[Linux-cluster] clvmd without GFS?
Cahill, Ben M
ben.m.cahill at intel.com
Thu Oct 28 19:59:44 UTC 2004
> -----Original Message-----
> From: linux-cluster-bounces at redhat.com
> [mailto:linux-cluster-bounces at redhat.com] On Behalf Of Matt Mitchell
> Sent: Thursday, October 28, 2004 3:16 PM
> To: David Teigland
> Cc: linux-cluster at 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
>
> -m
>
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