An increasing number of Red Hat/Fedora machines are dual architecture:they run both 64-bit and 32-bit x86 programs, and thus need to haveshared libraries and RPMs and so on for both of them. This canexpose some interesting issues when installing and upgrading RPMs;one of them is the dual architecture file ownership problem.

There are a lot of RPMs that install both architecture-dependent fileslike binaries and shared libraries and architecture-independent fileslike header files and manpages. The

Not all SAN RAID controllers support the idea of logical disks, whereyou can make a bunch of drives into a storage pool and then carve thestorage pool up into software-managed bits; some prefer the simplerand more straightforward approach of just exporting the pool itselfand staying out of the space management business.

Unfortunately, we need logical drives. The problem (and the reason) isthat logical drives are the only way to sensibly dynamically split thespace on a RAID controller between multiple fileservers. This is becauselogical

For those who haven't encountered it yet, RAID-6 is RAID-5 with twoparity blocks per stripe instead of one; it thus has a two disk overheadfor parity, compared to RAID-5's one disk.

We're interested in RAID-6 because it is more or less a better versionof RAID-5 plus a hot spare. With RAID-5, if you lose a drive the diskarray is non-redundant for the time it takes to rebuild onto your hot