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/etc/shadow files stores actual password in encrypted format for user’s account. How do I check users password expiry information under Linux operating systems?
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How do I find out that how many files are open and how many allowed in Linux server operating systems?
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Maximum Number of Disks In RAID 5

Is there a limit to how many drives you can have in one RAID-5? What is the maximum number of physical drives recommended in a RAID-5 set?
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I'm getting an error which read as follows under FreeBSD 7.2 server and Squid stable caching server:

WARNING! Your cache is running out of filedescriptors

How do I fix this problem and increase the number of system-wide available filedescriptors for FreeBSD server?
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Proftpd: Make Sure FTP Client Does Not Timeout

Q. I'm using ProFTPD FTP server under CentOS Linux. How do I make sure that my FTP client does not disconnect or timeout connection to FTP server?
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I've Squid Proxy server with over 100 Windows workstation. I see following error message in my cache.log file:

WARNING! Your cache is running out of filedescriptors

Do I need to filter proxy server requests to avoid this problem? How do I fix this problem under CentOS / Fedora / RHEL / Debian Linux?
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How do I increase the maximum number of open files under CentOS Linux? How do I open more file descriptors under Linux?
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