From owner-freebsd-fs@FreeBSD.ORG Wed Oct 17 11:29:59 2012 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id E790D4BB for ; Wed, 17 Oct 2012 11:29:59 +0000 (UTC) (envelope-from prvs=1636d8f419=killing@multiplay.co.uk) Received: from mail1.multiplay.co.uk (mail1.multiplay.co.uk [85.236.96.23]) by mx1.freebsd.org (Postfix) with ESMTP id 6C0668FC0C for ; Wed, 17 Oct 2012 11:29:58 +0000 (UTC) Received: from r2d2 ([188.220.16.49]) by mail1.multiplay.co.uk (mail1.multiplay.co.uk [85.236.96.23]) (MDaemon PRO v10.0.4) with ESMTP id md50000716770.msg for ; Tue, 16 Oct 2012 16:46:11 +0100 X-Spam-Processed: mail1.multiplay.co.uk, Tue, 16 Oct 2012 16:46:11 +0100 (not processed: message from valid local sender) X-MDRemoteIP: 188.220.16.49 X-Return-Path: prvs=1636d8f419=killing@multiplay.co.uk X-Envelope-From: killing@multiplay.co.uk X-MDaemon-Deliver-To: freebsd-fs@freebsd.org Message-ID: <089898A4493042448C934643FD5C3887@multiplay.co.uk> From: "Steven Hartland" To: "Dustin Wenz" , "Olivier Smedts" , "Mark Felder" References: <6116A56E-4565-4485-887E-46E3ED231606@ebureau.com> Subject: Re: Imposing ZFS latency limits Date: Tue, 16 Oct 2012 16:46:00 +0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 Cc: freebsd-fs@freebsd.org X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Oct 2012 11:30:00 -0000 ----- Original Message ----- From: "Mark Felder" > On Tue, 16 Oct 2012 06:25:57 -0500, Olivier Smedts > wrote: > >> >> That would be great - no need for TLER drives. But if you want to >> "drop" the drive from the bus, that would be a GEOM thing. Don't know >> if that's possible to implement. > > This would be GREATLY appreciated. I've seen this happen on my own ZFS > boxes as well as on a custom made SAN. It's painful but easy to detect > when you notice the symptoms... Interesting, what metrics where you using which made it easy to detect, work be nice to know your process there Mark? Regards Steve ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337 or return the E.mail to postmaster@multiplay.co.uk.