Date: Tue, 01 Oct 1996 12:43:23 -0700 From: James Graham <greywolf@siva.captech.com> To: Jason Thorpe <thorpej@nas.nasa.gov> Cc: "Kevin P. Neal" <kpneal@pobox.com>, hackers@freebsd.org, tech-kern@netbsd.org Subject: Re: VPS mailing list, BSD interest? Message-ID: <199610011943.MAA20686@siva> In-Reply-To: Your message of "Tue, 01 Oct 1996 09:11:18 PDT." <199610011611.JAA00870@lestat.nas.nasa.gov>
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Jason Thorpe sez: # # [Poul-Henning Camp sez]: # > There is no significant difference between the FDISK, bsd-disklabel, # > mirror, stripeing and raid 5 operations. They all translate a # > (dev+blkno+len) tupple to one or more similar tupples. 1. Minor nit: (x+y+z) is a triple, not a tuple. 2. There is no difference between the operations? You've obviously not dealt with a RAID5 filesystem before. Nice idea, but you pay for it with performance. And yes, I consider performance significant. The first time I ran the ccdconfig thing and tried to newfs it, I ended up running it on unevenly sized filesystems (OK) with an interleave of 1 (NOT OK!). Boy, was THAT _slow_! Not to mention I wanted concatenation anyway... :-) I haven't had the opportunity to stripe or mirror a filesystem yet (insufficient disk space and differently-sized disks make this a bit of a challenge), so I can't comment on performance. But it's nice to have the concatenation as when I partitioned my disks, I had one piddly partition of 70MB left over. Seeing as that wasn't really enough with which to do jack, I concatenated it to my user disk. # # Jason R. Thorpe thorpej@nas.nasa.gov # NASA Ames Research Center Home: 408.866.1912 # NAS: M/S 258-6 Work: 415.604.0935 # Moffett Field, CA 94035 Pager: 415.428.6939 --*greywolf;
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