From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:53242) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ROzNC-0000h1-A5 for qemu-devel@nongnu.org; Fri, 11 Nov 2011 17:14:59 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ROzNB-0006pJ-9B for qemu-devel@nongnu.org; Fri, 11 Nov 2011 17:14:58 -0500 Received: from v220110690675601.yourvserver.net ([78.47.199.172]:59094) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ROzNB-0006p7-1L for qemu-devel@nongnu.org; Fri, 11 Nov 2011 17:14:57 -0500 Message-ID: <4EBD9E36.1030100@weilnetz.de> Date: Fri, 11 Nov 2011 23:14:14 +0100 From: Stefan Weil MIME-Version: 1.0 References: <1321048006-16451-1-git-send-email-ronniesahlberg@gmail.com> <1321048006-16451-2-git-send-email-ronniesahlberg@gmail.com> In-Reply-To: <1321048006-16451-2-git-send-email-ronniesahlberg@gmail.com> Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH] Documentation: Add section about iSCSI LUNS to qemu-doc List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Ronnie Sahlberg Cc: kwolf@redhat.com, qemu-devel@nongnu.org Hi, I have only some small remarks, see my inline comments below. Am 11.11.2011 22:46, schrieb Ronnie Sahlberg: > Add a new section about using iSCSI LUNs with qemu > and provide a short example on how to set up a target and access it > using the built-in initiator > > Signed-off-by: Ronnie Sahlberg > --- > qemu-doc.texi | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++ > 1 files changed, 53 insertions(+), 0 deletions(-) > > diff --git a/qemu-doc.texi b/qemu-doc.texi > index 149e9bd..c1b293e 100644 > --- a/qemu-doc.texi > +++ b/qemu-doc.texi > @@ -421,6 +421,7 @@ snapshots. > * disk_images_fat_images:: Virtual FAT disk images > * disk_images_nbd:: NBD access > * disk_images_sheepdog:: Sheepdog disk images > +* disk_images_iscsi:: iSCSI LUNs > @end menu > > @node disk_images_quickstart > @@ -695,6 +696,58 @@ qemu-img create > sheepdog:@var{hostname}:@var{port}:@var{image} @var{size} > qemu sheepdog:@var{hostname}:@var{port}:@var{image} > @end example > > +@node disk_images_iscsi > +@subsection iSCSI LUNs > + > +iSCSI is a popular protocol used to access SCSI devices across a computer > +network. > + > +There are two different ways iSCSI devices can be used by QEMU. > + > +The first method is to mount the iSCSI LUN on the host, and make it > appear as > +any other ordinary SCSI device on the host and then to access this > device as a > +/dev/sd device from QEMU. How to do this differs between host OSes. > + > +The second method involves using the iSCSI initiator that is built into > +QEMU. This provides a mechanism that works the same way regardless of > which > +host OS you are running QEMU on. This section will describe this > second method > +of using iSCSI together with QEMU. > + > +In QEMU, iSCSI devices are described using special iSCSI URLs > + > +@example > +URL syntax: > +iscsi://[[%]@@][:]// > +@end example > + > +Username and password are optional and only used if your taget is set up taget -> target > +using CHAP authentication for access control. > +Alternatively the username and passwords can also be set via environment password instead of passwords? > +variables to have these not show up in the process list > + > +@example > +export LIBISCSI_CHAP_USERNAME= > +export LIBISCSI_CHAP_PASSWORD= > +iscsi://// > +@end example > + > +Howto set up a simple iSCSI target on loopback and accessing it via QEMU: > +@example > +Setting up a iSCSI target with one CDROM and one DISK: > +tgtd --iscsi portal=127.0.0.1:3260 > +tgtadm --lld iscsi --op new --mode target --tid 1 -T iqn.qemu.test > +tgtadm --lld iscsi --mode logicalunit --op new --tid 1 --lun 1 \ > + -b /IMAGES/disk.img --device-type=disk > +tgtadm --lld iscsi --mode logicalunit --op new --tid 1 --lun 2 \ > + -b /IMAGES/cd.iso --device-type=cd > +tgtadm --lld iscsi --op bind --mode target --tid 1 -I ALL > + > +qemu -boot d -drive file=iscsi://127.0.0.1/iqn.qemu.test/1 \ There is no qemu executable any longer. You may choose from a large number of executable names, e.g. qemu-system-i386. > + -cdrom iscsi://127.0.0.1/iqn.qemu.test/2 > +@end example > + > + > + > @node pcsys_network > @section Network emulation Thanks for providing this documentation. Kind regards, Stefan Weil