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Phenix updated installation and configuration status - 2nd March 2007
Minutes of the phone call held the 2nd March 2007
Participants:
Sergio Maffioletti
Status of installation and configuration
WN (X2200)
SLC4.4 [tobe finalized and integrated into cfengine]
CE (X4200)
1 X4200 used for PNFS + postgres [ok]
Thumper
1 Thumper integrated as pool node [ok]
Configuration of pools (Alessandro will report)
Problem encoutered, solutions and workarounds
*
Tests
(tentative dates)
Reliability tests on whole system (Derek + Tom + Alessandro) -->
Performance test from WNs to Thumpers via dcache (Derek + Sigve + Alessandro) -->
Test different configurations of ZSF [ok]
Organisation of the dCache tests
functionality tests
VO codes
local load tests (mainly dcap):
writing files in parallel from multiple nodes
reading same file from multiple nodes
trying to write file that is being written by another process
erasing file that is being read by another process
measure I/O rates as function of parallel clients
WAN protocol tests (SRM, gridftp)
CMS
PhEDEx
transfers
Storage access profile of CMS jobs -> they will use dcap protocol
Storage access profile of Atlas jobs -> for those using ARC, maily the access is through SRM and/or Gridftp
each VO should prepare their own specific tests
General test suite ( local and wan test ) will be prepared by Derek
Sigve will forward the test description to the Atlas contact to check if Atlas will need additional tests
SE dcache configuration scenario
is it necessary to mount PNFS on Thumper ? apparently yes if Thumper is running Gridftp ( thanks to Lionel Schwarz )
what is necessary for WN to use the dcap protocol to access the dcache pools ? apparently the client-only dcache package ( Alessandro will check )
What bandwidth can we expect:
We may have preformance problem from Dalco WNs to Thumper due to single Gb link from switch to switch
Deadlines
next week --> tests
15th March --> production
AOB
update UI machine (Strange java exception errors)?
UI will be re-installed in the next two weeks
Proposal to migrate to a server box ( gain reliability )
VOBoxes
should we reinstall as true LCG VO-Boxes? This would provide gsissh and easier myproxy management
We are planning to migrate these boxes anyway
responsibility for Twiki areas (CSCS will take care)
Create 1 page per VO
add a page with logs of problems
VOBoxes page with info about how to start services
Resume of the Configuration
1 X2200 = cluster management system
1 X2200 = SRM + dcache domains + LCG SE related software
1 X4200 = PNFS + posgres
1 X4500 Thumpers = Gridftpd + dcache pool node
1 X4500 Thumpers = Gridftpd + dcache pool node
ZFS configuration (Proposal):
1 Thumper test with 4 Raid and 2 parity disks = 16TB + 4 spare disks
1 Thumper test with 4 Raid and 1 parity disk = 18TB + 4 spare disks
1 ZFS pool per Thumper
1 Filesystem per VO per Thumper
each VO gets space on both Thumpers
Thumper dcache configuration
each Thumper will have 1 dcache pool per VO/FS (CMS,Atlas,dteam)
1 Thumper will also have FS for lhcb and hone
--
SergioMaffioletti
- 2 March 2007
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Topic revision: r2 - 2007-03-02
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SergioMaffioletti
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