Meeting Date

• TEAMS: 2024-03-06

Invited

Anthony (group leader), Lori, Dave, O, Clayton, Guoxiang, Nathan, Nick, Todd, Ed, Devon, Gwen

Attendees

• Anthony, Clayton, Devon, Nick, Guoxiang, Fraser, Nathan

Review and accept previous meeting minutes.

CsLWGMeeting20240221

Review last meeting's Action Items

linux.cscf.uwaterloo.ca

• New linux.cscf.uwaterloo.ca running Ubuntu 22.04 is almost ready - soft roll out next week
  • More delays due to security concerns
    • See RT#1305903 for an assortment of concerns
    • See RT#1313655 for improved approach
  • More delays - a2brenna

New DFSc Hardware

• Vendor failing to provide reasonable updates
• Going to Plan B, cobbling together available non-rotational storage
• Still has not arrived, vendor has not given an ETA (no shipment information)
• Looking into adjusting the balance of placement groups on the cluster to better distribute load -a2brenna
  • Need to look into OSD performance beforehand
• We're expecting the same load from March 2023 (which previously caused issues)
  • Kernel patches have been deployed
  • Machines are no longer crashing, but are therefore no longer clearing out user sessions over the course of a term
  • Compared to the previous year, we seem to be in much better shape server-wise
    • Memory usage is down (reasons unclear)
    • Snapshots were previously enabled until March (and re-enabled in July, then off again in September)

Snapshots

• There's still a need to this
• Performance problems need to be investigated (need to look into old RTs and reproduce) -a2brenna
• Performance uplift from switching to SSDs might help with performance issues

Disk Benchmarking

• Looking for any and all suggestions on disk performance benchmarking utilities
• kcbench (dmerner) - https://www.mankier.com/1/kcbench
• fio

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