Sandia National Laboratories

TEST4

Description:
Each test performed is a file-per-process test where each file is a 2 stripe file (utilizing 2 OST's). In this test the OST's are allocated such that one OST per OSS is used until the maximum number of OSS's (4) is achieved. Once one OST per OSS is used the remaining OST on each OSS is allocated in order. This is repeated for the required number of OST's.


Purpose:
The primary purpose of this test is to test oversubscription of OST's in the ratio of approximately 60:1 which is roughly the ratio of compute nodes to IO targets for Red Storm. By limiting the number of OST's to 8 (on 4 OSS's) we could test very large numbers of clients in a reasonable amount of time.

Performance

AVG PER OST Performance

 

AXES:
Y- MiB/sec aggregate transfer for each datapoint
X - <clients.stripe> increasing client count from 1-496, Constant stripe count of 2.

Testing Parameters:
TEST CODE:    IOR
VERSION:    2.8.10
API:    POSIX
ACCESS:    file-per-process
MAX OST's:    8
MAX OSS's:   4


Phase 1 - TEST4

Data in TABLE format

RAW data

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