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The following chart shows the transaction throughput for the
different I/O schedulers relative to the "as
scheduler".
The "as
scheduler" is designed to optimize the access
physical disks. Its strategy is not suitable for storage servers
like the ESS. Thus, it is not a good choice for this environment.
All other schedulers are similar. For further tests we used the
"deadline scheduler".
- IBM eServer zSeries 900 (2064-216)
- IBM TotalStorage Enterprise Storage Server 2105-800
- LPAR with 8 CPUs, 2GB memory
- Novell/SUSE SLES 9 for IBM zSeries (64-bit), kernel 2.6.5
- Informix 9.5 FC3 (64-bit)
- Benchmark Informix OLTP
- Database data Logical Volume (LV): 8 CHPIDs, 8 host adapters,
FCP/SCSI disks in 8 ranks, ext2 filesystem
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