[OSR-users] GFS Cluster Problem with "Out of Memory"

[Klaus S. <kla...@Ph...>]

Hello,

we got a trouble with our OSR Cluster (SL 5.3), sometimes a node runs 
unexpectedly out of memory and goes wild.

For example I just started a mkinitrd and during this process the node 
goes unresponsive. Looking at the console I saw many "Out of memory" 
messages and killing some processes.

Our current configuration:

Three nodes running SL 5.3

Each node's memory is limited to 2 GByte, due to the fact that we run 
XEN on top of it (we had bad experiences with ballooning dom0, so we 
limited the memory)

Normally the nodes need around 1 GByte:

[root@aule ~]# cat /proc/meminfo
MemTotal:      2097152 kB
MemFree:       1197244 kB
Buffers:          7408 kB
Cached:         335876 kB
SwapCached:          0 kB
Active:         127860 kB
Inactive:       308336 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:      2097152 kB
LowFree:       1197244 kB
SwapTotal:           0 kB
SwapFree:            0 kB
Dirty:             152 kB
Writeback:           0 kB
AnonPages:       92852 kB
Mapped:          22608 kB
Slab:            93820 kB
PageTables:       5256 kB
NFS_Unstable:        0 kB
Bounce:              0 kB
CommitLimit:   1048576 kB
Committed_AS:  1747212 kB
VmallocTotal: 34359738367 kB
VmallocUsed:      4828 kB
VmallocChunk: 34359733487 kB
[root@aule ~]#


What would be the best way to add SWAP to a node?
Or any other idea? Or hust extende the dom0 Memory?

Sincerly,
Klaus Steinberger