From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from firstgate.proxmox.com (firstgate.proxmox.com [212.224.123.68]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.proxmox.com (Postfix) with ESMTPS id 4F19D719DC for ; Fri, 9 Apr 2021 08:54:09 +0200 (CEST) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id 3B44322387 for ; Fri, 9 Apr 2021 08:54:09 +0200 (CEST) Received: from proxmox-new.maurer-it.com (proxmox-new.maurer-it.com [212.186.127.180]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by firstgate.proxmox.com (Proxmox) with ESMTPS id 91E442237C for ; Fri, 9 Apr 2021 08:54:08 +0200 (CEST) Received: from proxmox-new.maurer-it.com (localhost.localdomain [127.0.0.1]) by proxmox-new.maurer-it.com (Proxmox) with ESMTP id 5804F41FCE; Fri, 9 Apr 2021 08:54:08 +0200 (CEST) Date: Fri, 09 Apr 2021 08:54:01 +0200 From: Fabian =?iso-8859-1?q?Gr=FCnbichler?= To: Geoff Seeley , Proxmox VE user list References: <1052148244.1615.1617905219488@webmail.proxmox.com> In-Reply-To: <1052148244.1615.1617905219488@webmail.proxmox.com> MIME-Version: 1.0 User-Agent: astroid/0.15.0 (https://github.com/astroidmail/astroid) Message-Id: <1617951199.q66a123ls2.astroid@nora.none> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-SPAM-LEVEL: Spam detection results: 0 AWL 0.027 Adjusted score from AWL reputation of From: address KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment RCVD_IN_DNSWL_MED -2.3 Sender listed at https://www.dnswl.org/, medium trust SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_PASS -0.001 SPF: sender matches SPF record URIBL_BLOCKED 0.001 ADMINISTRATOR NOTICE: The query to URIBL was blocked. See http://wiki.apache.org/spamassassin/DnsBlocklists#dnsbl-block for more information. [klarasystems.com] Subject: Re: [PVE-User] PBS and ZFS Pools Compression? X-BeenThere: pve-user@lists.proxmox.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Proxmox VE user list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 09 Apr 2021 06:54:09 -0000 On April 8, 2021 8:06 pm, Dietmar Maurer wrote: >> This is a good article on the subject: >> https://klarasystems.com/articles/openzfs1-understanding-transparent-com= pression/ >=20 > Can't find where the explain it. ZFS magically detects if data is compres= sible? > Please can someone give me a hint how they do that? no. they compress, and if the result is over a certain threshold, they=20 save the uncompressed data to avoid the decompress overhead for barely=20 any/no gain. =