On Mon, Oct 22, 2007 at 06:26:56PM -0700, Blake Golliher wrote:
I'd argue that this is general file system issue, not so much a wafl issue. I don't think wafl is particularly slow at this workload
The problem itself is a general filesystem issue I agree.
However, my understanding is that wafl stores the metadata with the file, I assume as the first block. UFS stores the metadata in inodes, and they are not stored with the file, but the system tries to keep inodes "close" to the file. Inodes reside together with other inodes so a single read can pick up a lot of inodes.
So to me it seems possible thatUFS may have an advantage when accessing metadata because the number of individual block reads (and hence seeks etc) could be a lot less.
Obviously statistics come into play a lot here. Thats why I am talking in generalities.
If anything I say above is incorrect, please correct me. I am not a FS developer.
Regards, pdg
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