On 17/02, wangxu198...@gmail.com wrote: > Hi Gorka > > Definitely, the "AEN/AER" approach deserves a try, I will let you know if > it's applicable for my situation. > > For the sysfs way, do you mean echo a command to the host like below: > > echo "c t l" > "/sys/class/scsi_host/host#/scan" >
Yes, replacing c, t, l, and # with the corresponding values. You can find it explained in here https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/Online_Storage_Reconfiguration_Guide/adding_storage-device-or-path.html Cheers, Gorka. > > Thanks > Peter > > 在 2017年2月15日星期三 UTC+8下午11:52:19，Gorka Eguileor写道： > > > > On 15/02, Peter Wang wrote: > > > Hi > > > > > > I am investing new ways to discover LUN exposed by iSCSI targets. > > > > > > Currently, most of tools/libs are using user land shell commands > > "iscsiadm" > > > to login targets or rescan new LUNs. > > > sometimes, as I observed, the rescan is time-consuming. in > > high-concurrency > > > environment, the overhead by executing massive shell commands cannot be > > > ignored. > > > > > > So, my question is: can we use socket or other efficient ways to trigger > > > actions that we do with "iscsiadm"? > > > > > > Appreciate if you can help on this. > > > > > > Thanks > > > Peter > > > > > > > Hi Peter, > > > > I'm no expert, but if you are already logged in and your target supports > > AEN/AER packets, then iscsid will automatically send a scan request to > > discover changed LUNs, and if it doesn't support it you could use the > > sysfs interface from your code and request a scan writing "c t l" (where > > c=channel t=target l=lun and wildcard - can be used) to > > /sys/class/scsi_host/host#/scan. > > > > I know this is not what you were looking for, but maybe it can alleviate > > your issues until someone with more knowledge gives you the silver > > bullet you wanted. > > > > Cheers, > > Gorka. > > > > -- > 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 open-iscsi+unsubscr...@googlegroups.com. > To post to this group, send email to open-iscsi@googlegroups.com. > Visit this group at https://groups.google.com/group/open-iscsi. > For more options, visit https://groups.google.com/d/optout. -- 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 open-iscsi+unsubscr...@googlegroups.com. To post to this group, send email to open-iscsi@googlegroups.com. Visit this group at https://groups.google.com/group/open-iscsi. For more options, visit https://groups.google.com/d/optout.
