09-08-2011
Why mkfile decreases available memory?
Hi,
we are experiencing very odd behavior. After "mkfile 1g <somefile>" the available memory seen through vmstat memory free column decreases by the same ammount. It doesn't matter where the <somefile> is located, even when the file is on NAS, the available memory decreases. When the file is removed, the memory returns to its original. The mpstat shows another odd behaviour, one of the processors goes on 100% sys time usage. We can replicate this on several Solaris 10 SPARC machines but we cannot replicate it on Solaris 10 x86 machines. What's going on? The mkfile is used only to replicate the problem, we have found this problem during our regular backup procedure that almost nocks down Oracle server.
SunOS 5.10 SUNW,SPARC-Enterprise
32G RAM
Sparc Enterprice M4000 Server
Thanks, Jan
Last edited by jan_bar; 09-08-2011 at 09:20 AM..
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mkfile(1M) mkfile(1M)
NAME
mkfile - create a file
SYNOPSIS
mkfile [-nv] size [g | k | b | m] filename...
mkfile creates one or more files that are suitable for use as NFS-mounted swap areas, or as local swap areas. When a root user executes
mkfile(), the sticky bit is set and the file is padded with zeros by default. When non-root users execute mkfile(), they must manually
set the sticky bit using chmod(1). The default size is in bytes, but it can be flagged as gigabytes, kilobytes, blocks, or megabytes, with
the g, k, b, or m suffixes, respectively.
-n Create an empty filename. The size is noted, but disk blocks are not allocated until data is written to them. Files created with
this option cannot be swapped over local UFS mounts.
-v Verbose. Report the names and sizes of created files.
USAGE
See largefile(5) for the description of the behavior of mkfile when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
chmod(1), swap(1M), attributes(5), largefile(5)
2 Feb 2001 mkfile(1M)