I've been combing the web for a couple days, and most hits I'm finding
regarding using a btrfs subvolume as an iSCSI target are posts from the
2009/2010 timeframe stating that that functionality is broken.
I'm working on a couple projects here, and one of those involves the
research into iSCSI targets and initiators, and the testing thereof. I
have an F20 system with a 1.3TB btrfs master subvolume (across three
dissimilar devices), and want to create a subvolume within that to serve
as an iSCSI target.
The traditional methods, specifically those mentioned in the Fedora Wiki
and the tgtadm man pages, place the emphasis on using devices (/dev/sdx)
or files (dd if=/dev/zero of=/array/target1 bs=1k count=1). I realize
that using the file is probably the easiest thing to do in this
instance, but that's not the point of my project - I am intentionally
trying to designate the btrfs subvolume as the target.
The issue I believe that is going to stop me is that tgtadm expects a
block device as the target, and btrfs does not provide that. Is there a
workaround, other than using a file in the subvolume as the target? Is
there work in progress to enable this feature, either in the
scsi-target-utils package or within the btrfs framework?
--
Dan Mossor
Systems Engineer at Large
Fedora QA Team Volunteer FAS: dmossor IRC: danofsatx
San Antonio, Texas, USA
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