http://www.pctechguide.com/glossary/disk-storage
1) Disk Overhead :
disk overhead - (computer science) the disk space required for information that is not data but is used for location and timing .
Disk drive overhead is not solely applied to RAID system (although this case, you have 50% overhead because of RAID 1 mirror). What about a single IDE drive, does it have hard drive overhead? The answer is "Yes". Disk drive overhead is some spaces in the hard drive has been utilized for system file (FAT, NTFS, FHS....) and RAID array (if you have RAID configured). Hard drive overhead cannot be reduced in single drive. However, in RAID (multiple drives) you can reduce the overhead (in each drive) by adding more drives in your array (the total overhead is unchanged but it spread out to multi drives so each drive has smaller overhead usage).
Command overhead refers to the processing time required by the controller, host adapter, or drive prior to the execution of a command. Lower command overhead yields higher drive performance. Disk overhead refers to the space required for non- data information such as location and timing. Disk overhead often accounts for about ten percent of drive capacity. Lower disk overhead yields greater disk capacity.
1) Disk Overhead :
disk overhead - (computer science) the disk space required for information that is not data but is used for location and timing .
Disk drive overhead is not solely applied to RAID system (although this case, you have 50% overhead because of RAID 1 mirror). What about a single IDE drive, does it have hard drive overhead? The answer is "Yes". Disk drive overhead is some spaces in the hard drive has been utilized for system file (FAT, NTFS, FHS....) and RAID array (if you have RAID configured). Hard drive overhead cannot be reduced in single drive. However, in RAID (multiple drives) you can reduce the overhead (in each drive) by adding more drives in your array (the total overhead is unchanged but it spread out to multi drives so each drive has smaller overhead usage).
Command overhead refers to the processing time required by the controller, host adapter, or drive prior to the execution of a command. Lower command overhead yields higher drive performance. Disk overhead refers to the space required for non- data information such as location and timing. Disk overhead often accounts for about ten percent of drive capacity. Lower disk overhead yields greater disk capacity.
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