From owner-freebsd-fs@freebsd.org Tue Sep 22 07:42:43 2015 Return-Path: Delivered-To: freebsd-fs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 28CDEA06CBC for ; Tue, 22 Sep 2015 07:42:43 +0000 (UTC) (envelope-from jg@internetx.com) Received: from mx1.internetx.com (mx1.internetx.com [62.116.129.39]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id DD1BF1171 for ; Tue, 22 Sep 2015 07:42:42 +0000 (UTC) (envelope-from jg@internetx.com) Received: from localhost (localhost [127.0.0.1]) by mx1.internetx.com (Postfix) with ESMTP id A07441472009 for ; Tue, 22 Sep 2015 09:42:40 +0200 (CEST) X-Virus-Scanned: InterNetX GmbH amavisd-new at ix-mailer.internetx.de Received: from mx1.internetx.com ([62.116.129.39]) by localhost (ix-mailer.internetx.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3OZ3oHoc1Y+5 for ; Tue, 22 Sep 2015 09:42:38 +0200 (CEST) Received: from [192.168.100.26] (pizza.internetx.de [62.116.129.3]) (using TLSv1 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by mx1.internetx.com (Postfix) with ESMTPSA id 5D3281472004 for ; Tue, 22 Sep 2015 09:42:38 +0200 (CEST) Reply-To: jg@internetx.com, jg@internetx.com Subject: Re: [HAST] ZFS, many disks, write order References: <560102BD.6040703@internetx.com> To: freebsd-fs@freebsd.org From: InterNetX - Juergen Gotteswinter Message-ID: <56010663.3050201@internetx.com> Date: Tue, 22 Sep 2015 09:42:27 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 MIME-Version: 1.0 In-Reply-To: <560102BD.6040703@internetx.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Sep 2015 07:42:43 -0000 my fault, forget my comment about single zil Am 22.09.2015 um 09:26 schrieb InterNetX - Juergen Gotteswinter: > One of the great Hast Features is that it Hides Disk Failures from ZFS, > this has been already discussed on this List a few Months ago. > > Single ZIL Flash Drive is also not such a great Idea. I whould suggest > to start from scratch with "ZFS Best Practices". > > Am 21.09.2015 um 23:10 schrieb Ben RUBSON: >> Hello, >> >> I plan to use HAST to synchronize a ZFS pool between 2 servers. >> The ZFS pool has 3 RAID-Z2 VDEVs (8+2), + 3 spares. >> +1 mirror for SLOG. >> +1 mirror for L2ARC. >> So a total of 37 disks (4TB each). >> 40Gb/s network bandwidth between the 2 servers. >> >> Will I have to define each of the 37 disks/resources in hast.conf ? >> Stupid question, but will this setup (with so many resources) work ? >> >> Will write IOs be ordered on the secondary node in the same order (over all the 37 devices) as they occurred on the primary node ? >> This of course to have the secondary node consistent, even after a power failure of the primary during a high IO load, leading into an import -F on the secondary node. >> >> In HAST, each resource seems to be "independent" from the others. >> In DRBD, as an example, we can put several volumes in a same resource to guarantee write order over all the volumes (disks) of the resource. >> Example : >> >> resource r0 { >> volume 0 { >> device /dev/drbd0; >> disk /dev/c0v0; >> } >> volume 1 { >> device /dev/drbd1; >> disk /dev/c0v1; >> } >> } >> >> What about HAST then ? >> Of course I would have liked to have my 37 disks as volumes in the same resource, as in the example above. >> >> Thank you very much for your help ! >> >> Best regards, >> >> Ben >> >> _______________________________________________ >> freebsd-fs@freebsd.org mailing list >> https://lists.freebsd.org/mailman/listinfo/freebsd-fs >> To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" >> > _______________________________________________ > freebsd-fs@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" >