Bug#489850: multipath-tools-boot: fails to boot from a slow devices

[Janusz Dziemidowicz]

Package: multipath-tools-boot
Version: 0.4.8-10
Severity: critical
Justification: breaks the whole system

I've got a system with QLogic ISP2432 Fibre Channel card which I was
trying to boot from a multipathed /. Unfortunately multipath-tools-boot
was unable to boot the system, as it takes a while for the LUN to appear
on the system, so it is available only after /sbin/multipath was ran.
So there were no devices created in /dev/mapper/ and the system was unable
to boot, since it was set to use /dev/mapper.

I think, that /sbin/multipath shouldn't be ran only once during the system
start, but it should be triggered whenever a new device is discovered
(since initrd will wait for a root device to appear this would work nicely).
As a quick workaround I've added the following line:
echo 'ACTION=="add", SUBSYSTEM=="block", KERNEL=="sd[a-z]", RUN+="/sbin/multipath"' > $DESTDIR/etc/udev/rules.d/z60_multipath.rules
to /usr/share/initramfs-tools/hooks/multipath and I've rebuilt initramfs.
This fixes the problem for me.

-- Package-specific info:
Contents of /etc/multipath.conf:
defaults {
    udev_dir			/dev
    polling_interval		3
    selector			"round-robin 0"
    path_grouping_policy	failover
    getuid_callout		"/lib/udev/scsi_id -g -u -s /block/%n"
    path_checker		directio
    rr_min_io			100
    failback			immediate
    features			"1 queue_if_no_path"
}
blacklist {
    devnode	"^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
    devnode	"^hd[a-z][[0-9]*]"
    devnode	"^cciss"
}
devices {
    device {
	vendor	"3PARdata"
	product	"VV"
    }
}


-- System Information:
Debian Release: lenny/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.24-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=pl_PL.UTF-8, LC_CTYPE=pl_PL.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages multipath-tools-boot depends on:
ii  debconf [debconf-2.0]        1.5.20      Debian configuration management sy
ii  initramfs-tools              0.91e       tools for generating an initramfs
ii  multipath-tools              0.4.8-10    maintain multipath block device ac

multipath-tools-boot recommends no packages.

-- debconf information excluded