Intel 1520 manual Storage, Freshness

Storage

The following table describes the storage options.

Option	Description
Maximum	Specifies the maximum size of HTTP or FTP objects the
HTTP/FTP	appliance can cache.
object size in	Use a 0 (zero) to indicate no limit.
bytes
Maximum	Specifies the maximum number of HTTP alternates that the
number of	appliance can cache.
alternate	Use a 0 (zero) to indicate no limit. If a popular URL has
versions
	thousands of alternates, you might observe increased cache
(HTTP)
	hit latencies (transaction times) as the appliance searches
	through the alternates for each request. In particular, some
	URL addresses can have large numbers of alternates due to
	cookies. If the appliance is set to vary on cookies, you might
	encounter this problem. See Variable content‚ on page 38 for
	more information.

Freshness

The following table describes the freshness options.

Option	Description
Verify	Configures the appliance to ask the original content server to
freshness	verify the freshness of objects according to the following list
by checking	before serving them.
	❚ when the object has expired
	❚ when the object has expired or if the object has no
	expiration date
	❚ always
	❚ never
Minimum	Specifies the minimum freshness information required to
freshness	consider a document able to be cached:
information for	❚ an explicit lifetime
a document to	❚ a last-modified time
be cached	❚ nothing
If an object	Specifies the time limits the appliance will keep an object in
has no	the cache:
expiration	❚ minimum time in the cache. You can specify from
date
	15 minutes to two weeks.
	❚ maximum time in the cache. You can specify from
	15 minutes to two weeks.

36Intel NetStructure Cache Appliance Administrator’s Guide