 |
|
|
DASD I/O rates can be improved by defining logical volumes in
Linux with the Logical Volume Manager (LVM). Tests with sequential
I/O showed acceptable scaling for DASD striping for block read:
SCALING
|
2 disks
|
4 disks
|
8 disks
|
ESCON:
|
2x
|
3x
|
6x
|
FICON Express
|
2x
|
3x
|
5x
|
Changing connectivity from ESCON to FICON Express improves
performance by 50% to 100%.
|
- IBM eServer zSeries 900 (2064-116)
- IBM TotalStorage Enterprise Storage Server 2105-F20
- Linux 31bit, kernel 2.4.17
- LPAR with 2 CPUs and 128MB memory
- Benchmark Bonnie 2.0, block write and block read, file size
512MB
- Stripe size 64KB
- File system ext2
|
|
|
|
|
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