02-09-2017
With what you have told us, the application could be a huge bottleneck, the application server could be a huge bottleneck, the database server could be a huge bottleneck, the database application could be a huge bottleneck, or any combination of the above could be a bottleneck.
Running a filesystem backup while running applications that are using files on that filesystem is VERY likely to affect performance of those applications and of the backup software.
We have seen examples in this forum of text processing code that invokes several processes to produce output for each line read from a file containing a few thousand lines that literally ran for more than 10 hours. When that code was replaced by a single awk script with the output fed into sort, the script ran in less than 10 seconds and produced exactly the same output. Could your application code have a similar issues?
To figure out where you need to look, you first need to know what are your major stumbling blocks. Are you swapping processes in and out a lot? (Need more memory?) Are your disks thrashing? (Put files on different filesystems on different disks/controllers?) Are your CPUs running at 100%? (Badly written code or too many users on your system?) Is your network dropping packets? (Loose connections, faulty routes to servers, failing hardware, etc.?) ... ... ...
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LEARN ABOUT DEBIAN
imapproxyd
IMAPPROXYD(8) IMAP proxy daemon IMAPPROXYD(8)
NAME
imapproxyd - IMAP proxy daemon
SYNOPSIS
imapproxyd [ -f <config file name> ] [ -p <pidfile name> ]
DESCRIPTION
This manual page documents briefly the imapproxyd command. This manual page was written for the Debian distribution because the original
program does not have a manual page.
UP-ImapProxy proxies IMAP transactions between an IMAP client and an IMAP server. The general idea is that the client should never know
that it is not talking to the real IMAP server, but ImapProxy caches server connections.
ImapProxy was written to compensate for webmail clients that are unable to maintain persistent connections to an IMAP server. Most webmail
clients need to log in to an IMAP server for nearly every single transaction; This behaviour can cause tragic performance problems on the
IMAP server. ImapProxy tries to deal with this problem by leaving server connections open for a short time after a webmail client logs
out. When the webmail client connects again, ImapProxy will determine if there is a cached connection available and reuse it if possible.
FILES
By default, UP-ImapProxy reads /etc/imapproxy.conf on startup. This can be changed by using the -f option
Unless foreground_mode has been enabled, UP-ImapProxy will write its PID to to a PID-file. It defaults to /var/run/imapproxy.pid, but can
be overridden with the -p option
SEE ALSO
pimpstat(8),
AUTHOR
This manual page was written by Jose Luis Tallon <jltallon@adv-solutions.net>, for the Debian GNU/Linux system (but may be used by others).
Dave McMurtrie Mar 12, 2004 IMAPPROXYD(8)