thanks all for your answers, i will try to be more specific and precise. I was
somehow hoping that the problem was common, and that a simple answer existed.
i tried the piece of script you provided :
perl -e 'for (my $i = 2; ; $i ++) { link "1", $i or die "Cant create ${i}th
link: $!\n"; }'
it returned, within 1-2 sec :
"Cant create 32001th link: Trop de liens"
So yes, notice that i translated the error msg, for communication and googling
purposes : "Trop de liens" is the actual message, and now i realize the
importance of that detail ...
I launched one BackupPC_dump this night, with the limit moved to 100000 : it
failed the same way, as expected.
[Question] How can i check that "the number of links on one or more pool files
exceeds
HardLinkMax", and figure out what is special/unique about such a file ?
[Question]
For your information, here are the last lines of the log generated by the
"backupPC_dump -v -f 192.168.2.105" command :
LOG
log ERROR: opendir
(/var/lib/backuppc/pc/192.168.2.105/27/f%2fmedia%2fRhenovia/fVBox_Data_until_January_2011/fSBML_221010_IP3R_ForArnaud/fsbml2java_distrib/fDATE27octobre2010TIME09h17_huge9/fSim9996-singleInput1193.777e-9.0-J0_k188586.679e-3.0-IP32.4244620171E7e-9.0)
failed
same 777 1000/1000 86
VBox_Data_until_January_2011/SBML_221010_IP3R_ForArnaud/sbml2java_distrib/DATE27octobre2010TIME09h17_huge9/Sim9996-singleInput1193.777e-9.0-J0_k188586.679e-3.0-IP32.4244620171E7e-9.0/Ca.txt
same 777 1000/1000 80
VBox_Data_until_January_2011/SBML_221010_IP3R_ForArnaud/sbml2java_distrib/DATE27octobre2010TIME09h17_huge9/Sim9996-singleInput1193.777e-9.0-J0_k188586.679e-3.0-IP32.4244620171E7e-9.0/IP3.txt
same 777 1000/1000 2317
VBox_Data_until_January_2011/SBML_221010_IP3R_ForArnaud/sbml2java_distrib/DATE27octobre2010TIME09h17_huge9/Sim9996-singleInput1193.777e-9.0-J0_k188586.679e-3.0-IP32.4244620171E7e-9.0/IP3R.txt
same 777 1000/1000 2909
VBox_Data_until_January_2011/SBML_221010_IP3R_ForArnaud/sbml2java_distrib/DATE27octobre2010TIME09h17_huge9/Sim9996-singleInput1193.777e-9.0-J0_k188586.679e-3.0-IP32.4244620171E7e-9.0/IP3R_Open.txt
same 777 1000/1000 2316
VBox_Data_until_January_2011/SBML_221010_IP3R_ForArnaud/sbml2java_distrib/DATE27octobre2010TIME09h17_huge9/Sim9996-singleInput1193.777e-9.0-J0_k188586.679e-3.0-IP32.4244620171E7e-9.0/StepSize.txt
create d 700 1000/1000 4096
VBox_Data_until_January_2011/SBML_221010_IP3R_ForArnaud/sbml2java_distrib/DATE27octobre2010TIME09h17_huge9/Sim9997-singleInput1193.777e-9.0-J0_k188586.679e-3.0-IP33.8881551803E7e-9.0
[Arrow] mkdir
/var/lib/backuppc/pc/192.168.2.105/new//f%2fmedia%2fRhenovia/fVBox_Data_until_January_2011/fSBML_221010_IP3R_ForArnaud/fsbml2java_distrib/fDATE27octobre2010TIME09h17_huge9/fSim9997-singleInput1193.777e-9.0-J0_k188586.679e-3.0-IP33.8881551803E7e-9.0:
Trop de liens at /usr/share/backuppc/lib/BackupPC/Xfer/RsyncFileIO.pm line 641
Parent read EOF from child: fatal error!
Done: 0 files, 0 bytes
[Arrow] Got fatal error during xfer (Child exited prematurely)
cmdSystemOrEval: about to system /bin/ping -c 1 192.168.2.105
cmdSystemOrEval: finished: got output PING 192.168.2.105 (192.168.2.105) 56(84)
bytes of data.
64 bytes from 192.168.2.105: icmp_seq=1 ttl=64 time=1.96 ms
--- 192.168.2.105 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 1.960/1.960/1.960/0.000 ms
cmdSystemOrEval: about to system /bin/ping -c 1 192.168.2.105
cmdSystemOrEval: finished: got output PING 192.168.2.105 (192.168.2.105) 56(84)
bytes of data.
64 bytes from 192.168.2.105: icmp_seq=1 ttl=64 time=1.23 ms
--- 192.168.2.105 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 1.238/1.238/1.238/0.000 ms
CheckHostAlive: returning 1.238
[Arrow] Backup aborted (Child exited prematurely)
Not saving this as a partial backup since it has fewer files than the prior one
(got 3 and 0 files versus 3)
dump failed: Child exited prematurely
ENDLOG
"Trop de liens at /usr/share/backuppc/lib/BackupPC/Xfer/RsyncFileIO.pm line
641" seems to be the most insightful message : would you tell me what this
RsyncFileIO.pm deals with ?
I also noticed a good clue, pointing out the number of subdirectories
hence, i have counted the number of subdirectories that are on the backuped
drive, using : "find . -type d | wc -l", that returned me :
82779
And, maybe more insightful, i have 32002 subdirectories in the same directory,
i.e. in the "most populated" one (the one on which the backup process fails :
/var/lib/backuppc/pc/192.168.2.105/new//f%2fmedia%2fRhenovia/fVBox_Data_until_January_2011/fSBML_221010_IP3R_ForArnaud/fsbml2java_distrib/fDATE27octobre2010TIME09h17_huge9)
I found out that, using ext3, a limit for the number of subdirectories in one
directory could be 31998
(http://superuser.com/questions/66331/what-is-the-maximum-number-of-folders-allowed-in-a-folder-in-linux).
I checked this with a shell script the following shell script :
SCRIPT
#!/bin/bash
for i in {1..32010}
do
mkdir test$i
done
END SCRIPT
It actually fails after 31998 created subdirectories on the ext3 partition
tested on the host's ntfs partition : the test is passed. I even tried with a
value of 500000 : I stopped it after 296000 subdirectories were created.
[Idea] So i consider the problem as identified : It is relatively not related
to backuppc itself, but deals with a sort of filesystems incompatibility. [Idea]
[Question] And finally, the only question that lasts is : how can i increase
the number of subdirectories tolerated by ext3 ? [Question]
Admit that it was quite tricky : eveything deals with a limit of 32000
(hardlinks, subdirectories ...) :o
Thanks again for your help, i hope there exists a workaround for that limit ...
!
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