Getting to know Dell PowerFlex v3.6.x

NOTE:For certain system configurations, the SDS needs to be configured to be able to use more than one Non-Uniform Memory Access (NUMA) domain. The SDS is configured by default to have affinity to socket 0 in a server or VM, and therefore, by default, the SDS is connected only to NUMA 0, and only has access to the memory in NUMA 0. If NUMA 0 (usually half the total memory) is less than the memory required by the SDS, you need to allow the SDS access to the memory in the other NUMA. For more information, see the explanation and configuration procedures for "Configure the SDS for optimal memory usage" in "Post-deployment tasks" in the Deploy Dell PowerFlex .

NOTE:PowerFlex does not support using swap on Storage only and SVM nodes. From version 3.0 and above, this should be the default setting.

Using swap with PowerFlex has the following impact:

• Slows the performance of the system
• Impacts I/O on the system disks which is used for swap. This may cause other functions that use the system disk to have slow I/Os such as:
  1. MDM repository related operations
  2. PowerFlex logs written to disk.
     Disable swap and set vm.overcommit to the following on nodes that have MDM and SDS process on them in the in/etc/sysctl.conf file:

     vm.overcommit_memory=2

     vm.overcommit_ratio=100