Ask HN: book recommendations for linux server admin?

I'm an experienced developer, but have never done any significant server administration. I can use vi and navigate the filesystem, but that is about it.

We are moving our low latency trading application from Windows to linux. I'm not becoming a server admin, but we're a small company, and I'll likely be managing the performance lab machines.

I'm looking for book recommendations given the following: + We're going to use RH or SUSE (not yet decided) + We may end up running a realtime version: RH/MRG or SLERT + We have ~50 servers + We're interesting in tuning network performance to improve latency and may want to adjust process priorities. + We won't be running a window manager + Our servers are not connected to the internet: we aren't handling email or web traffic

Thanks!