Date: Fri, 17 Sep 2004 11:49:29 -0700 From: Brooks Davis <brooks@one-eyed-alien.net> To: Pawel Jakub Dawidek <pjd@FreeBSD.org> Cc: Ceri Davies <ceri@submonkey.net> Subject: Re: cvs commit: src/sys/sys mdioctl.h src/sys/dev/md md.c src/sbin/mdconfig Makefile mdconfig.8 mdconfig.c Message-ID: <20040917184929.GB22747@odin.ac.hmc.edu> In-Reply-To: <20040917180959.GU30151@darkness.comp.waw.pl> References: <98480.1095438391@critter.freebsd.dk> <414B10FB.9030003@samsco.org> <20040917170302.GT30151@darkness.comp.waw.pl> <20040917171503.GB10367@odin.ac.hmc.edu> <20040917180959.GU30151@darkness.comp.waw.pl>
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[-- Attachment #1 --] On Fri, Sep 17, 2004 at 08:09:59PM +0200, Pawel Jakub Dawidek wrote: > On Fri, Sep 17, 2004 at 10:15:03AM -0700, Brooks Davis wrote: > +> > Pages. It gives as maximum swap-backed device of 16TB. I tested it with > +> > ~15TB devices, so there is no signed/unsigned problem (which will limit > +> > us to 8TB). Of course you can always (I hope) increase page size:) > +> > +> Given my quick read of the sunlabel format, there would be some value in > +> >16TB (17 would be sufficent) virtual disks. Can we do a RAID0 of these > +> to get something that big? I'm pretty sure sunlabel is limited to 14TB > +> or 16TB so having something too big would be good for testing. > > You mean setup raid0 with md(4) device to get more than 16TB? Sure, at > least with gstripe: > > ragepxe:root:~# diskinfo -v /dev/stripe/foo > /dev/stripe/foo > 512 # sectorsize > 2111062324805632 # mediasize in bytes (1.9P) > 4123168603136 # mediasize in sectors > > ragepxe:root:~# gstripe list > Geom name: foo > State: UP > Status: Total=128, Online=128 > Type: AUTOMATIC > Stripesize: 4096 > ID: 2239096935 > Providers: > 1. Name: stripe/foo > Mediasize: 2111062324805632 (1.9P) > Sectorsize: 512 > Mode: r0w0e0 > Consumers: > 1. Name: md0 > Mediasize: 16492674416640 (15T) > Sectorsize: 512 > Mode: r0w0e0 > Number: 0 > [...] > 128. Name: md127 > Mediasize: 16492674416640 (15T) > Sectorsize: 512 > Mode: r0w0e0 > Number: 127 > > 1.9 Petabytes will be enough?:) Hehe, great fun BTW.:) Just what I was looking for. Very cool! -- Brooks -- Any statement of the form "X is the one, true Y" is FALSE. PGP fingerprint 655D 519C 26A7 82E7 2529 9BF0 5D8E 8BE9 F238 1AD4 [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQFBSzG4XY6L6fI4GtQRAuDkAJ9es6pSJQtqgD4GvavNYvys6IpJ7ACeOpHa vrjn9Ybkyuiu+oUZAaP2sGo= =LIP3 -----END PGP SIGNATURE-----
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