LightRoom 1.2 Auto XMP Excessive Disk I/O

I've turned on auto xmp and let Lightroom run overnight against 14K+ photos with fresh keywords. In the morning I found the disk activity had ceased so I thought the catalog had finally synch'd with the files.
I was surprised to see that each time I start Lightroom it begins the disk I/O again for extended periods (>2Hrs) and makes the loading of images very slow once again. Both cores are loaded at ~50% most of the time.
What triggers the Lightroom disk I/O activity? Is it possible to get all the disk I/O out of the way and finally get to a fully synch'd state by browsing the images in some way to ensure that all the triggers are queued?
If I had to let the machine work uninterrupted for a couple of days that wouldn't be a problem as long as I knew an end was in sight.
Core2Duo 2.4G, 2G ram, 500G local drive, WinXPhome with all patches. Nothing but Lightroom running. Optimize and relauch didn't help.
The only thing that seems to work is turning off Auto XMP but that seems counter productive.
Any ideas?
jim

Just do 'S' then Cmd/Ctl-A then Cmd/Ctl-S to save Metadata, then 'S' to close stacks!
Four button pushings and you're done!
Oy!
Don
Don Ricklin, MacBook 2Ghz Duo 2 Core running 10.4.10 & Win XP, Pentax *ist D
See LR Links list at my
Blog for related sites.

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[SOLVED] Long time with excessive disk access before system reboot.

