From owner-freebsd-questions Sun Mar 7 22:27:32 1999 Delivered-To: freebsd-questions@freebsd.org Received: from allegro.lemis.com (allegro.lemis.com [192.109.197.134]) by hub.freebsd.org (Postfix) with ESMTP id 69D4C14CCB for ; Sun, 7 Mar 1999 22:27:25 -0800 (PST) (envelope-from grog@freebie.lemis.com) Received: from freebie.lemis.com (freebie.lemis.com [192.109.197.137]) by allegro.lemis.com (8.9.1/8.9.0) with ESMTP id QAA27767; Mon, 8 Mar 1999 16:57:06 +1030 (CST) Received: (from grog@localhost) by freebie.lemis.com (8.9.3/8.9.0) id QAA14996; Mon, 8 Mar 1999 16:57:00 +1030 (CST) Message-ID: <19990308165659.U490@lemis.com> Date: Mon, 8 Mar 1999 16:56:59 +1030 From: Greg Lehey To: Ludwig Pummer , tim@scratch.demon.co.uk, freebsd-questions@FreeBSD.ORG Subject: Re: vinum (how to use after creation) References: <4.1.19990307101720.00c13100@mail-r> <199903071254.MAA02531@franklin.matlink> <4.1.19990307101720.00c13100@mail-r> <19990308143012.M490@lemis.com> <4.1.19990307201038.00a05ee0@mail-r> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.93.2i In-Reply-To: <4.1.19990307201038.00a05ee0@mail-r>; from Ludwig Pummer on Sun, Mar 07, 1999 at 08:17:53PM -0800 WWW-Home-Page: http://www.lemis.com/~grog Organization: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-41-739-7062 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Sunday, 7 March 1999 at 20:17:53 -0800, Ludwig Pummer wrote: > At 08:00 PM 3/7/99 , Greg Lehey wrote: >> On Sunday, 7 March 1999 at 10:29:50 -0800, Ludwig Pummer wrote: >>> At 04:54 AM 3/7/99 , tim@scratch.demon.co.uk wrote: >>>> I have managed to create some vinum drives as follows >>> It appears your subdisks are all from the same physical drive. Why would >>> you do this? Why not just use one usr.p0.s0 with size of 4076? >> >> I don't see this. There's nothing in this list that shows the >> location of the subdisks, and I assumed he was using a lot of >> different relatively small disks to get a large volume. If they *are* >> all on the same disk, of course, it doesn't make sense, and if the >> plex were striped, it could cause a terrible loss of performance. > > Tim took this onto -chat. I thought he appeared to be using one disk > because the POs and subdisk sizes perfectly matched... Yes, they always do with a concatenated plex, unless there is a subdisk missing. PO stands for plex offset, which in the case of a concatenated plex is the starting point of the subdisk in the plex. In the case of RAID-5 and striped plexes, it's the offset from the beginning of the plex to the first stripe on that subdisk, so it'll show increments of stripe size. > Tim explained that he was experimenting with vinum and ended up with > all of these small subdisks on one drive. Ah. I couldn't know that. >> Without knowing what he wants to use it for, you can't recommend the >> 8192 byte blocks. > > 8192 byte blocks & 1024 byte frags are the default (at least, according to > sysinstall, when you choose 'newfs options' from the partition > editor). Hmm. So they are. I could have sworn they used to be 4K. OK, if they're the default, you don't need to specify them. Greg -- See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message