On Fri, 2006-04-28 at 20:49 +0100, Digby Tarvin wrote: > > > > > >P.S. to include something relevent to the original thread, I have > > >use both Reiserfs and Ext3, and have never found enough performance > > >or reliability difference to worry about - so for me the main > > >advantges of each are: > > > ext3 - more complere set of tools, such as dump/restore > > > > IMO, this is the single most important issue with any > > of these file systems. They are all good it seems. But the > > additional support varies widely. > > After my earlier comment above, I have just been bitten by a Reiserfs > bug which I think gives me an even better reason to lean towards ext3 > at the moment... > > I originally mis-reported this as a dump/restore problem, because I was > unable to restore successfully from archive files larger than 2GB, but > on further investigation today.... > > 1. scenario > digbyt@fujitsu# mount > ... > /dev/hda14 on /home type ext3 (rw) > /dev/hda13 on /usr/local type ext3 (rw) > /dev/sda2 on /mnt/sda2 type reiserfs (rw) > /dev/sda3 on /mnt/sda3 type ext3 (rw) > digbyt@fujitsu# ls -l ~digbyt/testfile > -rw-r--r-- 1 root root 2502686720 2006-04-28 17:03 /home/digbyt/testfile > > 2. copy big file to reiser filesystem on USB drive > > digbyt@fujitsu# dd if=~digbyt/testfile of=/mnt/sda2/testfile > 4888060+0 records in > 4888060+0 records out > digbyt@fujitsu# ls -l /mnt/sda2/testfile > -rw-r--r-- 1 root root 2502686720 2006-04-28 19:48 /mnt/sda2/testfile > > 3. all looks ok, copy from reiser back to ext3 partion on ide disk: > 2502686720 bytes (2.5 GB) copied, 219.419 seconds, 11.4 MB/s > digbyt@fujitsu# dd if=/mnt/sda2/testfile of=testfile > dd: reading `/mnt/sda2/testfile': Input/output error > 4194304+0 records in > 4194304+0 records out > 2147483648 bytes (2.1 GB) copied, 125.64 seconds, 17.1 MB/s > > 3. can't read back from reiser, try copying to an ext3 partition on USB: > digbyt@fujitsu# dd if=~digbyt/testfile of=/mnt/sda3/testfile > 4888060+0 records in > 4888060+0 records out > 2502686720 bytes (2.5 GB) copied, 225.598 seconds, 11.1 MB/s > > 4. Now retry copy from USB to IDE partitions > digbyt@fujitsu# dd if=/mnt/sda3/testfile of=testfile2 > 4888060+0 records in > 4888060+0 records out > 2502686720 bytes (2.5 GB) copied, 156.104 seconds, 16.0 MB/s > > 5. Conclusion - for some reason the reiser filesystem allows me to > write files longer than 2GB, but will not let me read back past > 2GB into the file: > > digbyt@fujitsu# ls -l > total 4545628 > -rw-r--r-- 1 root root 2147483648 2006-04-28 19:54 testfile > -rw-r--r-- 1 root root 2502686720 2006-04-28 20:08 testfile2 > digbyt@fujitsu# dc > 16o > 2147483648p > 80000000 > > This test was done on Debian Etch. The reiserfs on the USB drive was > formatted on another older system, and was reported as > reiserfs format "3.5" with standard journal > vs the "3.6" format created by current Debian tools, and the problem > does not seem to exist on the "3.6" format filesytems... Upgrade it. You can just use a remount with -oconvert on the filesystem. Then you should be able to read the file. I experienced this problem with a named pipe into a file. I didn't realize it until I had already deleted and wanted to extract back out. I was saved by the fact that it was fixed by doing the FS convert to 3.6 format. -- greg, greg@gregfolkert.net The technology that is Stronger, better, faster: Linux
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