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Date: Mon, 16 Dec 2013 17:44:16 +0100
From: Rolf Grossmann <rg@progtech.net>
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To: freebsd-scsi@freebsd.org
Subject: camcontrol rescan not updating disk size?
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Hi,

I'm having a problem with a virtualized system. I've grown the virtual
disk, but my FreeBSD 9.1-STABLE r246991 won't recognize the new size:

# grep da1 /var/run/dmesg.boot
da1 at mpt0 bus 0 scbus2 target 1 lun 0
da1: <VMware Virtual disk 1.0> Fixed Direct Access SCSI-2 device
da1: 320.000MB/s transfers (160.000MHz DT, offset 127, 16bit)
da1: Command Queueing enabled
da1: 75776MB (155189248 512 byte sectors: 255H 63S/T 9660C)

# camcontrol readcap 2:1:0
Last Block: 314572799, Block Length: 512 bytes

# camcontrol rescan 2:1:0
Re-scan of 2:1:0 was successful

# geom disk list da1
Geom name: da1
Providers:
1. Name: da1
   Mediasize: 79456894976 (74G)
   Sectorsize: 512
   Mode: r1w1e1
   descr: VMware Virtual disk
   ident: (null)
   fwsectors: 63
   fwheads: 255

IMHO that should now read "Mediasize: 161061273088 (150G)".

(What I'm actually trying to do is "zpool online -e mypool da1", but
that doesn't recognize the new size either, so I'm thinking geom is a
good indicator of the system's idea of the disk size.)

I've tried a full and targetd rescan multiple times to no avail. I don't
see anything to rescan the size or flush some sort of cache. My Google
searches also came up empty. I'm out of ideas what else to try short of
a reboot (which I'd really like to avoid).

Thanks, Rolf.