|
|
United States-English | |
|
|
 |
|
VERITAS File System 3.5 (HP OnlineJFS/JFS 3.5) Administrator's Guide: HP-UX 11i v2 > Chapter 1 The VERITAS File System
Enhanced I/O Performance |
|
|
VxFS provides enhanced I/O performance by applying an aggressive I/O clustering policy, integrating with VxVM, and allowing application specific parameters to be set on a per-file system basis. I/O clustering is a technique of grouping multiple I/O operations together for improved performance. VxFS I/O policies provide more aggressive clustering processes than other file systems and offer higher I/O throughput when using large files; the resulting performance is comparable to that provided by raw disk. VxFS interfaces with VxVM to determine the I/O characteristics of the underlying volume and perform I/O accordingly. VxFS also uses this information when using mkfs to perform proper allocation unit alignments for efficient I/O operations from the kernel. As part of VxFS/VxVM integration, VxVM exports a set of I/O parameters to achieve better I/O performance. This interface can enhance performance for different volume configurations such as RAID-5, striped, and mirrored volumes. Full stripe writes are important in a RAID-5 volume for strong I/O performance. VxFS uses these parameters to issue appropriate I/O requests to VxVM. You can also set application specific parameters on a per-file system basis to improve I/O performance.
For a discussion on VxVM integration and performance benefits, refer to Chapter 2 “VxFS Performance: Creating, Mounting, and Tuning File Systems”, Chapter 4 “Application Interface”, and the vxtunefs(1M) and tunefstab(1M) manual pages. |
||||||||||||||||||||||||||||||||||||||||||||||||||||||
 Printable version |
|
|
|
|
|
|||||||||||||||
|
|||||||||||||||
