Dell PowerVault MD3000 Bedienungsanleitung PDF herunterladen (Seite 17)

Dell™ PowerVault MD3000 and MD3000i Array Tuning Best Practices

December2008–RevisionA01 Page17

In the first generation of firmware (see Figure 5), this can be determined from the

‘Avg. Blocks’ row which represents the average I/O block size encountered. In

Generation One, the ‘Large IO’ field denotes a 4096 block or 2MiB size with zero

registered Large Reads or Writes during the sample period. Any single host

received I/O greater than the Large I/O size is broken down into chunks less than

or equal to the stated Large I/O value. It is extremely rare for a host to send such

large I/Os.

With second generation firmware (see Figure 6), the ‘Avg. Blks’ column

represents the average the I/O block size encountered. In Figure 6, the

‘LargeIoSize’ field denotes a 2MiB size with zero registered Large Reads or

Writes during the sample period.

Volume 0 Attributes:

Volume Type: RAIDVolume

User Label: MyRAID10_One

...

BlockSize: 512 bytes

LargeIoSize: 4096 blocks

...

Perf. Stats: Requests Blocks Avg. Blks IO Percent

Reads 67456452 5943724625 88 71.20%

Writes 27283249 1144902648 41 28.80%

Large Reads 0 0 0 0.00%

Large Writes 0 0 0 0.00%

Total 94739701 7088627273 74 100.00 %

Virtual Disk Unit 0 Configuration

Volume Type: 13+1 RAID 5

User Label: MyRAID5_1

Block Size: 512 bytes

Large IO: 4096 blocks

Segment Size: 256 blocks

Stripe Size: 3328 blocks

...

IO Statistics:

small small large large cache

reads writes reads writes total hits

requests 2028332119 147699066 0 0 2176031185 1289775370

blocks 3091968111 2518067526 0 0 1315068341 4019884678

avg blocks 4 17 0 0 0 3

IO pct. 93.21% 6.78% 0.00% 0.00% 0.00% 59.27%

Figure 6: Second Generation Firmware - Volume Attributes Performance Stats; taken

from RAID 1 volume. File: stateCaptureData.txt

Figure 5: First Generation Firmware - Stripe Size. File: stateCaptureData.txt

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 31 32

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