From owner-freebsd-hackers Tue Oct 21 16:41:22 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id QAA18386 for hackers-outgoing; Tue, 21 Oct 1997 16:41:22 -0700 (PDT) (envelope-from owner-freebsd-hackers) Received: from cynic.portal.ca (root@cynic.portal.ca [204.174.36.7]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id QAA18373 for ; Tue, 21 Oct 1997 16:41:14 -0700 (PDT) (envelope-from cjs@portal.ca) Received: from localhost ([[UNIX: localhost]]) by cynic.portal.ca (8.8.5/8.8.5) with SMTP id QAA02947; Tue, 21 Oct 1997 16:40:27 -0700 (PDT) X-Authentication-Warning: cynic.portal.ca: cjs owned process doing -bs Date: Tue, 21 Oct 1997 16:40:27 -0700 (PDT) From: Curt Sampson Reply-To: Curt Sampson To: "Alexander B. Povolotsky" cc: hackers@FreeBSD.ORG, netbsd-users@netbsd.org Subject: Re: on ccd and large disk array In-Reply-To: <199710211052.OAA12808@asteroid.mgt.msk.ru> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk On Tue, 21 Oct 1997, Alexander B. Povolotsky wrote: > We're making a (relatively) large disk array using ccd: 5 Micropolis HDDs, > 8.7 Gb each, i.e. about 40 Gb total. > > Does anyone know possible traps on our way? Is FFS as-is stable on 40 Gb > filesystems? What may we need to patch? I can't see any reason why a little one like that would be a problem. :-) If you wanted to do a slightly larger one, you might follow the lead of NASA Ames Research Laboratory. Take a couple of racks of 9 x 9 GB drives and put a hardware RAID-5 across them, for about 150 GB of storage: sd9: 156260MB, 12594 cyl, 64 head, 141 sec, 512 bytes/sect x 320020992 sectors Then take 4 of those and put a ccd across it, and put FFS on that: Filesystem 1K-blocks Used Avail Capacity Mounted on /dev/ccd0a 637453560 8 605580872 0% /mnt That gives you a little over 600 GB on a single FFS. Of course, that's probably not enough storage, so you want to have a couple of those to bring it over a terrabite. This is NetBSD running on a smallish AlphaServer 8400 (only 2 GB RAM, 72 PCI slots [on 19 buses], one or two 800 MB HPPI buses). There's four more with similar amounts of storage kicking around the lab, too. (If you FreeBSD guys ever feel like upgrading that little FTP server of yours you have over at Walnut Creek, feel free to give us a call. :-)) cjs Curt Sampson cjs@portal.ca Info at http://www.portal.ca/ Internet Portal Services, Inc. Through infinite myst, software reverberates Vancouver, BC (604) 257-9400 In code possess'd of invisible folly.