Ok thanks Phil and Rob! ________________________________________ From: Ross, Robert B. Sent: Wednesday, June 03, 2015 11:47 AM To: Carns, Philip H. Cc: Dorier, Matthieu; [email protected] Subject: Re: [Pvfs2-users] Changing distribution/layout using PVFS API
Also, it's possible that a zero size strip will blow something up -- not sure that has been tested :). -- Rob On Jun 3, 2015, at 11:36 AM, Phil Carns <[email protected]> wrote: > Well, the tricky thing is that the varstrip configuration parameters actually > reference each strip by a data object index (i.e. the 0th, 1st, 2nd... > datafile) relative to that particular file. Each file in turn will have a > different permutation of which datafile maps to which server for load > balancing reasons. So the 0th strip on one file might point to hostA and the > 0th strip on another file might point to hostB. > > As a result, the varstrip distribution by itself still won't let you restrict > a file to a specific set of servers. You would still need a layout. > > In general, the breakdown of responsibility is that the layout controls the > selection of servers, but then the distribution controls the organization of > data within that set. > > -Phil > > > On 06/03/2015 12:20 PM, Dorier, Matthieu wrote: >> Or can I use a varstrip_dist distribution on a directory and set the strip >> sizes to 0 for servers I don't want to use? >> Matthieu >> >> ________________________________________ >> From: Dorier, Matthieu >> Sent: Wednesday, June 03, 2015 11:18 AM >> To: Phil Carns; [email protected] >> Subject: RE: [Pvfs2-users] Changing distribution/layout using PVFS API >> >> Good to know. So there is no way to associate a particular directory to a >> particular set of servers, correct? >> Matthieu >> ________________________________________ >> From: [email protected] >> [[email protected]] on behalf of Phil Carns >> [[email protected]] >> Sent: Wednesday, June 03, 2015 11:06 AM >> To: [email protected] >> Subject: Re: [Pvfs2-users] Changing distribution/layout using PVFS API >> >> Just a heads up on something to look out for: if I recall correctly you >> can set the distribution and its parameters on a directory (and it will >> then apply to newly created files in that directory), but the same might >> not be true of layouts. You might have to specify the layouts >> explicitly at create time rather than inheriting them from directory hints. >> >> -Phil >> >> On 06/03/2015 11:56 AM, Dorier, Matthieu wrote: >>> It does help, thanks! >>> Matthieu >>> >>> ________________________________________ >>> From: Elaine Quarles [[email protected]] >>> Sent: Wednesday, June 03, 2015 10:36 AM >>> To: Dorier, Matthieu >>> Cc: [email protected] >>> Subject: Re: [Pvfs2-users] Changing distribution/layout using PVFS API >>> >>> Matthieu, >>> >>> You can look in the source tree at src/apps/admin/pvfs2-xattr.c for an >>> example of using the PVFS_sys_seteattr function call to set >>> attributes. >>> >>> Hope that helps! >>> Elaine >>> >>> On Wed, Jun 3, 2015 at 10:56 AM, Dorier, Matthieu <[email protected]> wrote: >>>> Hi, >>>> >>>> I'm reading this page: >>>> http://www.orangefs.org/trac/orangefs/wiki/Distributions >>>> Could you give me an example of how to change the layout of an existing >>>> directory using PVFS_SYS_LAYOUT_LIST and the PVFS API (instead of >>>> setfattr)? >>>> Thanks, >>>> >>>> Matthieu >>>> >>>> ________________________________ >>>> Matthieu Dorier, PhD >>>> Postdoctoral Appointee >>>> Argonne National Laboratory, MCS >>>> 9700 S Cass Ave, Lemont, IL 60439 >>>> +1 630 252 1515 >>>> >>>> _______________________________________________ >>>> Pvfs2-users mailing list >>>> [email protected] >>>> http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users >>>> >>> _______________________________________________ >>> Pvfs2-users mailing list >>> [email protected] >>> http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users >> _______________________________________________ >> Pvfs2-users mailing list >> [email protected] >> http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users > > _______________________________________________ > Pvfs2-users mailing list > [email protected] > http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users _______________________________________________ Pvfs2-users mailing list [email protected] http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users
