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Power Tools 1993 November - Disc 2
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Power Tools Plus (Disc 2 of 2)(November 1993)(HP).iso
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wsdaperf.txt
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1993-07-23
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The following performance results were measured in the NSD lab
in Boise using a S/720 and the Workstation Disk Array.
RAID 5: TRANSACTION RATES (I/Os per second)
--------------------------------------------
RAID 5, 5 drives, 100 MB seek, 8K random IOs, 100 MB seek,
cache on, sync on:
READ to WRITE RATIO
Mech Size 64:0 44:22 32:32 22:44 0:64
3.5 " 240 110 98 88 37
5.25" 251 123 110 97 41
...using 1 MB Seek...
3.5" 312 152 132 110 42
5.25" 327 172 149 124 46
RAID 5: TRANSFER RATES (Megabytes/sec)
---------------------------------------
Sequential transfers, 100 MB file
I / O S I Z E
Mech Size Operation 8K 64K 256K
3.5" Read 1.36 1.62 1.66
3.5" Write 0.24 0.24 0.24
5.25" Read 1.35 1.61 1.64
5.25" Write 0.26 0.26 0.26
RAID 3: TRANSFER RATES (Megabytes/sec)
----------------------------------------
RAID 3, raw mode (through raw port), sequential data, cache on
synch on, 5 disks, 100 MB file, "RMSEQ" Program:
I / O S I Z E
Mech Size Operation 8K 16K 32K 64K 128K 256K
3.5" Read 1.18 2.05 3.27 4.62 5.78 6.29
3.5" Write 1.15 1.97 3.06 4.16 5.20 5.76
5.25" Read 1.16 2.04 3.21 4.67 5.93 6.85
5.25" Write 1.15 1.96 3.06 4.22 5.23 5.76
RAID 3, through file system, sequential data, cache on, 5 disks,
100 MB file, "PERF" Program:
Mech Size Operation 8K 16K 32K 64K
3.5" Read 1.39 2.45 3.87 5.25
3.5" Write 1.34 2.26 3.44 4.62
5.25" Read 1.41 2.43 3.87 5.37
5.25" Write 1.36 2.30 3.51 4.75
RAID 0/1, Mirroring: TRANSFER RATES (I/Os per second)
------------------------------------------------------
6 disk mechanisms, 8K random IOs, 1 MB seek, cache ON
READ to WRITE RATIO
Mech Size 64:0 44:22 32:32 22:44 0:64
3.5" 264 188 180 173 196
5.25" 266 201 188 181 193
RAID 0: TRANSFER RATES (I/Os per second) NOTE: No data protection
-----------------------------------------
8K random IOs, 1 MB seed, cache ON, sync ON
Mechanism READ to WRITE RATIO
Mech Size Quantity 64:0 44:22 32:32 22:44 0:64
3.5" 5 314 291 287 291 315
3.5" 6 278 257 266 273 309
5.25" 5 315 309 303 306 315
5.25" 6 293 280 281 288 315
RELIABILITY:
-----------
RAID 3 or 5, 5.25" mechanisms -- quantity 5
MTBF: 21,900 hrs
MTBDNA: (Mean time between data not available) 81,824 hrs = 9 years