From nobody Sat Nov 5 18:39:34 2022 X-Original-To: questions@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4N4R9s6f3Cz4gslT for ; Sat, 5 Nov 2022 18:39:45 +0000 (UTC) (envelope-from 4250.82.1d4f60000bc255b.4b5474761b24763c397f2c71d2973bcf@email-od.com) Received: from s1-b0c6.socketlabs.email-od.com (s1-b0c6.socketlabs.email-od.com [142.0.176.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4N4R9r4gmGz3cCd for ; Sat, 5 Nov 2022 18:39:44 +0000 (UTC) (envelope-from 4250.82.1d4f60000bc255b.4b5474761b24763c397f2c71d2973bcf@email-od.com) DKIM-Signature: v=1; a=rsa-sha256; d=email-od.com;i=@email-od.com;s=dkim; c=relaxed/relaxed; q=dns/txt; t=1667673585; x=1670265585; h=content-transfer-encoding:content-type:mime-version:references:in-reply-to:message-id:subject:to:from:date:x-thread-info:subject:to:from:cc:reply-to; bh=2cebtnF7yjH/DrK5M+64ivQm3m+jLCKlgtu+J2I+sJg=; b=rycoMXB3WrgXlnK66nQ+gpfGzRzDUfvEHNAEgu8Wu1zJHwYIwuSlMk9WDtIW8gi9650cgDZBh/021gwATkp0qGwCNI3Drt1PCQJLQTI5fOnjAUeYbQI5/zKJpeF6Gxh8BkcjzAH3G29O+A7rNTKnbs0g7iaSVw44537sfEhlgRo= X-Thread-Info: NDI1MC4xMi4xZDRmNjAwMDBiYzI1NWIucXVlc3Rpb25zPWZyZWVic2Qub3Jn Received: from r2.us-east-1.aws.in.socketlabs.com (r2.us-east-1.aws.in.socketlabs.com [142.0.191.2]) by mxsg2.email-od.com with ESMTP(version=Tls12 cipher=Aes256 bits=256); Sat, 5 Nov 2022 14:39:36 -0400 Received: from smtp.lan.sohara.org (EMTPY [185.202.17.215]) by r2.us-east-1.aws.in.socketlabs.com with ESMTP(version=Tls12 cipher=Aes256 bits=256); Sat, 5 Nov 2022 14:39:35 -0400 Received: from [192.168.63.1] (helo=steve.lan.sohara.org) by smtp.lan.sohara.org with smtp (Exim 4.94.2 (FreeBSD)) (envelope-from ) id 1orO4s-000CSf-MK for questions@freebsd.org; Sat, 05 Nov 2022 18:39:34 +0000 Date: Sat, 5 Nov 2022 18:39:34 +0000 From: Steve O'Hara-Smith To: questions@freebsd.org Subject: Re: Setting up ZFS L2ARC on a zvol Message-Id: <20221105183934.9292e9232983713de5e1e3f8@sohara.org> In-Reply-To: References: X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.33; amd64-portbld-freebsd13.0) X-Clacks-Overhead: "GNU Terry Pratchett" List-Id: User questions List-Archive: https://lists.freebsd.org/archives/freebsd-questions List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4N4R9r4gmGz3cCd X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=email-od.com header.s=dkim header.b=rycoMXB3; dmarc=none; spf=pass (mx1.freebsd.org: domain of 4250.82.1d4f60000bc255b.4b5474761b24763c397f2c71d2973bcf@email-od.com designates 142.0.176.198 as permitted sender) smtp.mailfrom=4250.82.1d4f60000bc255b.4b5474761b24763c397f2c71d2973bcf@email-od.com X-Spamd-Result: default: False [-2.70 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-1.000]; MV_CASE(0.50)[]; FORGED_SENDER(0.30)[steve@sohara.org,4250.82.1d4f60000bc255b.4b5474761b24763c397f2c71d2973bcf@email-od.com]; R_SPF_ALLOW(-0.20)[+ip4:142.0.176.0/20]; R_DKIM_ALLOW(-0.20)[email-od.com:s=dkim]; MIME_GOOD(-0.10)[text/plain]; MLMMJ_DEST(0.00)[questions@freebsd.org]; RCVD_TLS_LAST(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[142.0.191.2:received]; MIME_TRACE(0.00)[0:+]; FROM_NEQ_ENVFROM(0.00)[steve@sohara.org,4250.82.1d4f60000bc255b.4b5474761b24763c397f2c71d2973bcf@email-od.com]; ASN(0.00)[asn:7381, ipnet:142.0.176.0/22, country:US]; ARC_NA(0.00)[]; RCVD_COUNT_THREE(0.00)[4]; MID_RHS_MATCH_FROM(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; DKIM_TRACE(0.00)[email-od.com:+]; TO_DN_NONE(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; DMARC_NA(0.00)[sohara.org]; DWL_DNSWL_NONE(0.00)[email-od.com:dkim] X-ThisMailContainsUnwantedMimeParts: N On Sat, 5 Nov 2022 10:39:53 -0700 David Christensen wrote: > ZPOOLCONCEPTS(7) for both 12.3-R [1] and 13.1-R [2]: > > "Virtual devices cannot be nested, so a mirror or raidz virtual device > can only contain files or disks. Mirrors of mirrors (or other > combinations) are not allowed. Of course you can cheat to some extent using iscsi - I've used an iscsi mounted zvol as a zfs mirror for an SSD in a laptop. -- Steve O'Hara-Smith