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IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning
book

IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning

by Cathy Warrick, Craig Gordon, Benoit Granier, Keitaro Imai, Rosemary McCutchen, Brannen Proctor, Jim Sedgwick, Paulus Usong, Mary Ann Vandermark, John Wickes
December 2005
Intermediate to advanced content levelIntermediate to advanced
530 pages
18h 34m
English
IBM Redbooks
Content preview from IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning
Chapter 7. Open systems servers - UNIX 257
vx_fancyra_enabled Enable or disable VXFS file system read-ahead
HFS read-ahead options
The kernel options for enabling read-ahead for HFS file systems are the following:
hfs_max_ra_blocks The maximum number of read-ahead blocks that the kernel may
have outstanding for a single HFS file system.
hfs_max_revra_blocks The maximum number of reverse read-ahead blocks that the kernel
may have outstanding for a single HFS file system.
hfs_ra_per_disk The amount of HFS file system read-ahead per disk drive, in KB.
hp_hfs_mtra_enabled Enable or disable HFS multi-threaded read-ahead. No manpage.
Dynamic buffer cache ...
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ISBN: 0738494119Purchase book