Dell PowerVault MD3000i Handmatig afstemmen - Pagina 15
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Dell™ PowerVault MD3000 and MD3000i Array Tuning Best Practices
Figure 2: First Generation Firmware - RAID Level. File: stateCaptureData.txt
Virtual Disk Unit 0 Configuration
Volume Type:
User Label:
Block Size:
Large IO:
Segment Size:
Stripe Size:
...
IO Statistics:
requests
blocks
avg blocks
IO pct.
reads
writes
write
algorithms
Figure 3: Second Generation Firmware - RAID Level. File: stateCaptureData.txt
Volume 0 Attributes:
Volume Type:
User Label:
...
BlockSize:
LargeIoSize:
...
Perf. Stats:
4.7.3 I/O Distribution
I/O can be characterized by its distribution and pattern. The two primary factors
in determining the I/O distribution of an application are the randomness of I/O
and the direction of I/O. The randomness of I/O indicates how sequential or
random the data access is, as well as the patterning of this data access. The
direction of the I/O can be simply related to the read and write percentages of
I/O, that is, the direction I/O is taking from the storage device. I/O pattern refers
December 2008 – Revision A01
13+1 RAID 5
MyRAID5_1
512 bytes
4096 blocks
256 blocks
3328 blocks
small
small
reads
writes
2028332119
147699066
3091968111 2518067526
4
93.21%
6.78%
IOs
stripes
2028332119 2034477363
147699066
148449472
Full
Partial
1105611
12598366
RAIDVolume
MyRAID10_One
512 bytes
4096 blocks
Requests
Reads
67456452 5943724625
Writes
27283249 1144902648
Large Reads
Large Writes
Total
94739701 7088627273
large
reads
writes
0
0
17
0
0.00%
/IO
clusters
1.00 2107869128
1.00
157404718
RMW
No Parity
32120072
Blocks
Avg. Blks
0
0
0
0
large
total
0 2176031185 1289775370
0 1315068341 4019884678
0
0
0.00%
0.00%
/IO
1.03
1.06
RMW2
0
0
IO Percent
88
71.20%
41
28.80%
0
0.00%
0
0.00%
74
100.00%
cache
hits
3
59.27%
FSWT
0
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