On 01/29/2013 07:12 AM, torn5 wrote: > On 01/28/13 21:59, Mike Christie wrote: >> On 01/28/2013 02:55 PM, torn5 wrote: >>> Mike, thanks for your reply >>> >>> I actually need the blockdevice to be available (in blocked mode) just >>> after starting the initiator, even if the initiator wasn't able to >>> connect yet. >> Ah ok. That might not be possible. We have to be able to establish a >> tcp/ip connection before the scsi layer and udev can setup a block >> device. We have to have that connection so the scsi layer can ask the >> target what devices exist. >> >> So if the target is not up to the point where it is accepting >> connections then there is nothing we can do. >> >> However, if you had already connected to the target, then brought the >> target down, the block devices will stay setup while the target is down. >> They will just queue IO or fail IO depending on your settings. Not sure >> if that helps. > > Would it be possible to export from localhost (initiator host) a fake > version of the devices, so for iscsiadm to connect to localhost and > create the blockdevices, then disconnect from there keeping the > blockdevices available, and then try connecting to the real target?
I guess so. You could use a software target like IET, LIO, SCST or TGT. That would start up before the iscsi initiator. The initiator would connect to that at first. When your real target is up, you could bring down that software target and we could then connect to the real target. There are lots of details though. > > For this to work I need a kind of "target migration" feature of > open-iscsi: is it possible to reassign the target of the connection to > another IP:port on the fly, maybe by writing parameters to sysfs, > restarting iscsid or the like? > Most targets have a redirect feature where they can tell the initiator to log into some other target/portal. When your real target comes up you would have the sw target redirect the initiator to the hw target. Why do you need these block devices made at that time? -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/open-iscsi?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
