So, I have a Sun Blade 1500 (silver) running S10 u9 and everything else I have used (outside of SETI) has been fine.

I followed the direction from http://www.dotsch.de/boinc/BOINC%20Clients.html and it installs fine.

Now, when I fire it up, I get an odd error message about the data dir.

bash-3.00$ ./boinc_client
02-May-2011 16:41:25 [---] Starting BOINC client version 6.10.17 for sparc64-sun-solaris
02-May-2011 16:41:25 [---] log flags: file_xfer, sched_ops, task
02-May-2011 16:41:25 [---] Libraries: libcurl/7.18.0 zlib/1.2.3
02-May-2011 16:41:25 [---] Data directory: /opt/boinc
ioctl(SIOCGIFARP): Invalid argument
02-May-2011 16:41:25 [---] Processor: 1 SUNW,Sun-Blade-1500 sparcv9+vis2
02-May-2011 16:41:25 [---] Processor features:
02-May-2011 16:41:25 [---] OS: SunOS: 5.10
02-May-2011 16:41:25 [---] Memory: 3.00 GB physical, 2.00 GB virtual
02-May-2011 16:41:25 [---] Disk: 31.04 GB total, 23.32 GB free
02-May-2011 16:41:25 [---] Local time is UTC -6 hours
02-May-2011 16:41:25 [---] No usable GPUs found
02-May-2011 16:41:25 [---] Not using a proxy
02-May-2011 16:41:25 [SETI@home] URL http://setiathome.berkeley.edu/; Computer ID 5930082; resource share 100
02-May-2011 16:41:25 [---] No general preferences found - using BOINC defaults
02-May-2011 16:41:25 [---] Preferences limit memory usage when active to 1536.00MB
02-May-2011 16:41:25 [---] Preferences limit memory usage when idle to 2764.80MB
02-May-2011 16:41:25 [---] Preferences limit disk usage to 10.00GB
BOINC initialization completed, beginning process execution...
02-May-2011 16:41:25 [SETI@home] Restarting task 20no10ac.22281.640.10.10.39_1 using setiathome_enhanced version 512



Any help would be appreciated....

I am running OpenSolaris Express as a guest OS via VirtualBox on my Linux host. My Data directory is /home/tullio/opt/boinc. Maybe you don't have permission to use /opt/boinc.
Tullio

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The message "ioctl(SIOCGIFARP): Invalid argument" can been ignored. This happens sometimes on newer Solaris releases.

Btw. you are using the offical SETI application version 5.12. This version is still valid, but on my homepage(www.dotsch.de/seti) are newer SETI Enhanced and Astropulse application for a manual installation available.