Posts Tagged ‘full stripe’
Under the covers with Miss Alignment: Full-stripe writes
May 2nd, 2011 | 
Author: 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.
Posted in Storage, VMware | 
Tags: full stripe, mis-alignment, misalignment, RAID10, RAID3, RAID5, write-optimized, writes | 
4 Comments »
RAID5 write performance – Revisited
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.
Posted in VMware |
Tags: full stripe, full stripe write, impact, performance, RAID, RAID 5, RAID5, read modify write, rebuild, RMW, VMware, write penalty, write performance |
14 Comments »
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