From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lists.gentoo.org ([140.105.134.102] helo=robin.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1IZ8st-0006L7-CI for garchives@archives.gentoo.org; Sat, 22 Sep 2007 17:35:16 +0000 Received: from robin.gentoo.org (localhost [127.0.0.1]) by robin.gentoo.org (8.14.1/8.14.0) with SMTP id l8MHNsHx010044; Sat, 22 Sep 2007 17:23:54 GMT Received: from vms042pub.verizon.net (vms042pub.verizon.net [206.46.252.42]) by robin.gentoo.org (8.14.1/8.14.0) with ESMTP id l8MHNrwX010039 for ; Sat, 22 Sep 2007 17:23:54 GMT Received: from gw.thefreemanclan.net ([71.242.217.11]) by vms042.mailsrvcs.net (Sun Java System Messaging Server 6.2-6.01 (built Apr 3 2006)) with ESMTPA id <0JOS00GKA5NHX434@vms042.mailsrvcs.net> for gentoo-amd64@lists.gentoo.org; Sat, 22 Sep 2007 12:23:42 -0500 (CDT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by gw.thefreemanclan.net (Postfix) with ESMTP id 59C44124082 for ; Sat, 22 Sep 2007 13:23:40 -0400 (EDT) Date: Sat, 22 Sep 2007 13:23:39 -0400 From: Richard Freeman Subject: Re: [gentoo-amd64] What should the swap size be for 4G ram? In-reply-to: <200709221722.31174.volker.armin.hemmann@tu-clausthal.de> To: gentoo-amd64@lists.gentoo.org Message-id: <46F54F9B.6090006@thefreemanclan.net> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-amd64@gentoo.org Reply-to: gentoo-amd64@lists.gentoo.org MIME-version: 1.0 Content-type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary=------------ms030200040700080101030109 OpenPGP: id=A6665569 X-Enigmail-Version: 0.95.2 References: <46F488FA.5070104@singnet.com.sg> <46F48A5E.9050703@singnet.com.sg> <46F53191.8040204@thefreemanclan.net> <200709221722.31174.volker.armin.hemmann@tu-clausthal.de> User-Agent: Thunderbird 2.0.0.6 (X11/20070813) X-Archives-Salt: f5a174e3-1255-4764-821f-4279d83fd66f X-Archives-Hash: 684839423969016fcd3bfdde4a41a71d This is a cryptographically signed message in MIME format. --------------ms030200040700080101030109 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Volker Armin Hemmann wrote: > why? zfs is slow and is mixing things that should be in different layers. One > argument against reiser4 always was 'it violates the layering' - well this is > even more true for zfs. > If you can suggest a filesystem that has full redundancy and uses all my disk space optimally I'll be happy to use it. :) Ideally I'd prefer not to have to carefully map and partition my drives and be able to add space on a whim, but maybe that is asking too much. But ZFS allows all of this. RAID5 does not. In theory ZFS also has much better write performance than RAID5 - because it doesn't need to read stripe before writing them most of the time. Sure, it is a layering violation, but there really isn't any way to implement this sort of scheme using layers. If you separate the raid layer from the FS layer then the raid has no idea whether a given block of disk is safe to overwrite or not - so it has to read stripes before writing them. So, while I do like the flexibility of running any filesystem on top of any lvm/md scheme I'll live with the inflexibility if it gives me more capability. As far as performance goes - ZFS is pretty immature - I'm sure it will only improve. Especially considering it only has the most minimal support for linux right now. 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