| Excerpt |
|---|
Summer 2013 and winter 2014, there were an inordinate number of power outages in Baker Lab, and other Chem buildings! |
See also
ChemIT's record of recent power outages
...
- Because we don't know the answer to this question following any specific power outage, we are reluctant to turn back on servers right away. Instead, we like to wait ~10-25 minutes.
What would it cost to UPS our research systems?
Assuming protection for 1-3 minutes MAXIMUM:
Do all head nodes and stand-alone computers in 248 Baker Lab
- Started getting done. About $180 (APC brand) per head node or server every ~3-4 years (3 yr for warranty and ~4 years actual battery life). And ~$900/ set of 4 GPU systems every ~3-4 years (to confirm approach and estimates).
CCB head nodes' UPS status:
Remaining UPS's to invest in
Clusters
Most we been done Spring 14, after the spate of power failures. See CCB's HPC page (first chart, in "UPS for headnode" column) for details
Cluster | Done | Not done | Notes |
|---|---|---|---|
Loring |
| X | Unique: Need to do ASAP |
Abruna |
| X | Unique: Need to do ASAP |
Non-clusters
See CCB's HPC page (second chart, in "UPS" column) and CCB's non-HPC page (in "UPS" column) for details of the few that are already done.
Stand-alone computers' UPS status:
Computer | Done | Note done | Notes |
|---|---|---|---|
Coates: MS SQL Server |
| X | Unique: Need to do ASAP |
Freed: Eldor |
| X | Unique: Need to do ASAP? (Q: Is OS backed up?) |
Baird: 1 rack-mounted computational computer |
| X | Need? |
|
|
|
|
Review others at above two cited pages which might need a UPS, after above ones done.
Switches
Do all switches: Maybe ~$340 ($170*2), every ~4 years.
- Recommend: Do ASAP.
- Q: Funding?
- Other issues and concerns with actually implementing this approach:
- Rack space. Maybe power. Maybe cord lengths. What other issues?
Do all compute nodes: ~$18K initially, and perhaps ~$4.5K every ~4 years to replace batteries and deal with UPS hardware failures.
- ~20 20amp UPS's ($900 each) required.
- Replacement batteries ~$200 each, or ~1/4 replacement cost.
- Estimates are simply back-of-the-envelope calculations.
- If were to actually implement, there may be smarter ways to do this, but the total cost will likely not be lower.
- In fact, costs may be higher, if sufficiently higher benefit doing it a different way, for example.
- Issues and concerns with actually implementing this approach:
- Costs. Rack space. Maybe power. Maybe cord lengths. What other issues?
Compute node counts, for UPS pricing estimates. Does not include head node:
- Count source: ChemIT's Computer counts with CCB clusters
...
Cluster
...
Compute node count
...
Power strip equivalents
(~8/strip MAX)
...
Cost estimate,
every 4 years
...
Notes
...
Collum
...
8
...
1
...
$900
...
...
Lancaster, with Crane (new)
...
10
...
2
...
$1.8K
...
...
Hoffmann
...
19
...
2
...
$1.8K
...
...
Scheraga
...
91
...
13
...
$11.7K
...
Loring
...
4
...
1
...
$900
...
...
Abruna
...
9
...
1
...
$900
...
...
C4 head node: pilot
Widom's 2 nodes there.
...
N/A
...
N/A
...
N/A
...
This CCB Community head node pilot has no compute nodes of its own.
It hosts compute nodes from CCB researchers.
...
Widom
...
2
...
1
...
?
...
Compute nodes are hanging off of "C4" head node, above.
...
TOTALS
...
~140?
...
21
...
...
Procedures and reminders
Reboot switches?
...