EMC VNX-VSS100 Capacity Planning and Ordering Guide
Performance and
capacity
considerations
Using the ordering
tables
•
VSS1 (24 TB) entry model – Consists of 6 drives that encompassed the vault
disks into a 4+1 RAID group and are part of the total usable storage
•
VSS2 (120 TB) entry model – Consists of 4 independent vault drives and
twenty-four 4 TB drives configured as a storage pool. The vault drives are not
used for usable storage.
•
Both models are expandable using 9-drive and 15-drive expansion packs and
up to 6 trays (DPE plus up to 5 DAEs)
•
We recommend the use of vault drives for storage applications of 96 TB raw
capacity or less
•
Performance improves with more/smaller RAID groups underlying the Storage
Pools
•
Capacity improves with larger/fewer RAID groups
•
For RAID 6 requirements we recommend the 6+2 RAID group configuration
•
For RAID 5 requirements we recommend the 4+1 or the 8+1 configurations
•
Maintain at least one hot spare per 30 drives in the array
•
Use the tables in this document to ensure the correct spare to disk ratio
•
Due to limited drive pack options, the final configuration may result in more
than 1 hot spare per 30 drives
1.
Pick the protection level required for the implementation (RAID 5 or RAID 6)
2.
Within the protection level select the RAID group table (4+1, 8+1, 6+2, 14+2)
3.
Find the row within the selected table that meets the storage capacity needs
for total usable capacity. This is a preformatted value and you must factor in
the operating system formatting overhead.
4.
Verify the bandwidth for the capacity arrived at in the above steps meets the
requirements. Please note that the numbers represented in the table are
based on a single storage processor (SP). Using a VSS100 with the maximum
number of drives and both storage processors, 500MB/s may be used.
5.
Use the columns under VSS1 or VSS2 ordering information to help determine
the bill of materials.
Note: Orange highlighted cells indicate the configuration has 24 total disks or less. In this
configuration the 4 vault drives combine with an additional drive to form a RAID 5, 4+1 RAID
group. The sixth drive is considered a spare. All other disks are part of a Storage Pool.
Note: The RAID group configuration that includes the vault disks is not eligible for Storage
Pool inclusion.
Note: Green highlighted cells indicate that the configuration is based on a 4-disk vault and
all other disks are part of a single storage pool.
Capacity Planning and Ordering Guide
VNX-VSS100
1
Ordering tables
RAID 5
Table 1.
RAID 5 4+1
VSS1 or VSS2 ordering information
RAID 5 4+1
Absolute totals
Order
Order Order Total
Total usable
VSS100
9156Total Total
Total
capacity
subBase raw disk
disk
disk
915- Total raw
(preformatted) model capacity packs packs vault disk disk disks TB
10.56
VSS1
24TB
0
0
1
0
0
6
24
24.88
VSS1
24TB
1
0
1
1
0
15
60
53.53
VSS1
24TB
2
0
1
2
0
24
96
71.61
VSS1
24TB
3
0
1
3
0
33
132
100.26
VSS1
24TB
4
0
1
4
0
42
168
114.58
VSS2
120TB
2
0
1
3
1
48
192
128.90
VSS1
24TB
5
0
1
5
0
51
204
143.23
VSS2
120TB
3
0
1
4
1
57
228
157.55
VSS2
120TB
2
1
1
3
2
63
252
186.19
VSS2
120TB
3
1
1
4
2
72
288
200.52
VSS2
120TB
2
2
1
3
3
78
312
Table 2.
Spares
Usable
Bandwidth
MB/s
1
5
4
4
3
4
2
3
4
3
4
40
67
93
75
187
208
228
247
265
298
313
RAID 5 8+1
VSS1 or VSS2 ordering information
RAID 5 8+1
Absolute totals
Order
Order Order Total
Total usable
VSS100
9156capacity
sub8+1 Base disk
disk
disk
9(preformatted) model Capacity packs packs vault disk
10.56
VSS1
24TB
0
0
1
0
39.21
VSS1
24TB
1
0
1
1
57.29
VSS2
120TB
0
0
1
1
67.85
VSS1
24TB
2
0
1
2
85.94
VSS1
24TB
3
0
1
3
114.58
VSS1
24TB
4
0
1
4
143.23
VSS2
120TB
1
1
1
2
171.87
VSS2
120TB
2
1
1
3
200.52
VSS2
120TB
3
1
1
4
229.16
VSS2
120TB
1
3
1
2
15disk
0
0
1
0
0
0
2
2
2
4
Total
disks
6
15
30
24
33
42
54
63
72
84
Total
raw
TB
24
60
120
96
132
168
216
252
288
336
Spares
Usable
Bandwidth
MB/s
1
1
8
1
2
2
5
5
5
8
40
110
115
115
170
210
245
275
300
320
Capacity Planning and Ordering Guide
VNX-VSS100
2
RAID 6
Table 3.
RAID 6 6+2
VSS1 or VSS2 ordering information
RAID 6 6+2
Total usable
capacity
(preformatted)
10.56
32.04
53.53
64.45
85.94
107.42
128.90
150.39
171.87
Order
VSS100
submodel
VSS1
VSS1
VSS1
VSS2
VSS2
VSS2
VSS2
VSS2
VSS2
Table 4.
Base
raw
capacity
24TB
24TB
24TB
120TB
120TB
120TB
120TB
120TB
120TB
Order Total
Order
1569-disk disk
disk
9packs packs vault disk
0
0
1
0
1
0
1
1
2
0
1
2
0
0
1
1
1
0
1
2
2
0
1
3
1
1
1
2
2
1
1
3
3
1
1
4
Total usable
capacity
(preformatted)
50.13
100.26
100.26
150.39
150.39
200.52
15- Total
disk disks
0
6
0
15
0
24
1
30
1
39
1
48
2
54
2
63
2
72
Total
raw
TB
24
60
96
120
156
192
216
252
288
Spares
Usable
Bandwidth
MB/s
1
2
3
2
3
4
2
3
4
40
40
75
109
142
174
205
235
164
Spares
Usable
Bandwidth
MB/s
4
3
6
2
5
4
170
210
210
275
275
320
RAID 6 14+2
VSS1 or VSS2 ordering information
RAID 6 14+2
Order
VSS100
submodel
VSS1
VSS2
VSS1
VSS2
VSS2
VSS2
Absolute totals
Base
raw
capacity
24TB
120TB
24TB
120TB
120TB
120TB
Absolute totals
Order Total
Order
1569-disk disk
disk
9packs packs vault disk
2
0
1
2
1
0
1
2
4
0
1
4
1
1
1
2
3
0
1
4
3
1
1
4
15- Total
disk disks
0
24
1
39
0
42
2
54
1
57
2
72
Total
raw
TB
96
156
168
216
228
288
Capacity Planning and Ordering Guide
VNX-VSS100
3