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Linux on System z Disk I/O Performance (Webcast)
- Live Virtual Class abstract
- The session is covering the latest performance results and tuning tips for Linux on System z. It includes tuning and setup recommendations for disk I/O, focusing on a comparison of ECKD versus SCSI disks, considerations concerning storage servers and Linux disk I/O options.
- Replay
- Creation date
- July 2010
High performance FICON
- Presentation abstract
-
- Prerequisites to enable High Performance FICON (HPF) with Linux on System z
- Performance expectation
- Performance results and comparison of channel programs with chained 4KB data, channel programs with full track data and HPF
- View
- Creation date
- July 2010
ECKD versus SCSI
- Presentation abstract
-
- Linux kernel components involved in disk I/O: block device layer and device drivers
- Example for storage server attachment
- I/O processing differences between ECKD and SCSI
- Sample scenarios for ECKD, including single disk, Parallel Access Volumes (PAV) , striped logical volume and storage pool striped volume
- Sample scenarios for SCSI, including single disk, multipathing, striped logical volume and storage pool striped volume
- View
- Creation date
- July 2010
DASD block size
- Presentation abstract
- The DASD block size recommendation is 4096 bytes. The presentation shows that throughput and capacity is lower with smaller block sizes.
- View
- Creation date
- June 2010
Linux disk I/O considerations
- Presentation abstract
-
- Recommendation for using journaling file systems
- How to deal with temporary files
- Direct I/O
- Async I/O
- Function and recommendation for I/O schedulers
- Linear and striped logical volumes
- Effect of read ahead settings
- Monitoring disk I/O with iostat
- View
- Creation date
- June 2010
Disk performance optimizing
- Presentation abstract
-
- Storage server internals that need to be considered
- Strategy for better use of ranks, device adapters, host bus adapters and channel paths
- Disk placement
- View
- Creation date
- June 2010
Storage pool striping
- Presentation abstract
- This presentation explains storage pool striping, shows its impact on performance, and compares the performance of storage pool striped volumes with logical volumes.
- View
- Creation date
- March 2009
