Date: Mon, 8 Mar 1999 16:56:59 +1030 From: Greg Lehey <grog@lemis.com> To: Ludwig Pummer <ludwigp@bigfoot.com>, tim@scratch.demon.co.uk, freebsd-questions@FreeBSD.ORG Subject: Re: vinum (how to use after creation) Message-ID: <19990308165659.U490@lemis.com> In-Reply-To: <4.1.19990307201038.00a05ee0@mail-r>; from Ludwig Pummer on Sun, Mar 07, 1999 at 08:17:53PM -0800 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>
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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
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