One project refuse to send work due to low free disk space value. But looking at their disk space usage on other hosts it's obvious that there are plenty of disk space for that project available.
So is any way exist to override free disk space value reported in shedule request?

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Request less work, clean up your drive, or set the disk usage preferences more stringent.

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Yes, these options could help (not in this case though), thanks.
Initial work request is 1 sec so it's impossible to make it lower.
The change disk usage policy from 99% to 100% doesn't give required amount.

So the question remains: does BOINC provide some mechanism to manual override of free HDD space reported to project in schedule request?

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...
The change disk usage policy from 99% to 100% doesn't give required amount.
...

There are three options to adjust disk usage (four if you count swap space too). Here are mine:

Use at most 2 GB disk space 
Leave at least 0.05 GB disk space free 
Use at most 50% of total disk space 
Use at most 90% of page file (swap space)

What does BOINC tell about really being free? Here an excerpt from my Messages tab:

15-Jun-2008 17:45:33 [---] Disk: 29.98 GB total, [b]6.85 GB free[/b]
15-Jun-2008 17:45:33 [---] Preferences limit memory usage when active to 444.98MB
15-Jun-2008 17:45:33 [---] Preferences limit memory usage when idle to 444.98MB
15-Jun-2008 17:45:33 [---] [b]Preferences limit disk usage to 1.86GB[/b]

Gruß,
Gundolf

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Computer sind nicht alles im Leben. (Kleiner Scherz)

Well, in my case there is only ~300MB free space on partition.
Project under question uses ~20MB but requires ~600MB of free disk space.
So it just refuses to send any work. On another host with bigger free space it's happy with free space but it doesn't use it. So question is: can I manually resolve situation with incorrect needed free space estimation by project or it could be done only on server side?

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Yes, I'm sure.
It's A.I.S. and its project directory takes ~6MB (with ~10 WU loaded) and WU in processing takes another 1,5MB is slot directory.
And memory usage just tiny.

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How many days worth of work do you request?

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How many days worth of work do you request?

As I told before, I try to attach to project on new host, so 1 sec of work should be requested firstly. And 1 WU should arrive on that request. Not?

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Normally, yes. Am a bit pre-occupied with 3 other things (who says we men can't multitask? Pah!), so I missed your earlier post on that.

What are your settings for the disk usage options?
Are they set locally (through BOINC manager) or the web site?

Could you also post your start-up messages from BOINC Manager, please?

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Well, unfortunately full info is unavailable right now. Cause that host is in remote location and will be unreachable few days.
About preferences:
WEB preferences was used.
Here there are:

Disk and memory usage
Use at most 10 GB disk space
Leave at least
(Values smaller than 0.001 are ignored) 0.001 GB disk space free
Use at most 99% of total disk space
Write to disk at most every 180 seconds
Use at most 75% of page file (swap space)
Use at most
Enforced by version 5.8+ 50% of memory when computer is in use
Use at most
Enforced by version 5.8+ 90% of memory when computer is not in use
Network usage
Computer is connected to the Internet about every
(Leave blank or 0 if always connected.
BOINC will try to maintain at least this much work.) 3 days
Maintain enough work for an additional
Enforced by version 5.10+ 0.25 days

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There are messages:
23.06.08 8:33:50||Fetching configuration file from http://www.intelligencerealm.com/aisystem/get_project_config.php
23.06.08 8:34:12||Running CPU benchmarks
23.06.08 8:34:12||Suspending computation - running CPU benchmarks
23.06.08 8:34:20|Artificial Intelligence System|Master file download succeeded
23.06.08 8:34:26|Artificial Intelligence System|Sending scheduler request: Project initialization. Requesting 1 seconds of work, reporting 0 completed tasks
23.06.08 8:34:32|Artificial Intelligence System|Scheduler request succeeded: got 0 new tasks
23.06.08 8:34:32|Artificial Intelligence System|Message from server: No work sent
23.06.08 8:34:32|Artificial Intelligence System|Message from server: There was work but you don't have enough disk space allocated.
23.06.08 8:34:32|Artificial Intelligence System|Message from server: An additional 302 MB is needed.
23.06.08 8:34:32||General prefs: from http://setiathome.berkeley.edu/ (last modified 18-Feb-2008 20:38:44)
23.06.08 8:34:32||Host location: none
23.06.08 8:34:32||General prefs: using your defaults
23.06.08 8:34:32||Preferences limit memory usage when active to 47.75MB
23.06.08 8:34:32||Preferences limit memory usage when idle to 85.95MB
23.06.08 8:34:32||Preferences limit disk usage to 0.26GB
23.06.08 8:34:34|Artificial Intelligence System|Started download of stat_icon_01.png
23.06.08 8:34:34|Artificial Intelligence System|Started download of slideshow_aisystem_01_00.png
23.06.08 8:34:36|Artificial Intelligence System|Finished download of slideshow_aisystem_01_00.png
23.06.08 8:34:37|Artificial Intelligence System|Finished download of stat_icon_01.png

