From owner-freebsd-questions@freebsd.org Wed Jan 2 19:42:39 2019 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 778E6142E1D1 for ; Wed, 2 Jan 2019 19:42:39 +0000 (UTC) (envelope-from paul@ifdnrg.com) Received: from outbound.ifdnrg.com (outbound2.ifdnrg.com [193.200.98.38]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "outbound.ifdnrg.com", Issuer "COMODO RSA Domain Validation Secure Server CA" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id C6B6E6D34C for ; Wed, 2 Jan 2019 19:42:38 +0000 (UTC) (envelope-from paul@ifdnrg.com) Received: from [192.168.0.10] (38.156-30-62.static.virginmediabusiness.co.uk [62.30.156.38]) (authenticated bits=0) by outbound.ifdnrg.com (8.15.2/8.15.2) with ESMTPSA id x02JcApN065623 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO) for ; Wed, 2 Jan 2019 19:38:11 GMT (envelope-from paul@ifdnrg.com) X-Authentication-Warning: outbound.ifdnrg.com: Host 38.156-30-62.static.virginmediabusiness.co.uk [62.30.156.38] claimed to be [192.168.0.10] Subject: Re: parallel zfs sends To: freebsd-questions@freebsd.org References: <6924d723-773b-ecf7-e392-8a2126937a69@ifdnrg.com> <20190102173553.GA9819@neutralgood.org> From: Paul Macdonald Message-ID: <4ca737e1-b3d3-2164-ba8b-645c57b7eb19@ifdnrg.com> Date: Wed, 2 Jan 2019 19:42:35 +0000 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.3.3 MIME-Version: 1.0 In-Reply-To: Content-Language: en-GB X-Rspamd-Queue-Id: C6B6E6D34C X-Spamd-Bar: ---- X-Spamd-Result: default: False [-4.15 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:193.200.98.0/23]; HAS_XAW(0.00)[]; TO_DN_NONE(0.00)[]; DKIM_TRACE(0.00)[ifdnrg.com:+]; DMARC_POLICY_ALLOW(-0.50)[ifdnrg.com,quarantine]; MX_GOOD(-0.01)[cached: as1.ifdnrg.com]; RCVD_IN_DNSWL_LOW(-0.10)[38.98.200.193.list.dnswl.org : 127.0.5.1]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+,1:+]; ASN(0.00)[asn:20860, ipnet:193.200.98.0/23, country:GB]; IP_SCORE(-0.17)[asn: 20860(-0.76), country: GB(-0.10)]; MID_RHS_MATCH_FROM(0.00)[]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[ifdnrg.com:s=ifdnrg-default]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-0.999,0]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org]; RCPT_COUNT_ONE(0.00)[1]; DWL_DNSWL_LOW(-1.00)[ifdnrg.com.dwl.dnswl.org : 127.0.5.1]; NEURAL_SPAM_SHORT(0.13)[0.134,0]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[] Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Jan 2019 19:42:39 -0000 On 02/01/2019 19:36, Paul Macdonald via freebsd-questions wrote: > > On 02/01/2019 17:35, Kevin P. Neal wrote: >> On Wed, Jan 02, 2019 at 01:47:37PM +0000, Paul Macdonald via >> freebsd-questions wrote: >>> Is there any obvious problem with running parallel zfs sends onto a >>> target pool, >> Oh, I don't know, but it sounds risky. Especially if you have overlap >> in the datasets that are being updated. I really wouldn't try to update >> the same datasets from multiple zfs send commands in parallel. If >> they're >> not overlapping datasets then, um, hmmmm. I don't know. > > > these aren't targetting the same zfs filesystems, i see the error when > running parallel jobs to seperate zfs file systems, on the same pool ( > which i'd have thought was fine) > >> also, as an aside,  i always find that when doing zfs syncs i have to do force the first incremental with -F as a matter of course, everything is fine after that. /cannot receive incremental stream: destination pool/path has been modified/ is that just me? -- ------------------------- Paul Macdonald IFDNRG Ltd Web and video hosting ------------------------- t: 0131 5548070 m: 07970339546 e: paul@ifdnrg.com w: http://www.ifdnrg.com ------------------------- IFDNRG 40 Maritime Street Edinburgh EH6 6SA ---------------------------------------------------- Virtual Servers from £50.00pm High specification Dedicated Servers from £150.00pm ----------------------------------------------------