Every Lustre file will use an inode on the MDS and at least one inode on an OST (more than one OST is the file stripe count is >1). If your OSTs don't have free inodes, Lustre cannot allocate an object for the file's contents.
The upper limit on the number of files will be the lesser of: 1) number of MDS inodes 2) sum of inodes across all OSTs But depending upon file size and stripe count, you could end up with less. -- Rick > On Nov 6, 2015, at 4:55 AM, Jérôme BECOT <[email protected]> wrote: > > Hi, > > We face a weird situation here. And i'd like to know if there is anything > wrong and what can I do to fix that. > > We have a 30TB system with lustre 2.6 (1 MDS / 2 OSS). The inode usage is > full though : > > root@SlurmMaster:~# df -i > Filesystem Inodes IUsed IFree IUse% Mounted on > /dev/sda5 0 0 0 - / > udev 8256017 390 8255627 1% /dev > tmpfs 8258094 347 8257747 1% /run > tmpfs 8258094 5 8258089 1% /run/lock > tmpfs 8258094 2 8258092 1% /run/shm > /dev/sdb1 0 0 0 - /home > 10.0.1.60@tcp:/lustre 37743327 37492361 250966 100% /scratch > cgroup 8258094 8 8258086 1% /sys/fs/cgroup > > root@SlurmMaster:~# lfs df -i > UUID Inodes IUsed IFree IUse% Mounted on > lustre-MDT0000_UUID 1169686528 37413529 1132272999 3% /scratch[MDT:0] > lustre-OST0000_UUID 17160192 16996738 163454 99% /scratch[OST:0] > lustre-OST0001_UUID 17160192 16996308 163884 99% /scratch[OST:1] > > filesystem summary: 37740867 37413529 327338 99% /scratch > > What is happening here ? I thought we would have a 4 billion files max, not > 16 million ? > > Thanks > > -- > Jérome BECOT > > Administrateur Systèmes et Réseaux > > Molécules à visée Thérapeutique par des approches in Silico (MTi) > Univ Paris Diderot, UMRS973 Inserm > Case 013 > Bât. Lamarck A, porte 412 > 35, rue Hélène Brion 75205 Paris Cedex 13 > France > > Tel : 01 57 27 83 82 > > _______________________________________________ > lustre-discuss mailing list > [email protected] > http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org _______________________________________________ lustre-discuss mailing list [email protected] http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
