Filter
Top Products
3.10.1.12.1. Disk Media Parameters
Table 7 contains attributes settings for the supported disk storage media types.
Table 6. Suggested Block Sizes for Disk
Disk Type Media Block Size Minimum
Access Size
Minimum Virtual
Volume Block Size
SCSI Attached 4 KB 0 1 MB
SSA Attached 4 KB 0 1 MB
Fibre Channel
Attached
4 KB 0 1 MB
In Table 7:
• Media Block Size is the block size to use in the Storage Class definition. For disk, this value
should also be used when configuring the Mover devices that correspond to this media type.
Note that this value will not limit the amount of data that can be read from or written to a disk
in one operation—it is used primarily to perform block boundary checking to ensure that all
device input/output requests are block aligned. This value should correspond to the physical
block size of the disk device.
• Minimum Access Size is the size of the smallest access request that should regularly be
satisfied by the media type. The performance of smaller accesses will be seriously degraded.
A value of zero indicates that the media is suitable for supporting all data accesses.
• Minimum Virtual Volume Block Size is the smallest block size that should be configured for
virtual volumes of the media type. Smaller values will cause increased overhead when
transferring to or from volumes configured with Stripe Widths greater than one. Virtual
Volume Block Size has little or no effect on virtual volumes whose Stripe Width is one.
Note: When SCSI, SSA or Fibre Channel attached disks are combined to form striped virtual
volumes, the minimum access size should become, at a minimum, the stripe width of the virtual
volume multiplied by the virtual volume block size. If not, data access will only use a subset of the
striped disks and therefore not take full advantage of the performance potential of the virtual volume.
3.10.1.12.2. Tape Media Parameters
The following table contains attributes settings for the supported tape storage media types.
HPSS Installation Guide July 2008
Release 6.2 (Revision 2.0) 107