Partition Advice

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I’m setting up a new mail server (dovecot + sendmail + SpamAssassin +
ClamAV + MIMEDefang) to replace an aging CentOS 6 box. The new box is a low-end PowerEdge with an SSD, 3 4TB red drives on a PERC RAID controller which I’ll probably set up RAID5, and possibly mirrored internal SD cards as a boot device. I’m debating how to partition it and am soliciting advice.

My initial instinct is to put /boot and the OS on the SSD and the home directories with their mail store on the RAID array. I might put a rescue partition on the internal SD drive (which is normally intended for a VM
host). Does anyone see anything wrong with that? Should I do something different? Anything I should avoid putting on the SSD, such as swap, /tmp, and /var/tmp?

I’ve been running Red Hat as a small office server since 5.2 back in the
90’s. I’m trying to create a system that’s easy to fix when it breaks. I
find that’s the real power of Linux over any other OS: It’s easy to fix when it breaks.

Oh, and backup will be to an external USB drive using BackupPC, with the drive regularly swapped off-site, plus an off-site rsync mirror.

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