l
The maximum number of shelves displayed in the product's cabling table cannot be
exceeded.
l
You cannot have more than four ES20s in a single set (maximum preference is
three).
l
You cannot have more than five ES30s in a single set (maximum preference is
four).
l
You can have a maximum of seven ES30s for systems with Extended Retention
software.
l
There are no specific placement or cabling requirements for the metadata shelves
for DD Cloud Tier configurations. These shelves can be installed and cabled the
same way as standard ES30 shelves.
An ES20 requires more power than an ES30. Ensure that your rack is configured to
handle the power needs.
The tables below show how to configure a mixed system. To use the tables, go to the
appropriate system. Then find the number of ES20s that are to be configured in the
first column. The next column defines the number of ES20 sets. If there are multiple
rows with the same number of ES20s then pick the row with the appropriate number
of ES20 SATA shelves. The next column in that row defines the number of sets of
ES30 SATA shelves. Finally, there may be entries for the number of desired ES30 SAS
shelves and the number of sets to be used.
If the combinations of shelves exceed the supported usable storage, there may not be
an entry. The entries are based on the smallest usable storage per shelf type (12TB for
ES20, 12 TB for ES30 SATA, and 24TB for ES30 SAS). Always check that the sum of
the usable storage of all of the shelves does not exceed the supported usable storage
of the configuration.
Table 20
Minimum and maximum configurations
System Minimum
appliance shelf
count
Maximum appliance
shelf count
DD Cloud Tier
systems in TB
Extended Retention
systems (ER) in TB
Max shelves
for ER
4200
(192)
1 16
l
189
l
90 for
metadata
l
DD OS 5.4 and earlier: 576
l
DD OS 5.5 and later: 385
32
4500
(288)
2 20
l
285
l
120 for
metadata
l
DD OS 5.4 and earlier: 1152
l
DD OS 5.5 and later: 576
40
7200
(384)
3 20
l
428
l
240 for
metadata
l
DD OS 5.4 and earlier: 1728
l
DD OS 5.5 and later: 768
56
Systems without Extended Retention or DD Cloud Tier all support four chains. The
following tables show combinations of ES20 and ES30 shelves. For combinations of
any two types of shelves, these tables can be used as a guide.
Installing the Shelves
DD4200, DD4500, and DD7200 cabling 45
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