Hi, all: I have two questions about MDLog: 1. The max number of logsegments per MDlog (mds_log_max_segments) is configured to be 30 in the config_opts.h file. However, the MDLog doesn’t check the number of logsegments when it start a new segment. The configuration is only used when the number of segments in a MDLog is larger than 2*mds_log_max_segments. The MDS notifies monitor, while the monitor does nothing. My question is: Is the logsegments size limited to a max size? If so, what’s the size? 2. The MDLog prezeros two periods ahead of the write_pos of Journaler. The comment of _issue_prezero function is “we need to zero at least two periods, minimum, to ensure that we have a full empty object/period in front of us”. Does it means that the OSD will preallocate objects for the Journaler ? The function is actually implemented by Objecter::remove. However, the Objecter::remove only removes a object through FileStore/NewStore. It seams that the OSD doesn’t preallocate objects. If so, then what’s the purpose of prezero? Or, do I misunderstand anything? Thanks. Best regard, Fei Xia _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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