[Lustre-discuss] Frequent OSS Crashes with heavy load

Brian J. Murrell Brian.Murrell at Sun.COM
Mon Nov 10 08:21:30 PST 2008


On Mon, 2008-11-10 at 16:18 +0000, Wang lu wrote:
> I am also unclear about the top result:
> top - 00:16:19 up 1 day,  3:58,  1 user,  load average: 22.71, 23.27, 23.74
> Tasks: 851 total,   2 running, 849 sleeping,   0 stopped,   0 zombie
> Cpu(s):  0.0% us,  7.0% sy,  0.0% ni, 86.7% id,  0.2% wa,  0.2% hi,  5.9% si
> Mem:   8307364k total,   894940k used,  7412424k free,   240912k buffers
> Swap: 16386292k total,        0k used, 16386292k free,    78108k cached
> 
> 
> The CPU and memory are both free, while the load average is quite high. It is
> possibile for Lustre to cache more data?

Caching on the OSS is a coming feature but that doesn't alleviate the
need of the OST to read data not in cache and data that needs to be
flushed to disk.  IOW, a cache will not alleviate a problem of
oversubscribed storage.

b.

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