Scalla: Extended Features Supplement

Clustering

Configuration Reference

olbd & xrootd

Andrew Hanushevsky

Stanford Linear Accelerator Center

10-January-2007

Scalla: Structured Cluster Architecture for Low Latency Access

©2003-2007 by the Board of Trustees of the Leland Stanford, Jr., University

All Rights Reserved

Produced under contract DE-AC03-76-SFO0515 with the Department of Energy

This code is available under a BSD-style license allowing minimally restricted use.

1 Introduction. 5

1.1 Directives and Components. 8

1.1.1 Clusters with 64 or fewer data servers. 9

1.1.2 Clusters with 65 or more data servers. 11

1.1.3 Frequently asked questions. 14

1.2 Created Files. 16

1.3 Starting the olbd Process. 17

1.3.1 Running multiple olbd’s on the same host 20

2 Specifying Conditional Directives. 21

3 Mandatory Configuration Directives. 23

3.1 manager (mandatory for non-managers) 23

3.2 port (mandatory for managers) 25

3.3 role (mandatory for servers and supervisors) 27

3.3.1 Role Summary Table. 29

4 Common olb Configuration Directives. 31

4.1 allow.. 31

4.2 cache. 32

4.3 delay. 35

4.4 path. 39

4.5 perf 40

4.6 prep. 41

4.7 sched. 45

4.8 space. 47

5 Esoteric olb Configuration Directives. 49

5.1 adminpath. 49

5.2 fxhold. 50

5.3 fsxeq. 51

5.4 localroot 53

5.5 namelib. 54

5.6 nowait 55

5.7 pidpath. 56

5.8 ping. 57

5.9 remoteroot 59

5.10 trace. 60

5.11 xmilib. 61

6 Deprecated olb Configuration Directives. 63

6.1 subscribe.