On Wed, Jun 16, 2010 at 6:07 AM, Hartmut Reuter <[email protected]> wrote: ... >> > > Without --enable-fast-restart after a fileserver crash the salvager used to > salvage all volumes in all partitions before the start of the fileserver. > On large fileservers this could take hours and sometimes the salvager went out > of memory and crashed himself leaving still volumes not attachable. > > With the Demand Attach Fileserver (DAFS) this initial salvage is not necessary > any more, however, each volume which was not cleanly detached before gets > salvaged in the background. This is a nice feature which allows the most > demanded volumes to come up soonly, I hope, but still salvaging will take > hours > because it's the same amount of work that has to be done. >
Keep in mind that DAFS never brings volumes online unless requested by a client, so some volumes may never be attached; it also takes volumes offline after a period of unuse, so a DAFS server will only need to salvage the 'active' volumes after a crash. The combination of those two features greatly reduces the number of volumes to salvage, so it's not actually doing the same amount of salvaging (in the general case) as a traditional fileserver. Steven _______________________________________________ OpenAFS-info mailing list [email protected] https://lists.openafs.org/mailman/listinfo/openafs-info
