Setting up SmartIO read caching for VxFS file systems

1. Create the VxFS cache area on the SSD device, using one of the following commands.

   • Specify one or more devices using the disk access name (daname) of the device. The device should be initialized for VxVM use and have the cdsdisk format.

     # sfcache create [-t VxFS] [size] daname[...] [--auto|--noauto] \
      [cachearea_name]

     Where:

     daname specifies the disk access name of the device on which to create the cache area.

     cachearea_name specifies a customized name for the cache area. If unspecified, the SmartIO feature automatically generates a name for the cache area.

     size specifies the size for the cache area. By default, the cache area uses all of the available space on the device.

     --noauto|--auto specifies the type of cache area. The default is --auto.

     For example:

     # sfcache create ssd0_0

   • Alternatively, you can specify the name of a disk group and a volume to use for the cache area. In this case, you cannot specify a size: the cache area uses the entire volume.

     # sfcache create [-t VxFS] [--noauto|--auto] dg/vol

     Where:

     dg/vol specifies the disk group name and volume name that you want to use for the cache area. SmartIO uses this name for the cache area.

     --noauto|--auto specifies the type of cache area. The default is --auto.

     For example:

     # sfcache create --auto ssd_dg/ssd_vol

2. If the file system is not already mounted, mount the VxFS file system.

   • If the cache area is auto, read caching is enabled when you mount the VxFS file system.

     For example:

     # mount -t vxfs /dev/vx/dsk/testdg/vol1 /mnt1

   • If the cache area is noauto, you must enable caching for each VxFS file system that you want to cache. To enable caching, mount the file system with the -o smartiomode option.

     For example:

     # mount -t vxfs -o smartiomode=read /dev/vx/dsk/testdg/vol1 /mnt1

     You can also enable caching after the file system is mounted.

     # sfcache enable mount_point

     Where:

     mount_point is the mount point for the file system.

     For example:

     # sfcache enable /mnt1

3. If required, you can further customize the caching behavior.

   See Customizing the caching behavior.