ~50% write performance penalty, so this feature is not just a cosmetic issue to us. Regards, Lutz Vieweg