Best Practices To Be Followed While Working With PMv6

1. If using Windows as your operating system, use NTFS File System. FAT32 has a limit of maximum number (16,000) of files you can store in a folder. For archive accounts this limit is easily reached. This can cause issues during local delivery. NTFS has a absurdly large limit so practically there is no limit.
   
2. Reboot your PostMaster machine every two to three days depending on the load (mails per day). This will ensure that system resources allocated to Java are freed and made available again.
   
3. Run Scandisk (Windows) or Badblocks (Linux) at least once a week. This will give you early warning regarding bad sectors which could cause potential read-write errors.
   
4. Ensure sufficient Hard Disk Space is available on the drive where IQv6 is installed. The free space should be 200 MB to 2 GB plus space required for the mails to be stored. This is obviously dependent on the number of users you have and the amount of mailbox quota you have allocated to each user.
   
5. The free space on C Drive (Windows) or / (Linux) should also be more the Windows System Paging File (Windows) or System Swap File size (Linux). If free space is less than the size of Windows System Paging File (Windows) or System Swap File size (Linux), there will be a lot of file / disk swapping leading to high CPU Usage.
   
6. For installation with up to 25 users 128 MB of RAM is mandatory. For installations with 50 users and above, minimum memory requirement for PMv6 is 512 MB.
   
7. PMv6 uses internally uses a database called HSQL. The database server and IQuinox share the same Java environment. In this case, allocate JAVA as much as memory as possible (at least up to 75% of system memory) . e.g. if system memory = 256 MB, in the xp.bat set -Xms192m -Xmx192m in the java command.
   
8. Back up the folder ...\qlc\xpv6\conf folder everyday to a different machine. This ensure that in case of HDD crash, you can start PMv6 with very minimum downtime and without having to configure all user / other data. In this case, you will still loose the mails though.