I feel I would be grateful for some help here. It's my first go at Arch Linux having used Xubuntu for several years. It may be I'm missing something obvious but then I would be happy if someone could point me in the right direction.
Problem: When I do a system restart by issuing
$ systemctl reboot
I get the following output
Sending SIGTERM to remaining processes...
Sending SIGKILL to remaining processes...
Unmounting file systems.
Unmounted /sys/kernel/debug.
Unmounted /dev/hugepages.
Unmounted /dev/mqueue.
Not all file systems unmounted, 1 left.
Disabling swaps.
Detaching loop devices.
Detaching DM devices.
Unmounting file systems.
Not all file systems unmounted, 1 left.
Cannot finalize remaining filesystems and devices, giving up.
Successfully changed into root pivot.
Unmounting all devices.
Detaching loop devices.
Diassembling stacked devices.
mdadm: stopped /dev/md126
[ 1654.867177] Restarting system.
However, after the last line is printed, the system does not reboot immediately but hangs for about 2 minutes with heavy disk activity. I can't say if it is read or write or both, but the led of my HDD is lit constantly. When this activity stops, the machine reboots.
$ systemctl poweroff
works as expected, i.e. shuts down immediately without excessive disk access.
I see this behaviour both with the installed Arch system and when I run the live installation/recovery CD. It is also the same if I boot into the busybox rescue shell and then restarts the machine from there. It also does not seem to matter if any partition on the disk is is mounted or not, the behaviour is always the same with 2 min. heavy activity before reboot.
System setup:
Sony Vaio VPZ13. Intel Core i5 M460, 4GB ram, 2x64GB SSD in RAID0 configuration via bios setting (a.k.a. fake raid), partitioned like:
windows boot
windows system
linux swap
linux "/"
linux "/home"
So it's a dual boot setup with Windows 7.
The raid array is assembled by mdadm, and I have mdadm_udev among my mkinitcpio.conf hooks (after blocks but before filesystems).
Snip from journalctl log showing actions when reboot has been issued:
jan 18 12:24:23 wione systemd[1]: Stopping Sound Card.
jan 18 12:24:23 wione systemd[1]: Stopped target Sound Card.
jan 18 12:24:23 wione systemd[1]: Stopping Bluetooth.
jan 18 12:24:23 wione systemd[1]: Stopped target Bluetooth.
jan 18 12:24:23 wione systemd[1]: Stopping Graphical Interface.
jan 18 12:24:23 wione systemd[1]: Stopped target Graphical Interface.
jan 18 12:24:23 wione systemd[1]: Stopping Multi-User.
jan 18 12:24:23 wione systemd[1]: Stopped target Multi-User.
jan 18 12:24:23 wione systemd[1]: Stopping Login Prompts.
jan 18 12:24:23 wione systemd[1]: Stopped target Login Prompts.
jan 18 12:24:23 wione systemd[1]: Stopping Getty on tty1...
jan 18 12:24:23 wione systemd[1]: Stopping Login Service...
jan 18 12:24:23 wione login[333]: pam_unix(login:session): session closed for user root
jan 18 12:24:23 wione login[333]: pam_systemd(login:session): Failed to connect to system bus: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
jan 18 12:24:23 wione systemd[1]: Stopped D-Bus System Message Bus.
jan 18 12:24:23 wione systemd[1]: Stopped Getty on tty1.
jan 18 12:24:23 wione systemd[1]: Stopping Permit User Sessions...
jan 18 12:24:23 wione systemd[1]: Stopped Permit User Sessions.
jan 18 12:24:23 wione systemd[1]: Stopped Login Service.
jan 18 12:24:23 wione systemd[1]: Stopping Basic System.
jan 18 12:24:23 wione systemd[1]: Stopped target Basic System.
jan 18 12:24:23 wione systemd[1]: Stopping Dispatch Password Requests to Console Directory Watch.
jan 18 12:24:23 wione systemd[1]: Stopped Dispatch Password Requests to Console Directory Watch.
jan 18 12:24:23 wione systemd[1]: Stopping Daily Cleanup of Temporary Directories.
jan 18 12:24:23 wione systemd[1]: Stopped Daily Cleanup of Temporary Directories.
jan 18 12:24:23 wione systemd[1]: Stopping Sockets.
jan 18 12:24:23 wione systemd[1]: Stopped target Sockets.
jan 18 12:24:23 wione systemd[1]: Stopping D-Bus System Message Bus Socket.
jan 18 12:24:23 wione systemd[1]: Closed D-Bus System Message Bus Socket.
jan 18 12:24:23 wione systemd[1]: Stopping System Initialization.
jan 18 12:24:23 wione systemd[1]: Stopped Setup Virtual Console.
jan 18 12:24:23 wione systemd[1]: Unmounting Temporary Directory...
jan 18 12:24:23 wione systemd[1]: Unmounted Temporary Directory.
jan 18 12:24:23 wione systemd[1]: Unmounted /home.
jan 18 12:24:23 wione systemd[1]: Starting Unmount All Filesystems.
jan 18 12:24:23 wione systemd[1]: Reached target Unmount All Filesystems.
jan 18 12:24:23 wione systemd[1]: Stopping Local File Systems (Pre).
jan 18 12:24:23 wione systemd[1]: Stopped target Local File Systems (Pre).
jan 18 12:24:23 wione systemd[1]: Stopping Remount Root and Kernel File Systems...
jan 18 12:24:23 wione systemd[1]: Stopped Remount Root and Kernel File Systems.
jan 18 12:24:23 wione systemd[1]: Starting Shutdown.
jan 18 12:24:23 wione systemd[1]: Reached target Shutdown.
jan 18 12:24:23 wione systemd[1]: Starting Save Random Seed...
jan 18 12:24:23 wione systemd[1]: Starting Update UTMP about System Shutdown...
jan 18 12:24:23 wione systemd[1]: Started Save Random Seed.
jan 18 12:24:23 wione systemd[1]: Started Update UTMP about System Shutdown.
jan 18 12:24:23 wione systemd[1]: Starting Final Step.
jan 18 12:24:23 wione systemd[1]: Reached target Final Step.
jan 18 12:24:23 wione systemd[1]: Starting Reboot...
jan 18 12:24:23 wione systemd[1]: Shutting down.
jan 18 12:24:23 wione systemd-journal[189]: Journal stopped
-- Reboot --
Since I have used Xubuntu without hassle for several years, I first thought the problem may be related to systemd reboot and something in my system setup. But I have tried the Fedora 17 live CD and rebooting there works as expected. So, since it works in one systemd distro, it should work with Arch as well.
Then I thought that it maybe had something to do with the raid-array, something along the lines of
https://bugzilla.redhat.com/show_bug.cgi?id=752593
https://bugzilla.redhat.com/show_bug.cgi?id=879327
But then I found the shutdown hook for mkinitcpio and now I see that the array is stopped and dissassembled. So thats not the problem either. (Or thats what I guess at least.)
Unfortunately I'm out of ideas. Any help would be grateful.
Last edited by wingbrant (2013-02-02 22:20:20)

It turned out that the magic word for me was "reboot=pci" on the kernel command line. With that option set it works lika a charm The machine reboots nice and clean.

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LightRoom 1.2 Auto XMP Excessive Disk I/O

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