From owner-freebsd-geom@FreeBSD.ORG Sun Sep 23 21:35:50 2007 Return-Path: Delivered-To: freebsd-geom@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 7208C16A417 for ; Sun, 23 Sep 2007 21:35:50 +0000 (UTC) (envelope-from gcubfg-freebsd-geom@m.gmane.org) Received: from ciao.gmane.org (main.gmane.org [80.91.229.2]) by mx1.freebsd.org (Postfix) with ESMTP id CE57113C45A for ; Sun, 23 Sep 2007 21:35:49 +0000 (UTC) (envelope-from gcubfg-freebsd-geom@m.gmane.org) Received: from list by ciao.gmane.org with local (Exim 4.43) id 1IZZ70-0001Ah-58 for freebsd-geom@freebsd.org; Sun, 23 Sep 2007 21:35:34 +0000 Received: from 89-172-44-225.adsl.net.t-com.hr ([89.172.44.225]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 23 Sep 2007 21:35:34 +0000 Received: from ivoras by 89-172-44-225.adsl.net.t-com.hr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 23 Sep 2007 21:35:34 +0000 X-Injected-Via-Gmane: http://gmane.org/ To: freebsd-geom@freebsd.org From: Ivan Voras Date: Sun, 23 Sep 2007 23:35:15 +0200 Lines: 38 Message-ID: References: <20070921143318.GC5690@garage.freebsd.pl> <20070921170506.GB9445@garage.freebsd.pl> <1310567292.20070921235802@gmail.com> <20070922011847.GH9445@garage.freebsd.pl> <1231480340.20070922112446@gmail.com> <20070922111958.GA1614@garage.freebsd.pl> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigACE0CE5402A75E37DFC13772" X-Complaints-To: usenet@sea.gmane.org X-Gmane-NNTP-Posting-Host: 89-172-44-225.adsl.net.t-com.hr User-Agent: Thunderbird 2.0.0.6 (Windows/20070728) In-Reply-To: <20070922111958.GA1614@garage.freebsd.pl> X-Enigmail-Version: 0.95.3 Sender: news Subject: Re: raidtest for zfs X-BeenThere: freebsd-geom@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: GEOM-specific discussions and implementations List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 23 Sep 2007 21:35:50 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigACE0CE5402A75E37DFC13772 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Pawel Jakub Dawidek wrote: > ZFS ZVOL doesn't present raw blocks to use, like graid3/graid5, so it's= > quite possible that because of how the data was written and how ZFS > prefetches the data it's faster than one disk. So does ZVOL actually offer "cooked" data to its users (caching, lazy allocation?), similar to what would happen if the entire ZVOL was one big file in a "normal" ZFS file system? Slightly off-topic: for most file systems, it used to be recommended that "lots of smallish files" be distributed in lots of directories in a radix-like fashion instead of keeping all files in one huge directory. Do you know if ZFS does something to help this situation, or are the old rules of thumb still applicable? --------------enigACE0CE5402A75E37DFC13772 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFG9twTldnAQVacBcgRApujAKDR3sqoICUAm6M6ZMTlx+ZkgBOGewCfRa4c 8knVXM+Xs0al+LaMSXs7ty8= =CjT4 -----END PGP SIGNATURE----- --------------enigACE0CE5402A75E37DFC13772--