> > > After the new logical drives are created with "- - -" written to the > > scsi_host scan attribute, there is a highly noticeable delay before > device > > names (e.g., sda) appears in the /dev directory. If the management > > application tried to access the device immediately after creating new, > the > > access fails. Putting a 1 second delay helped, but of course this is not > a > > deterministic solution. > > > > What are the other possibilities? > > Well, how about hotplug. The device addition actually triggers a hot > plug event already (there's no need to add anything, it's done by the > mid-layer), so if you just listen for that, you'll know when the scan > has detected a device.
After writing the "- - -" to the scan attribute, the management applications assume the udev has created the relevant entries in the /dev directly and try to use the devices _immediately_ and fail to see the devices Is there a hotplug event which would tell the management applications that the device nodes have actually been created now and ready to be used? I tried this simple script to re-create the failure. Assume there is one scsi disk, which is the installation disk. Now load the megaraid driver, with a few logical drive already created. # insmod megaraid_mm.ko; insmod megaraid_mbox.ko; ls -l /dev/sd* <driver loads> <not all scsi devices are available> <try again after a brief delay> # ls -l /dev/sd* # all devices show up now Thanks -Atul - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