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Could you restart BOINC and then post the messages please?

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Could you restart BOINC and then post the messages please?

BOINC just started:

24.06.08 18:03:16||Starting BOINC client version 5.10.45 for windows_intelx86
24.06.08 18:03:16||log flags: task, file_xfer, sched_ops
24.06.08 18:03:16||Libraries: libcurl/7.18.0 OpenSSL/0.9.8e zlib/1.2.3
24.06.08 18:03:16||Data directory: C:\PROGRAM FILES\BOINC
24.06.08 18:03:16|SETI@home|Found app_info.xml; using anonymous platform
24.06.08 18:03:18||Processor: 1 GenuineIntel Pentium(r) Processor [Pentium(r) Processor]
24.06.08 18:03:18||Processor features: fpu mmx
24.06.08 18:03:18||OS: Microsoft Windows 98: SE, (04.10.2222.00)
24.06.08 18:03:18||Memory: 95.50 MB physical, 64.00 MB virtual
24.06.08 18:03:18||Disk: 935.00 MB total, 271.00 MB free
24.06.08 18:03:18||Local time is UTC +4 hours
24.06.08 18:03:18|Artificial Intelligence System|URL: http://www.intelligencerealm.com/aisystem/; Computer ID: 5636; location: (none); project prefs: default
24.06.08 18:03:18|SETI@home|URL: http://setiathome.berkeley.edu/; Computer ID: 4396800; location: school; project prefs: school
24.06.08 18:03:18||General prefs: from SETI@home (last modified 18-Feb-2008 20:38:44)
24.06.08 18:03:18||Host location: school
24.06.08 18:03:18||General prefs: using separate prefs for school
24.06.08 18:03:18||Preferences limit memory usage when active to 47.75MB
24.06.08 18:03:18||Preferences limit memory usage when idle to 85.95MB
24.06.08 18:03:18||Preferences limit disk usage to 0.26GB
24.06.08 18:03:19|SETI@home|Restarting task 06fe08aa.17959.24612.14.8.116_1 using setiathome_enhanced version 527
24.06.08 18:03:19|Artificial Intelligence System|Sending scheduler request: To fetch work. Requesting 197 seconds of work, reporting 0 completed tasks
24.06.08 18:03:25|Artificial Intelligence System|Scheduler request succeeded: got 0 new tasks
24.06.08 18:03:25|Artificial Intelligence System|Message from server: No work sent
24.06.08 18:03:25|Artificial Intelligence System|Message from server: There was work but you don't have enough disk space allocated.
24.06.08 18:03:25|Artificial Intelligence System|Message from server: An additional 207 MB is needed.

