… really have misaligned IO because HDDs operate in 512-byte sectors and that’s also the smallest amount of disk IO that systems… xfs training slides: D stands for the disk here so the RAID has 4 bearing disks (spindles) and if there’s a misalignment on the file system, you can see how RAID ends up doing 5 IO…
Post: Is disk Everything for MySQL Performance ?
April 25, 2008 By 7 Comments
… ask how many disks they have instead of how many systems they have” on MySQL UC2008 Scalability Panel ? Indeed disks MAY be the… not always the case. Another mistake is to measure IO capacity in spindles – So your hard drive can do 200 random reads… fixed amount of disk at your disposal and if you have BBU most likely data files is where all IO will go…
