[Pvfs2-users] storage pattern of PVFS2
rross at mcs.anl.gov
Wed Jan 16 15:54:24 EST 2008
the hostname of any server will do. -- rob
On Jan 16, 2008, at 2:39 AM, Wang Yu wrote:
> Well, I have another question.
> When we have several IO servers and want to mount pvfs2 in one
> client, in the command "mount -t pvfs2 tcp://testhost:3334/pvfs2-fs /
> mnt/pvfs2" what IO server's hostname should replace 'testhost'?
> Thanks a lot!
> On Jan 16, 2008 11:19 AM, Rob Ross <rross at mcs.anl.gov> wrote:
> the default is simple stripe, which does the traditional round-robin
> striping you're probably most familiar with. twod_stripe is a two-
> dimensional striping pattern used to combat incast.
> On Jan 15, 2008, at 8:58 PM, Wang Yu wrote:
> > Okay. Thanks!
> > Well, what is the difference among basic_dist, simple_stripe and
> > twod_stripe? and what is the default of pvfs2, is it
> > simple_stripe(stripe across all IO servers)?
> > Thanks!
> > On Jan 16, 2008 10:12 AM, Rob Ross <rross at mcs.anl.gov> wrote:
> > http://www.pvfs.org/doc/pvfs2-faq/
> > index.php#SECTION00075000000000000000
> > 6.5.2 Distribution parameters
> > Some distributions allow you to set parameters that impact how the
> > distribution behaves. These parameters can be set as follows:
> > prompt# setfattr -n "user.pvfs2.dist_params" -v "strip_size:4096" /
> > mnt/
> > pvfs2/directory
> > You can specify more than one "parameter:value" pair by seperating
> > them with commas.
> > 6.5.3 Number of datafiles
> > You can also specify the number of datafiles to stripe across:
> > prompt# setfattr -n "user.pvfs2.num_dfiles" -v "1" /mnt/pvfs2/
> > directory
> > PVFS defaults to striping files across each server in the file
> > However, you may find that for small files it is advantages to limit
> > each file to only a subset of servers (or even just one).
> > On Jan 15, 2008, at 8:01 PM, Wang Yu wrote:
> > > Hi, all
> > > Now I have three IO servers and one metadata server and multiple
> > > clients. When I write a file in one client, how can I control this
> > > file is stored into one IO server or all IO servers. Namely, how
> > > single and stripe storage pattern in pvfs2 work? and how to tune
> > > stripe size?
> > > Would you please tell me about the storage pattern of pvfs2? or
> > > documents will be appreciated!
> > > Thanks!
> > >
> > > --
> > > National Research Center for Intelligent Computing Systems
> > > Institute of Computing Technology, Chinese Academy of Sciences
> > > _______________________________________________
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> > > Pvfs2-users at beowulf-underground.org
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> > --
> > National Research Center for Intelligent Computing Systems
> > Institute of Computing Technology, Chinese Academy of Sciences
> National Research Center for Intelligent Computing Systems
> Institute of Computing Technology, Chinese Academy of Sciences
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