Dell PowerVault MD3820f - Manual (Page 9)

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Table 3. MD-Series Storage Array Rules for Non-Dense, 2U Models Only (MD3400,
MD3420, MD3800i, MD3820i, MD3800f, and MD3820f)
MD3400
series
MD3800i
series
MD3800f
series
RULE
12Gbps
SAS
10Gbps
iSCSI
16Gbps
Fibre
Channel
Support for up to 120 physical disk slots (system default
configuration).
Up to nine MD1200 and/or MD1220 series expansion enclosures
can be attached to an MD storage array. Any mixture of MD1200
and MD1220 enclosures for a total of 120 physical slots is
supported.   
Support for up to 192 physical disk slots through a premium
feature option.
Up to fifteen MD1200 and/or MD1220 series expansion
enclosures can be attached to an MD storage array. Any mixture
of MD1200 and MD1220 enclosures for a total of 192 physical
slots is supported.   
Maximum number of physical disks in a RAID0, RAID1/10 is 120.   
Maximum number of physical disks in a RAID5 or RAID6 disk
group is 30.
  
Attached MD1200 series expansion enclosures must be run in
unified mode.
  
The number of Snapshots (Legacy) is limited to:
 maximum of 256 per array
 maximum of 16 per VD
  
The number of Remote Replicas (Legacy) is limited to:
 maximum of 16 pairs
N/A N/A 
The number of Snapshots is limited to:
 maximum of 512 per array
 maximum of 128 per VD (32 per snapshot group with a
max of 4 snapshot groups per VD)
  