Re: [OpenAFS] Re: bos blockscanner
When OpenAFS started in 2000 I pushed a lot of extensions into it to make it easier to maintain MR-AFS. I think at that time we already were the last site to use it. The next years the source code of MR-AFS could be reduced to the very specific parts on the server side while with these extensions for all other subdirectories simply the openafs code could be used. The scanner was a stand alone program which traversed the volume metadata to find out which files needed to get a copy elsewhere and which files were eligible for wiping (removing from disk). In extreme situations it could be helpful to stop the scanner... There are many other remains of MR-AFS in different source files of openafs which savely could be removed now that MR-AFS is out of service since five years. MR-AFS was shutdown finally in 2008. Since than we are running AFS/OSD which has a all the features MR-AFS had and some more. I am working on the project to bring the AFS/OSD change into the official openafs source code. -Hartmut Andrew Deason wrote: On Fri, 25 Jan 2013 19:50:41 +0100 (CET) Thorsten Alteholz open...@alteholz.de wrote: the command 'bos help' says something about 'blockscanner' and 'unblockscanner'. This shall start something like '/usr/afs/bin/scanner -block'. But I did not find anything about such scanner. Can anybody please shed some light on this? Is this a new fearture for the future? No, it is very old. I believe that is there to accommodate installations with MR-AFS. MR-AFS is for using AFS with HSM systems but is not freely available or open source or anything; you can google around for what little information exists about it. I'm not sure if it's still in use. Those rpcs hard code the commands they run, ugh... I don't have any familiarity with it, but from what I've seen in the OpenAFS source, I think the 'scanner' process is something that shuffled data between disk and tape. Normally it runs continuously or something, but those commands allow you to temporarily disable or enable migrations. -- - Hartmut Reuter e-mail reu...@rzg.mpg.de phone+49-89-3299-1328 fax +49-89-3299-1301 RZG (Rechenzentrum Garching)webhttp://www.rzg.mpg.de/~hwr Computing Center of the Max-Planck-Gesellschaft (MPG) and the Institut fuer Plasmaphysik (IPP) - ___ OpenAFS-info mailing list OpenAFS-info@openafs.org https://lists.openafs.org/mailman/listinfo/openafs-info
Re: [OpenAFS] Re: bos blockscanner
On 01/26/2013 04:50 AM, Hartmut Reuter wrote: When OpenAFS started in 2000 I pushed a lot of extensions into it to make it easier to maintain MR-AFS. I think at that time we already were the last site to use it. The next years the source code of MR-AFS could be reduced to the very specific parts on the server side while with these extensions for all other subdirectories simply the openafs code could be used. The scanner was a stand alone program which traversed the volume metadata to find out which files needed to get a copy elsewhere and which files were eligible for wiping (removing from disk). In extreme situations it could be helpful to stop the scanner... There are many other remains of MR-AFS in different source files of openafs which savely could be removed now that MR-AFS is out of service since five years. MR-AFS was shutdown finally in 2008. Since than we are running AFS/OSD which has a all the features MR-AFS had and some more. I am working on the project to bring the AFS/OSD change into the official openafs source code. -Hartmut Andrew Deason wrote: On Fri, 25 Jan 2013 19:50:41 +0100 (CET) Thorsten Alteholz open...@alteholz.de wrote: the command 'bos help' says something about 'blockscanner' and 'unblockscanner'. This shall start something like '/usr/afs/bin/scanner -block'. But I did not find anything about such scanner. Can anybody please shed some light on this? Is this a new fearture for the future? No, it is very old. I believe that is there to accommodate installations with MR-AFS. MR-AFS is for using AFS with HSM systems but is not freely available or open source or anything; you can google around for what little information exists about it. I'm not sure if it's still in use. Those rpcs hard code the commands they run, ugh... I don't have any familiarity with it, but from what I've seen in the OpenAFS source, I think the 'scanner' process is something that shuffled data between disk and tape. Normally it runs continuously or something, but those commands allow you to temporarily disable or enable migrations. Should the blockscanner feature be removed? ___ OpenAFS-info mailing list OpenAFS-info@openafs.org https://lists.openafs.org/mailman/listinfo/openafs-info
Re: [OpenAFS] Re: bos blockscanner
On 01/26/2013 12:06 PM, Hartmut Reuter wrote: Jason Edgecombe wrote: On 01/26/2013 04:50 AM, Hartmut Reuter wrote: When OpenAFS started in 2000 I pushed a lot of extensions into it to make it easier to maintain MR-AFS. I think at that time we already were the last site to use it. The next years the source code of MR-AFS could be reduced to the very specific parts on the server side while with these extensions for all other subdirectories simply the openafs code could be used. The scanner was a stand alone program which traversed the volume metadata to find out which files needed to get a copy elsewhere and which files were eligible for wiping (removing from disk). In extreme situations it could be helpful to stop the scanner... There are many other remains of MR-AFS in different source files of openafs which savely could be removed now that MR-AFS is out of service since five years. MR-AFS was shutdown finally in 2008. Since than we are running AFS/OSD which has a all the features MR-AFS had and some more. I am working on the project to bring the AFS/OSD change into the official openafs source code. -Hartmut Andrew Deason wrote: On Fri, 25 Jan 2013 19:50:41 +0100 (CET) Thorsten Alteholz open...@alteholz.de wrote: the command 'bos help' says something about 'blockscanner' and 'unblockscanner'. This shall start something like '/usr/afs/bin/scanner -block'. But I did not find anything about such scanner. Can anybody please shed some light on this? Is this a new fearture for the future? No, it is very old. I believe that is there to accommodate installations with MR-AFS. MR-AFS is for using AFS with HSM systems but is not freely available or open source or anything; you can google around for what little information exists about it. I'm not sure if it's still in use. Those rpcs hard code the commands they run, ugh... I don't have any familiarity with it, but from what I've seen in the OpenAFS source, I think the 'scanner' process is something that shuffled data between disk and tape. Normally it runs continuously or something, but those commands allow you to temporarily disable or enable migrations. Should the blockscanner feature be removed? Yes and much more: the type fs allows to run the scanner and bos salvage has many options which are only mr-afs specific... Hartmut OK, what does the rest of the list think? Jason ___ OpenAFS-info mailing list OpenAFS-info@openafs.org https://lists.openafs.org/mailman/listinfo/openafs-info
