Posts Tagged ‘full stripe’
In a previous blogpost I covered the general issue of misalignment on a disk segment level. This is the most occurring and the most obvious misalignment, where several spindles in a RAID set perform random I/O and misalignment causes more spindles need to seek for a single I/O than would be required when properly aligned.
Next in the series there is another misalignment issue which is rare, but can have a much bigger impact on tuned storage: Full stripe misalignment.
In this post: Throughput part 2: RAID types and segment sizes I wrote that a RAID5 setup can potentially perform better in a heavy-write environment over RAID10, if tunes right. While theoretically this might be true, I have some important addendum’s to this statement that vote against RAID5 which I’d like to share.