How to check if server is NUMA enabled?

Opterons and Nelahem (55xx and later) Xeons have a NUMA architecture – each socket has its own memory bus and there is a link between the sockets. This link is called Hypertransport on Opteron systems and Quickpath on Xeons. The G5 predates Nelahem and still uses the older Front Side Bus, which is not a … Read more

HP ACU CLI Examples

My favorite example: This can be run from the shell or within the tool. hpacucli ctrl all show config (use hpacucli.exe for Windows) Or hpacucli ctrl all show config detail But, if you have the HP Management Agents installed anyway, you should have realtime monitoring of RAID status pushing back to email alerts or an … Read more

How can I determine the power demand of an HP server’s power supply under load?

Yes, you can run this server happily in under 2.5 Amps total… I can show you real-life utilization for that server platform/model. Watts = Amps x Volts Your power regulator and power supply efficiency mode settings will have an impact, but the example I give below is from one of my co-located ProLiant DL360 G7 … Read more

HP DL380p Gen8 (p420i controller) I/O oddity on XFS partitions

XFS and EL6 have fallen into an ugly state… I’ve abandoned XFS on EL6 systems for the time being due to several upstream features/changes slipping into the Red Hat kernel… This one was a surprise and caused some panic: Why are my XFS filesystems suddenly consuming more space and full of sparse files? Since November … Read more

How do servers with redundant power supplies balance consumption?

I’m going to give an HP Proliant-specific answer here, since the OP is asking about the HP product line. Let’s use the example of an HP DL360p Gen8 (also applies to G6, G7 and Gen9 servers): You have the option to configure the Redundant Power Supply Mode in the HP Rom-Based Setup Utility (press F9 … Read more