On Mon, Jan 26, 2015 at 07:14:43PM +0300, Alexander Tsvetkov wrote: > Hello, > > I'm trying to understand the expected behaviour of "maxpct" option > in case of small xfs filesystem > comparing the maximum percentage defined for this option with the > percentage of actually allocated > inodes in filesystem, but the result of prepared test case doesn't > correspond to the expectations: > > [root@fedora ~]#mkfs.xfs -f -d size=16m -i maxpct=1 /dev/sdb2 On 3.19-rc5, immediately after mount: # df -i /mnt/scratch Filesystem Inodes IUsed IFree IUse% Mounted on /dev/ram1 640 3 637 1% /mnt/scratch Which indicates that imaxpct=1 is being calculated correctly, before we even look at whether it is being enforced correctly or not. So, what kernel version? http://xfs.org/index.php/XFS_FAQ#Q:_What_information_should_I_include_when_reporting_a_problem.3F > [root@fedora ~]# for i in {0..100000}; do str=$(mktemp > --tmpdir=/mnt/scratch tmp.XXXXXXXXXX); echo $str; done Which is a complex (and very slow!) way of doing: # for i in {0..100000}; do echo > /mnt/scratch/$i ; done 2> /dev/null > filesystem is full with created files: > > [root@fedora ~]# df -Th | grep scratch > /dev/sdb2 xfs 13M 13M 148K 99% /mnt/scratch # df -Th /mnt/scratch Filesystem Type Size Used Avail Use% Mounted on /dev/ram1 xfs 13M 1.1M 12M 9% /mnt/scratch # df -i /mnt/scratch Filesystem Inodes IUsed IFree IUse% Mounted on /dev/ram1 640 640 0 100% /mnt/scratch > and from the number of actually created inodes: > > [root@fedora ~]# xfs_db -c "blockget -n" -c "ncheck" /dev/sdb2 | wc -l > 40512 That's a directory structure entry count, equivalent to 'find /mnt/scratch | wc -l', not an allocated inode count which is what 'df -i' reports. Even so, on 3.19-rc5: # xfs_db -c "blockget -n" -c "ncheck" /dev/ram1 | wc -l 637 which matches what 'df -i' tells us about allocated inodes and hence imaxpct is working as expected. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
