[Pvfs2-users] starting order of servers

[Phil Carns]

I just tried to replicate your iozone problem but I did not have any 
luck.  Could you list your exact iozone command line arguments?

I assume it is something like this:

	cd /mnt/pvfs2
	iozone -i 0 -i 1 -t 16

Regarding your distribution question, the "basic_dist" distribution 
explicitly uses only one datafile/server.  If you want to stripe data 
across all of your servers, then you need to use the default 
distribution.  It is called "simple_stripe", though there isn't normally 
any need to specify it explicitly.

-Phil

Wang Yu wrote:
>  Hi, Rob
>  When I test IO performance of pvfs2 using iozone(first with '-i 0' 
> option and then with '-i 1' option), the thread number of iozone is 16. 
> In this situation, I find that the file generated by iozone can not be 
> deleted by iozone, and iozone can not go through now. Have you come 
> across this problem? When the thread number is 1, 4, 8, there is no 
> problem! How about 32, 64 threads?
> Another question, I use setfattr to set "basic_dist" to a directory 
> /mnt/pvfs2/single. When I use iozone in /mnt/pvfs2/single with the '-t 
> 16' option, the 16 sub-files are stored into only one IO server. Should 
> pvfs2 distribute all the 16 sub-files to all the IO servers to achieve 
> high balance and performance? How to tune some parameters?
> Thanks!
> Regards!
> 
> On Jan 22, 2008 4:16 AM, Rob Ross <rross at mcs.anl.gov 
> <mailto:rross at mcs.anl.gov>> wrote:
> 
>     Hi,
> 
>     The order of starting the servers doesn't really matter. You should
>     only have one line in /etc/pvfs2tab on each client. The hostname can
>     be any of X, Y, Z, or M.
> 
>     Rob
> 
>     On Jan 20, 2008, at 8:49 AM, Wang Yu wrote:
> 
>      > Hi,all
>      > Now I have 3 IO servers(X, Y, and Z) and 1 Metadata server(M).  And
>      > I have 4 clients.
>      > When I run pvfs2-server on these servers, what is the starting order
>      > of them(X, Y, Z, M)?
>      > When I configure the file /etc/pvfs2tab in each client, what the
>      > 'testhost' should be(X, Y or Z)? Should I have three lines in this
>      > file for X, Y and Z?
>      >
>      > Thanks!
>      > --
>      > National Research Center for Intelligent Computing Systems
>      > Institute of Computing Technology, Chinese Academy of Sciences
>      > _______________________________________________
>      > Pvfs2-users mailing list
>      > Pvfs2-users at beowulf-underground.org
>     <mailto:Pvfs2-users at beowulf-underground.org>
>      > http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users
> 
> 
> 
> 
> -- 
> National Research Center for Intelligent Computing Systems
> Institute of Computing Technology, Chinese Academy of Sciences
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Pvfs2-users mailing list
> Pvfs2-users at beowulf-underground.org
> http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users