Date: Fri, 17 Sep 2004 20:09:59 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Brooks Davis <brooks@one-eyed-alien.net> 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: <20040917180959.GU30151@darkness.comp.waw.pl> In-Reply-To: <20040917171503.GB10367@odin.ac.hmc.edu> References: <98480.1095438391@critter.freebsd.dk> <414B10FB.9030003@samsco.org> <20040917170302.GT30151@darkness.comp.waw.pl> <20040917171503.GB10367@odin.ac.hmc.edu>
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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.:)
--
Pawel Jakub Dawidek http://www.FreeBSD.org
pjd@FreeBSD.org http://garage.freebsd.pl
FreeBSD committer Am I Evil? Yes, I Am!
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