Hello, list,
I use 4 disk nodes (2TB RAID5 in each) with nbd.
The question is how can i configure the system, to use more cache (or
buffers) ?
All the nodes have 2GB ram, but never use more than 1.1GB.
[root@st-0001 root]# free
total used free shared buffers cached
Mem: 2072972 913048 1159924 0 838964 24568
-/+ buffers/cache: 49516 2023456
Swap: 0 0 0
[root@st-0001 root]# cat /proc/meminfo
MemTotal: 2072972 kB
MemFree: 1159052 kB
Buffers: 839772 kB
Cached: 25052 kB
SwapCached: 0 kB
Active: 10000 kB
Inactive: 857180 kB
HighTotal: 1179584 kB
HighFree: 1150596 kB
LowTotal: 893388 kB
LowFree: 8456 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 848 kB
Writeback: 0 kB
Mapped: 4884 kB
Slab: 27320 kB
CommitLimit: 1036484 kB
Committed_AS: 9460 kB
PageTables: 248 kB
VmallocTotal: 114680 kB
VmallocUsed: 452 kB
VmallocChunk: 113484 kB
[root@st-0001 root]#
The readahead and the performance is very important for me.
I have allready try to tune the vm, but the used cache/buffer is still
unchanged.
If somebody have an idea, please let me know! :-)
Thanks,
Janos
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