Date: Wed, 9 Aug 2000 09:12:26 +0930 From: Greg Lehey <grog@lemis.com> To: "Kevin J. Menard, Jr." <kmenard@cisco.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: vinum beginner Message-ID: <20000809091226.I13974@wantadilla.lemis.com> In-Reply-To: <39900933.DB93CA7E@cisco.com>; from kmenard@cisco.com on Tue, Aug 08, 2000 at 09:20:51AM -0400 References: <200008071616.AAG59766@bucket.cisco.com> <20000808101009.C92263@wantadilla.lemis.com> <39900933.DB93CA7E@cisco.com>
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On Tuesday, 8 August 2000 at 9:20:51 -0400, Kevin J. Menard, Jr. wrote: > Greg Lehey wrote: > >> On Monday, 7 August 2000 at 12:07:22 -0400, Kevin Menard wrote: >>> Hi, >>> >>> I have thoroghly RTFM, but still have a question about vinum. I realize that / >>> cannot be mirroredd. I would imagine I would not want to mirror swap space and >>> /var, simply because they change so frequently and that would put unneeded >>> stress on the CPU. >> >> If you lose swap, you can crash your system. >> >>> Plus it really just doesn't make all that much sense to mirror >>> temporary data. >> >> That depends on how important it is while it's there. >> >>> My question is this though. If I have a 9770M drive, with a / = >>> 20M, /var = 50M, swap = 777M, and /usr = the rest, how would I go >>> about mirroring the rest of the drive? >> >> With 20 MB /, I don't think you'd get that far. Take at least 40 MB. >> And I'd be interested to know how you know that you need exactly 50 MB >> /var. >> >>> I mean, there's about 9 gigs of /usr data that could be mirrored. >> >> How many disks do you have? For mirroring you need at least 2. >> Mirroring on the same drive doesn't buy you much, just the possibility >> to recover from uncorrectable sector data errors. It does >> *significantly* add to the I/O time. >> >>> And if I changed the fs type for /usr to vinum, will that mess up >>> any other programs that might store data to /usr? >> >> The fs type relates to a partition, not a file system. > > Oops. I fluffed up a little. I'm too young to be losing my memory. Oh well. > I have / = 50M, /var = 20M, swap = 773M, and /usr takes up the remaing 8900M or so. > I didn't arbitrarily pick these values -- I let /stand/sysinstall do that for me. > > I have a total of 6 IDE drives. All of which are 10GB in size. I want to have two > striped plexes of 3 subdisks each. The second plex mirroring the first. > > Working well into the morning, I think I made some serious headway. I can create 5 > of the 6 drives from my physical HDDs. The one that fails (vinum told me so) is the > main HDD. I'm guessing I'm having trouble making /usr part of a plex because it is > in use at the time. I persevered regardless, and built the volume, and then it > segfaulted and FreeBSD restarted. I'm assuming this is because that first drive was > never really initialized as a drive. > > Hope I provided sufficient information to get a useful answer :-) No. Greg -- When replying to this message, please copy the original recipients. For more information, see http://www.lemis.com/questions.html Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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