On Wed, Sep 23, 2015 at 05:21:00PM -0600, John Nielsen wrote:

> On Sep 23, 2015, at 3:25 PM, Edward Tomasz Napierala <tr...@freebsd.org> 
> wrote:
> > On 0923T0916, John Nielsen wrote:
> >> On Sep 23, 2015, at 2:12 AM, Yonas Yanfa <yo...@fizk.net> wrote:
> >> 
> >>> isboot is a iSCSI boot driver written by Daisuke Aoyama that allows you 
> >>> to boot your root partition using iSCSI.
> >> [,,,]
> >>> This was first announced way back in June, 2010:
> >>> 
> >>> https://lists.freebsd.org/pipermail/freebsd-scsi/2010-June/004425.html
> >>> 
> >>> I've tested the current version (v0.2.10) and it works with FreeBSD 10.2 
> >>> booting a ZFS on root installation:
> >>> 
> >>> http://www.peach.ne.jp/archives/isboot/isboot-0.2.10.tar.gz
> >>> 
> >>> I've used iSCSI boot with Ubuntu Server for a while and it's been very 
> >>> useful. I'm looking forward to FreeBSD having the same capability 
> >>> built-in.
> >> 
> >> +1. I have used this module in the past and it is extremely useful. Thanks 
> >> for the pointer, I wasn't aware it had been updated for FreeBSD 10.x so 
> >> recently. I've also wondered why this is not part of FreeBSD by default.
> >> 
> >> Aoyama-san, do you have any objection to this code being included in 
> >> FreeBSD? If not, can you formally assign it a BSD or other friendly 
> >> license? Thank you again for the work!
> >> 
> >> Trasz (or anyone), is there other work to support iSCSI booting and/or 
> >> IBFT on FreeBSD? Anything else isboot might conflict with? Any problems 
> >> with integrating the code or with the code itself?
> > 
> > The basic problem with isboot is that it only works with the old iSCSI
> > initiator, which is now marked obsolete.  AFAIK there is no ready solution
> > that works with the new one - however, it should be possible to use upcoming
> > reroot support to achieve this: boot with a temporary rootfs, mounted from
> > a ramdisk preloaded by loader(8), setup an iSCSI session, and then replace
> > the temporary rootfs with the real one, mounted over iSCSI.
> Ah, thank you for clarifying. I forgot that 10.x still supports the old 
> initiator.
> The reroot approach sounds interesting but less straightforward. The beauty 
> of isboot is that the kernel-loaded from a normal root disk that happens to 
> be iSCSI-connected-knows how to re-establish its network and iSCSI 
> connections just from the information in the iSCSI Boot Firmware Table, i.e. 
> native iSCSI booting. I'd love to see the same approach continued with the 
> new initiator. I suspect that a new implementation could re-use all of the 
> IBFT code and most of the networking code, but I don't know how hard the 
> remaining pieces would be. I may have a chance to look in to it but a kernel 
> programmer I am not, sadly.
> I think a "native" iSCSI reroot approach could be feasible at some
> point; for me that would mean that the loader could load the kernel
> and a standard-ish (or easily auto-generated) mfsroot from the iSCSI
> volume seamlessly, then something in the mfsroot parses the IBFT and
> sets up the network and iSCSI connections before switching root.

mfsroot auto-generated by loader? cool for stay in sync mfsroot with
main tree.

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