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RE: [Linux-cluster] clvmd without GFS?



 

> -----Original Message-----
> From: linux-cluster-bounces redhat com 
> [mailto:linux-cluster-bounces redhat com] On Behalf Of Matt Mitchell
> Sent: Thursday, October 28, 2004 3:16 PM
> To: David Teigland
> Cc: linux-cluster redhat com
> Subject: Re: [Linux-cluster] clvmd without GFS?
> 

> 7) Ugh.  OK, let's try it on the other node:
> 
> greenville:/mnt/xs_media# time sh -c 'ls 
> 100032/mls/fmls_stills | wc -l'
> 298407
> 
> real    77m38.569s
> user    0m8.850s
> sys     0m35.006s
> 
> 
> Both systems are sitting there idle now.  What did I do by 
> unmounting and remounting the GFS partition?
> 
> For the record that is just over 12GB of data in those 298407 files. 
> Partition is 3% full (as reported by df).
> 
> Help...?

I'd be curious to know if it makes a difference if you mount using -o
noatime option (see man mount)?  The default access-time update
threshold for GFS is 3600 seconds (1 hour).  This can cause a bunch of
write transactions to happen, even if you're just doing a read operation
such as ls.  Since your exercise is taking over an hour, this might be
thrashing the atime updates, but I don't know how much that might be
adding.

-- Ben --

Opinions are mine, not Intel's


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