Hi, If I make a small update to a file, for example overwriting just the first byte, will DRBD send the full disk block that was modified, or does it just send the data for the actual write (1 byte)? Clearly the latter would be more efficient, but I'm not certain it is possible.
If it is the first option, is it sending a 1KB disk block, or is the block size determined by the file system-- 4KB in my case? I ask because I'm trying to estimate the bandwidth that will be required by an app when using drbd, and my plan had been simply use iostat to measure the average block writes/second and then multiply by the size of a block. thanks! Tim
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