Constraints:
1) Can't count on udev rules to run 'multipath' (see bug 1431650)
Ideas:
0) sleep when there's no scsi_wait_scan module. (below)
1) make sure related SCSI modules are loaded before scsi_complete_async_scans()
(drivers/scsi/scsi_scan.c) is called.
2) loop waiting for the number of SCSI disks to settle (maybe check /sys,
/dev/, udev info, or something).
Ugly hack for now.. certainly something more elaborate is possible.
multipath-tools:/debian/initramfs/local-top:
# Sync waiting for storage.
verbose && log_begin_msg "Waiting for scsi storage"
-{ rmmod scsi_wait_scan ; modprobe scsi_wait_scan ; rmmod
scsi_wait_scan ; } >/dev/null 2>&1
+# Ugly hack: sleep when scsi_wait_scan is not available (e.g., newer
kernels).
+{ rmmod scsi_wait_scan ; modprobe scsi_wait_scan || sleep 20; rmmod
scsi_wait_scan ; } >/dev/null 2>&1
verbose && log_end_msg
Testing on initramfs (break=top):
(initramfs) modprobe scsi_wait_scan
(initramfs) echo $?
1
(initramfs) sed 's:modprobe scsi_wait_scan:& || sleep 30:' -i
/scripts/local-top/multipath
(initramfs) exit
works fine (i.e., as intended :P).
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https://bugs.launchpad.net/bugs/1429327
Title:
ISST-LTE: system drops to initramfs after install on multipath disk
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