> I would suspect the Lustre client side caching influencing your write
> performance. 10GB is not adequate, try atleast 4x of the RAM size for
> file-sizes.
> HTH,
> -Kums
Kums, thanks for the suggestion. I have 4G of RAM on my client and 4G
of RAM on my server. I typically create 20G files,
Hi Roger,
This sounds terribly familiar. The likely cause can be found by
reading through the following thread:
http://lists.lustre.org/pipermail/lustre-discuss/2008-March/007024.html
Note that running dumpe2fs on each device, as suggested by one of the
messages in the thread, did *not* res
riday, May 30, 2008 3:07 PM
To: Lundgren, Andrew
Cc: Roger Spellman; lustre-discuss@lists.lustre.org
Subject: RE: [Lustre-discuss] Performance Drop creating big files
I meant use file-size that are 4x the RAM size :-). So if
your RAM size
is 4GB, use atleast 16GB file-sizes for the benchmarks.
O
I get it.
Thanks!
> -Original Message-
> From: Kumaran Rajaram [mailto:[EMAIL PROTECTED]
> Sent: Friday, May 30, 2008 3:07 PM
> To: Lundgren, Andrew
> Cc: Roger Spellman; lustre-discuss@lists.lustre.org
> Subject: RE: [Lustre-discuss] Performance Drop creating big files
o: Roger Spellman
> > Cc: lustre-discuss@lists.lustre.org
> > Subject: Re: [Lustre-discuss] Performance Drop creating big files
> >
> > Roger,
> >
> > I would suspect the Lustre client side caching influencing your write
> > performance. 10GB is not adequate, try
Friday, May 30, 2008 3:01 PM
> To: Roger Spellman
> Cc: lustre-discuss@lists.lustre.org
> Subject: Re: [Lustre-discuss] Performance Drop creating big files
>
> Roger,
>
> I would suspect the Lustre client side caching influencing your write
> performance. 10GB is not adequ
Roger,
I would suspect the Lustre client side caching influencing your write
performance. 10GB is not adequate, try atleast 4x of the RAM size for
file-sizes. Try doing the same tests with O_DIRECT flag as it'd truly
measure your disk I/O performance bypassing FS + buffer cache.
HTH,
-Kums
On Fr
I am seeing the following odd behavior. I have several OSSes, each with
a 7T RAID 5.
If I use a single client to create a single 1T file which is striped to
a single OST, the performance starts off at about 400 MB/s (which is
typical for my HW), then gradually decreases, until it reaches 250
