7. Storage analysis and tuning
In this chapter we discuss how to monitor and tune disk I/O. The disk storage is a key component which determines the performance of several other subsystems.
The physical aspect (adapters, disks, etc.) is as critical in system performance as the device drivers, LVM and file system layers. Thus, we present performance monitoring at all levels together with some tuning techniques.
These commands are covered in this chapter:
For monitoring:
- iostat, filemon, fileplace, lslv, lspv, lsvg, lvmstat, sar -d
For tuning:
- lsdev, rmdev, mkdev, lscfg, lsattr, chdev, ioo, lvmo, vmo
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