wiki:InfrastructureWGMeetingD20091012
Last modified 10 years ago Last modified on 10/12/2009 02:43:49 PM

We will be having our regular bi-weekly Infrastructure WG telecon on Monday, October 12, at 12 Noon CT.

Agenda

  • Workflow for Cost Estimate spreadsheet request/updates/changes
  • Base Site Infrastructure
    • Power & Cooling (Ticket #855)
      • Power & Cooling costs are current set to be equal. Is this true, or can we improve our model?
      • Price per kWh is current set at 5 cents. Should it be 12 cents for Chile? Or something else?
    • Lease (Ticket #960)
      • Double checking: Lease costs for Base Site are covered by Telescope and Site and should be omitted from DM estimates.
  • Minimum Spindle Count Requirements (Tickets #942, #943)
    1. Double checking: For the AOS (both at ArchSite and BaseSite), we don't care about spindle count and only want to optimize for lowest $/TB (for both database and file storage at the AOSs).
    2. Double checking: Optimizing I/O rates by ensuring a minimum number of spindles only applies to the CSS database storage (not the CSS file storage).
    3. Double checking: Database sizing is identical for both the ArchCSS and the BaseCSS (specified in Doc 1990).

Notes

Attendees: ChrisC, K-T, BillB, Ron Lambert, MikeF

Please correct any errors or omissions directly on this page!

  • Base Site Infrastructure
    • Power & Cooling (Ticket #855)
      • Price per kWh is current set at 5 cents. Should it be 12 cents for Chile? Or something else?
        • Power costs will certainly be different in La Serena than in Champaign. InfraWG will morph the cost model. Ticket #855.
        • Ron Lambert will provide cost estimates for power in La Serena (today's cost is ~10-12 cents kWh).
      • Power & Cooling costs are current set to be equal. Is this true, or can we improve our model?
        • The consensus is that we do not have a better ratio to use (ratio of cooling costs to power costs), for either the Base Site or the Arch Site. [Note: This is not a closed issue, but 1-to-1 will continue to be our default for now]
    • Lease (Ticket #960)
      • Double checking: Lease costs for Base Site are covered by Telescope and Site and should be omitted from DM estimates.
        • Per Ron Lambert, there are no lease costs associated with the Base Site. Updated ticket #960.
  • Minimum Spindle Count Requirements (Tickets #942, #943)
    1. Double checking: For the AOS (both at ArchSite and BaseSite), we don't care about spindle count and only want to optimize for lowest $/TB (for both database and file storage at the AOSs).
      • [Jacek] Yes, that is the current thinking. I can imagine we may be pressed to cut a release in a short period of time, which will put more pressure on disk I/O for database (especially in final stages, like re-partitioning or building indexes)
    2. Double checking: Optimizing I/O rates by ensuring a minimum number of spindles only applies to the CSS database storage (not the CSS file storage).
      • [Jacek] That is what was discussed, but given there are more I/O intensive activities related to file storage that we originally anticipated, this might require rethinking
    3. Double checking: Database sizing is identical for both the ArchCSS and the BaseCSS (specified in Doc 1990).
      • [Jacek] database sizing: yes (images sizing: no)

  • DC3b Hardware Requirements
    • InfraWG is looking forward to the Tue call, but will assume as a default that 200K SUs is enough.
  • Workflow for Cost Estimate spreadsheet request/updates/changes
    • The InfraWG is using a new workflow process for cost sheet tracking/changes, and will publish and review during the next call a new Cost Sheet, Workflow Diagram, Cost Summary Comparisons with Baselines, WBS-to-Cost Sheet mappings diagram after a couple of key (external) data elements are verified.