On Oct 31, 2005 09:01 +0000, Alex Bligh wrote: > I am trying to get a 9550SX to support a 1.5TB raid partition. I am unsure > whether this is a driver problem, or an ext3 problem (as am getting some > other wierdness detecting LUNs), but... > > fdisk recognizes the disk OK. I make a single extended partition with a > single 1.5TB logical partition inside it. I then run > > mke2fs -j /dev/sdb > > It gets to writing inode tables, and wants to write 11176 block groups. > It gets to 3600 (odd) of 11176 block groups fine, then slows to a complete > crawl (2 secs per write), though strace shows it is fine. > > My suspicious mind says this is 1/3 of the way through the disk, which is > 2^31 blocks, i.e. where the block number goes negative in a signed > environment. > > Is there a problem with ext3 supporting more than 2^31 blocks? We have customers using partitions close to 2TB, with 2.4.21 RHEL3, 2.6.5 SLES9, 2.6.9 RHEL4. It is concievable that your SCSI card/driver is not doing proper cache after 1TB or somehow starting to do strange things with the PCI bus after that point. Try doing something like: dd if=/dev/zero of=/dev/sdb bs=1M & sleep 1; while killall -USR1 dd; sleep 1; done and then plot the dd progress vs time to see if the rate is dramatically different over time. Cheers, Andreas -- Andreas Dilger Principal Software Engineer Cluster File Systems, Inc. _______________________________________________ Ext3-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ext3-users
