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Full Discussion: Re-start of RHEL server
Operating Systems Linux Red Hat Re-start of RHEL server Post 302779293 by lupin..the..3rd on Tuesday 12th of March 2013 12:45:26 PM
Old 03-12-2013
There are two kinds of "cache" that can and will consume all your free memory - and it's a good thing.

The first is I/O buffers. This is a cache for moving data around. If you're moving 100 GB from one physical disk to another, that data is going through this I/O buffer space. It allows for more efficient multitasking. The read disk fills the buffer, and the write disk gets its data from the buffer. It's an efficient way of doing things.

The second is file cache. This is a filesystem read cache. Frequently accessed files are stored in this read cache to make accessing them quicker.

Both are tuned and managed automatically by the kernel. There is no user intervention required. There is no need to reboot to "clear" them. If you start up a new program that requires a lot of memory, the kernel will prune the I/O buffer and the file cache automatically to make room for your new program.

You can completely ignore I/O buffer and file cache for memory usage purposes. Count only the system + user space. Take your "used" total, and subtract file cache and buffer space, and the resulting number should = system + user.
 

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dbc_max_pct(5)							     OBSOLETED							    dbc_max_pct(5)

NAME
dbc_max_pct, dbc_min_pct, bufcache_max_pct, bufpages, nbuf - OBSOLETED kernel tunable parameter DESCRIPTION
These tunables have been obsoleted and removed. Do not make any changes to these tunables, as they have no effect on the kernel. Use the file cache tunables and (see filecache_max(5)). In previous releases, the tunables and were used to set limits to the dynamic buffer cache, and the tunables and were used for tuning the buffer cache when a static cache was desired. This release of HP-UX offers improved file caching technology and improved physical memory control associated to caching file I/O data. The number of tunable parameters used to control file caching memory usage is reduced from five to two, and previous usability issues are addressed. Restrictions on Changing These tunables should not be modified. Attempting to tune any of the obsolete buffer cache tunables, or results in an error. Use the tunables and to set limits on the file cache. Note that, on a any given system, the optimum values of these two new tunables are not necessarily equivalent to the optimum values of the obsolete buffer cache tunable values in the older systems. You should first deter- mine if the new default values yield acceptable performance on your system, before attempting to change the values of the new file cache tunables. AUTHOR
and were developed by HP. SEE ALSO
filecache_max(5). Kernel Tunable Parameter dbc_max_pct(5)
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