BOINC restarted again:
24.06.08 18:05:18||Starting BOINC client version 5.10.45 for windows_intelx86
24.06.08 18:05:18||log flags: task, file_xfer, sched_ops
24.06.08 18:05:18||Libraries: libcurl/7.18.0 OpenSSL/0.9.8e zlib/1.2.3
24.06.08 18:05:18||Data directory: C:\PROGRAM FILES\BOINC
24.06.08 18:05:18|SETI@home|Found app_info.xml; using anonymous platform
24.06.08 18:05:19||Processor: 1 GenuineIntel Pentium(r) Processor [Pentium(r) Processor]
24.06.08 18:05:19||Processor features: fpu mmx
24.06.08 18:05:19||OS: Microsoft Windows 98: SE, (04.10.2222.00)
24.06.08 18:05:19||Memory: 95.50 MB physical, 64.00 MB virtual
24.06.08 18:05:19||Disk: 935.00 MB total, 271.00 MB free
24.06.08 18:05:19||Local time is UTC +4 hours
24.06.08 18:05:19|Artificial Intelligence System|URL: http://www.intelligencerealm.com/aisystem/; Computer ID: 5636; location: (none); project prefs: default
24.06.08 18:05:19|SETI@home|URL: http://setiathome.berkeley.edu/; Computer ID: 4396800; location: school; project prefs: school
24.06.08 18:05:19||General prefs: from SETI@home (last modified 18-Feb-2008 20:38:44)
24.06.08 18:05:19||Host location: school
24.06.08 18:05:19||General prefs: using separate prefs for school
24.06.08 18:05:19||Preferences limit memory usage when active to 47.75MB
24.06.08 18:05:19||Preferences limit memory usage when idle to 85.95MB
24.06.08 18:05:19||Preferences limit disk usage to 0.26GB
24.06.08 18:05:20|SETI@home|Restarting task 06fe08aa.17959.24612.14.8.116_1 using setiathome_enhanced version 527

ADDON:
24.06.08 18:06:59|Artificial Intelligence System|Sending scheduler request: To fetch work. Requesting 197 seconds of work, reporting 0 completed tasks
24.06.08 18:07:04|Artificial Intelligence System|Scheduler request succeeded: got 0 new tasks
24.06.08 18:07:04|Artificial Intelligence System|Message from server: No work sent
24.06.08 18:07:04|Artificial Intelligence System|Message from server: There was work but you don't have enough disk space allocated.
24.06.08 18:07:04|Artificial Intelligence System|Message from server: An additional 207 MB is needed.
24.06.08 18:08:07|Artificial Intelligence System|Sending scheduler request: To fetch work. Requesting 197 seconds of work, reporting 0 completed tasks
24.06.08 18:08:12|Artificial Intelligence System|Scheduler request succeeded: got 0 new tasks
24.06.08 18:08:12|Artificial Intelligence System|Message from server: No work sent
24.06.08 18:08:12|Artificial Intelligence System|Message from server: There was work but you don't have enough disk space allocated.
24.06.08 18:08:12|Artificial Intelligence System|Message from server: An additional 207 MB is needed.

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The limit looks to be about 10% of your free space. So the most likely fix is to increase the percentage of your disk that you allow BOINC to use.

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BOINC WIKI

BOINCing since 2002/12/8

The limit looks to be about 10% of your free space. So the most likely fix is to increase the percentage of your disk that you allow BOINC to use.

I don't see 10%, for me 271 MB is almost equal to 0.26 GB :-)

24.06.08 18:03:18||Disk: 935.00 MB total, 271.00 MB free
...
24.06.08 18:03:18||Preferences limit disk usage to 0.26GB

@Raistmer: I never heard of an option to override the space request of an application. Perhaps somebody at Artificial Intelligence System can help you, if the demand is really that much overstated. Otherwise, your only option is to free another 207 MB on C: or to reinstall BOINC on another drive with more space, if available. When you, after uninstalling, copy the BOINC directory to the new location and install into that copy, you won't lose any work or preferences.

Gruß,
Gundolf

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Computer sind nicht alles im Leben. (Kleiner Scherz)

@Raistmer: I never heard of an option to override the space request of an application. Perhaps somebody at Artificial Intelligence System can help you, if the demand is really that much overstated.
Gruß,
Gundolf

Thanks. They placed such high space requirements in anticipation of new app version. So these low HDD space hosts will continue with SETI.

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@Raistmer: I never heard of an option to override the space request of an application. Perhaps somebody at Artificial Intelligence System can help you, if the demand is really that much overstated.
Gruß,
Gundolf

Thanks. They placed such high space requirements in anticipation of new app version. So these low HDD space hosts will continue with SETI.

It is quite possible to have different disk space requirements for each different kind of task.

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BOINC WIKI