On Tue, 2010-04-13 at 23:23 +0400, Vladislav Bolkhovitin wrote: > Nicholas A. Bellinger, on 04/13/2010 10:37 PM wrote: > > On Tue, 2010-04-13 at 21:09 +0400, Vladislav Bolkhovitin wrote: > >> LIO doesn't support 1 to many pass-through devices sharing, so SCST in > >> the only option. > > > > Sorry, but this statement about your perceived limitiations wrt TCM/LIO > > is completely incorrect. > > > > Using a single passthrough backstore device (eg: plain /dev/sdX) with > > TCM/pSCSI (or any TCM subsystem plugin) has been supported since the > > dawn of time to allow for any number of TCM_Loop Virtual SAS Ports with > > SG_IO going into KVM Guest. The same is also true for LIO-Target > > (iSCSI) and TCM_FC (FCoE) ports as well regardless of TCM subsystem > > backstore. > > > > Perhaps you would be so kind to provide a TCM/LIO source code reference > > from where you came up with this make-believe notion..? > > I've just rechecked with the latest > git://git.kernel.org/pub/scm/linux/kernel/git/nab/lio-core-2.6.git and > still wasn't able to find in LIO required pieces of functionality to > support 1 to many pass-through. I see only code for non-enforced 1 to 1 > pass-through (single initiator only). You can use with it more > initiators only as the SCSI violation, from pointing on which I started > my participation in this discussion. > Sorry, but listing the path to my git tree on k.o is not the same as citing a actual TCM/LIO source+line reference. > Particularly, I can't see the code, which in pass-through mode upon > receive of RESERVE command sends it also to the backend device, if > necessary (i.e. only the first time), and then sends RELEASE command to > the device upon the reservation holder removal. Could you point me on > the *exact* code which implements that? > Again, since *you* are the one making a claim, *you* are the one expected to back it up with a concrete code reference and example scenario. Please, do the leg-work yourself wrt TCM SPC-3 persisetent reservations and legacy SPC-2 reservations instead of expecting me to do the actual work for you to verify your own fanciful claims about target mode, seriously.. So, short of you being able to produce a response that is concrete and human-readable, your claim will once again be dismissed as generic hand-waving. --nab -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
