During the course of [[ https://phabricator.wikimedia.org/T178177 | investigating unusually high latencies with some hardware combinations ]], it was discovered that disk performance is significantly better on smartarray equipped machines when in HBA mode, as opposed to organizing a JBOD configuration from single-disk RAID0s. Many of the HPs in the RESTBase cluster have already been setup this way, the remaining should be converted as well. The (9) machines in question are:
- [ ] restbase1010.eqiad.wmnet
- [ ] restbase1012.eqiad.wmnet
- [ ] restbase1014.eqiad.wmnet
- [ ] restbase2003.codfw.wmnet
- [ ] restbase2004.codfw.wmnet
- [ ] restbase2001.codfw.wmnet
- [ ] restbase2002.codfw.wmnet
- [ ] restbase2005.codfw.wmnet
- [ ] restbase2006.codfw.wmnet
NOTE: Given the findings of T189057, namely that it may be a mistake to correlate the poor IO performance with SmartArray-equipped HPs, I propose we replace the Samsungs in one of the above HPs with Intel SSDs in order to compare it with restbase2009 (which has 5 HP SSDs).