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User Guide for Cisco Digital Media Manager 5.2.x
OL-15762-03
Chapter 19 Content Distribution and Delivery
Reference
Is the ACNS channel quota misconfigured?
Consider the following points when you configure the channel quota for DMS in CDM.
• On each Content Engine, the total disk space for the channel must not exceed the CDNFS
disk space allocation.
• The combined size of all content files in a channel must not exceed the amount of disk
space that you allocated for the channel in the Channel Quota field at Contents >
Channels > Definition.
Worksheet
Due to overhead, a file uses more disk space than its own size. You can anticipate how
much space to reserve for a file.
1. What is the actual file size in kilobytes (KB)?
File size in KB =
2. Divide the file size in KB by the file system’s fixed block size in bytes—a 4096-byte unit.
File size in KB / 4096 =
3. Round up the quotient to the nearest integer. The result counts exactly how many 4 KB
blocks the file has filled—or partially filled.
Used file system blocks =
4. Multiply the total number of used file system blocks by 4096 bytes. The result measures
actual disk space consumption in bytes.
Total disk usage in bytes =
Note 4096 bytes x 4 = 16384.
The integer 4 represents disk space that is reserved for internal system usage.
5. Add 16384 to the total disk space consumption in bytes.
Minimum disk space to reserve =
Tip We recommend that you reserve 10 percent more space than you estimate the file will consume. This
cushion ensures that space remains available to other internal system functions.