On Thu, 9 Jan 2020 07:23:33 -0800 Lew Wolfgang <wolfgang@sweet-haven.com> wrote:
On 01/08/2020 10:34 PM, Per Jessen wrote:
Lew Wolfgang wrote:
Hi Folks,
Back in the old daze we used to allocate swap space three times as large as the installed RAM as a rule of thumb. But I've got two new servers with 512-GB of ECC RAM and now I'm wondering, How Much Swap?
The motherboard has two-each 1-TB NVMe M.2 PCIe modules, it's tempting to use one for the operating system and the second for swap. Data will be stored on hardware RAID6 arrays and so aren't a part of this calculation.
Any thoughts? 1-TB of swap on one M.2 for .5-TB of RAM? Much depends on your type of workload - anything thst size we only use for virtual hosting, so no swap. If you're not doing virtual hosting, I expect you know the workload really well, there are not many things that require that amount of memory.
My users process large datasets and visualize lots of it. They use python for much of the work, which tends to not use RAM efficiently. Their current machine has 128-GB of RAM, which is rather tight for them. Certainly they don't need 1-TB of swap, which probably wouldn't be effectively usable in the first place. But I vaguely recall that having too much swap was also bad, but that was a long time ago. Maybe I should just partition a smaller swap partition and save the extra space for a rainy day? But how small?
What's the availability requirement of the machine? Using the SSD as a RAID 1 for the OS etc might be useful? -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org