Date: Wed, 02 Oct 1996 15:44:14 +1000 From: matthew green <mrg@eterna.com.au> To: "Kevin P. Neal" <kpneal@pobox.com> Cc: "Justin T. Gibbs" <gibbs@freefall.freebsd.org>, Jason Thorpe <thorpej@nas.nasa.gov>, Poul-Henning Kamp <phk@critter.tfs.com>, James Graham <greywolf@siva.captech.com>, hackers@freebsd.org, tech-kern@netbsd.org, buhrow@cats.ucsc.edu (Brian Buhrow) Subject: Re: VPS mailing list, BSD interest? Message-ID: <199610020544.PAA18948@eterna.com.au> In-Reply-To: Your message of "Wed, 02 Oct 1996 01:26:37 -0400." <1.5.4.32.19961002052637.008e9d0c@mindspring.com>
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i will note that ODS allows mirrored root filesystems. i don't remember anything about disallowing stripping or concatenating them, either, but they will ignore the disklabel/bootblock portion on disk. i like parts of ODS: it keeps state in dedicated partitions on the disk, a metadevice db "replica". you create several of these partitions on your disks and it uses them to keep state -- each one is independant or the others. i also like the model of ODS (as under solaris 2): - a metadevice acts like a normal disk partition - a metadevice can be composed of any number of real partitions or metadevices, either concatenated or striped, or mirrored. you create a mirrored stripe by creating two (or three -- ODS has an, IMO, stpuid limit) stripes and then mirroring these two metadevices. recent ODS versions include raid5 support, file system extensions, etc. i'm fairly conversant in ODS if anyone has other questions.
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