I have a vmware vm with CentOS 6.5 fully updated acting as a nfs server.<br />
It uses an iscsi lun mounted as ext4 filesystem (previously it was a xfs but I've re-created it as ext4 on the test-case machine).<br />
When I'm hardly writing from a client to the nfs share it start using memory until it crashes with oom-killer and no-memory.<br />
The machine has 4GB of memory<br />
Just before the last crash top shows:<br />
top - 13:24:12 up 4:30, 4 users, load average: 9.56, 9.59, 9.15<br />
Tasks: 142 total, 1 running, 141 sleeping, 0 stopped, 0 zombie<br />
Cpu(s): 2.1%us, 22.9%sy, 0.0%ni, 1.3%id, 67.0%wa, 0.4%hi, 6.2%si, 0.0%st<br />
Mem: 3924680k total, 3835528k used, 89152k free, 740k buffers<br />
Swap: 3670008k total, 17428k used, 3652580k free, 32644k cached<br />
<br />
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND <br />
16616 root 20 0 15032 896 608 S 0.6 0.0 0:00.02 top <br />
16643 root 20 0 98.5m 596 516 S 0.0 0.0 0:00.00 sleep <br />
2115 root 20 0 105m 540 392 S 0.6 0.0 0:01.46 OSWatcherFM.sh <br />
11498 root 20 0 15028 516 264 R 0.3 0.0 0:04.92 top <br />
16610 root 20 0 6128 248 196 S 0.0 0.0 0:00.00 vmstat <br />
2003 root 20 0 106m 28 28 S 2.3 0.0 0:05.90 OSWatcher.sh <br />
1 root 20 0 19232 4 4 S 0.0 0.0 0:01.18 init <br />
309 postfix 20 0 81364 4 4 S 0.0 0.0 0:00.03 pickup <br />
1531 root 16 -4 27640 4 4 S 0.0 0.0 0:00.02 auditd <br />
1547 root 20 0 249m 4 4 S 0.0 0.0 0:00.09 rsyslogd <br />
1587 rpc 20 0 18976 4 4 S 0.0 0.0 0:00.09 rpcbind <br />
1608 rpcuser 20 0 23348 4 4 S 0.0 0.0 0:00.00 rpc.statd <br />
1630 dbus 20 0 31776 4 4 S 0.0 0.0 0:00.03 dbus-daemon <br />
1713 root 20 0 23908 4 4 S 0.0 0.0 0:00.04 rpc.mountd <br />
1749 root 20 0 25164 4 4 S 0.0 0.0 0:00.00 rpc.idmapd <br />
1885 ntp 20 0 30720 4 4 S 0.0 0.0 0:00.07 ntpd <br />
1964 root 20 0 81284 4 4 S 0.0 0.0 0:00.11 master <br />
<br />
Slabtop showed:<br />
Active / Total Objects (% used) : 28487557 / 28512985 (99.9%)<br />
Active / Total Slabs (% used) : 930675 / 930699 (100.0%)<br />
Active / Total Caches (% used) : 111 / 204 (54.4%)<br />
Active / Total Size (% used) : 3491198.21K / 3495332.56K (99.9%)<br />
Minimum / Average / Maximum Object : 0.01K / 0.12K / 4096.00K<br />
<br />
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME <br />
27478920 27478920 100% 0.12K 915964 30 3663856K size-128<br />
551232 551051 99% 0.02K 3828 144 15312K avtab_node<br />
357504 356906 99% 0.03K 3192 112 12768K size-32<br />
20768 15609 75% 0.06K 352 59 1408K size-64<br />
12339 12328 99% 0.14K 457 27 1828K sysfs_dir_cache<br />
10706 7602 71% 0.07K 202 53 808K selinux_inode_security<br />
10040 7462 74% 0.19K 502 20 2008K dentry<br />
9962 8154 81% 0.11K 293 34 1172K nfsd_drc<br />
6120 6120 100% 0.19K 306 20 1224K size-192
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