Managing Shared Disks
Read this section for information on application programming performance
with Hashed Shared Disk and on how to use Hashed Shared Disks through C
The address of your I/O buffer must be aligned on a 4KB boundary. If
it is not, the Hashed Shared Disk read and write routines will not
parallelize I/O requests to underlying virtual shared disks.
Performance will be less than optimal.
Set the environment variable MALLOCTYPE to 3.4 to
make all new allocated buffers (MALLOC) at the page boundary.
The Hashed Shared Disk base code has a sample directory:
This directory contains the following files:
- When compiled, this file generates a binary that shows hashed shared disk
information for the hsd_name given from the command line.
- When compiled, this file generates a binary that lists information for all
configured hashed shared disks.
- The header file /usr/include/hsd_ioctl.h is installed with
the ssp.csd.hsd image. Structures defined in
hsd_ioctl.h may change from release to release. This
may require that you recompile your applications that utilize C interfaces to
the HSD to run on new releases. If you see IOCTL failures in your
application after migrating to a new release, try recompiling the
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