On Mar 12, 2014, at 6:18 PM, Rick Stevens <ricks@xxxxxxxxxxxxxx> wrote: > On 03/12/2014 04:23 PM, Dan Mossor issued this missive: >> 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? > > iSCSI stands for "internet SCSI", a way to share raw devices over normal > network mechanisms rather than having to have a storage farm (e.g. > fiberchannel switches or SAS concentrators and a ton of cables). As far > as I know, the functionality you want will never be available. iSCSI > is intended to share raw devices, not subdirectories (that's what things > like NFS and CIFS are for). It's a reasonable inquiry as ZFS does support iSCSI export of a zvol, but this is built into ZFS directly. https://btrfs.wiki.kernel.org/index.php/Project_ideas#block_devices_.27btrvols.27 No one has taken this yet though, so no work so far. Chris Murphy -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
