cvs commit: src/sys/sys mdioctl.h src/sys/dev/md md.c src/sbin/mdconfig Makefile mdconfig.8 mdconfig.c

Pawel Jakub Dawidek pjd at
Fri Sep 17 11:10:02 PDT 2004

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
        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
Stripesize: 4096
ID: 2239096935
1. Name: stripe/foo
   Mediasize: 2111062324805632 (1.9P)
   Sectorsize: 512
   Mode: r0w0e0
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             
pjd at                 
FreeBSD committer                         Am I Evil? Yes, I Am!
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