Edgar Fuß <ef%math.uni-bonn.de@localhost> writes: >> I seem to be facing two problems: >> >> 1. A certain svn update command is ridicously slow on my to-be file server. >> 2. During the svn update, the machine partially locks up and fails to >> respond >> to NFS requests. > Thanks to very kind help by hannken@, I now at least know what the problem is. > > Short form: WAPBL is currently completely unusable on RAIDframe (I always > suspected something like that), at least on non-Level 0 sets. > > The problem turned out to be wapbl_flush() writing non-fsbsize chunks on non- > fsbsize boundaries. So RAIDframe is nearly sure to RMW. > That makes the log being written to disc at about 1MB/s with the write lock > on the log being held. So everything else on that fs tstiles on the log's > read lock. Do you see this on RAID-1 too? I wonder if it's possible (easily) to make the log only use fsbize boundaries, (maybe forcing it to be bigger as a side effect.)
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