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The following details the maximum values common to all four X-Brick models and the maximums applicable to each specific X-Brick model. As of XtremIO Verison 4.0 there are four types of X-Brick model to chose from:

1. 5TB Starter X-Brick
2. 10TB X-Brick
3. 20TB X-Brick
4. 40TB X-Brick

An XtremIO storage system has a Scale-Out architecture and can include a single X-Brick or a cluster of multiple XBricks(2,4,6 or 8 X-Brick clusters):

Universal Maximums
Maximum values common to all 4 X-Brick models:
• Storage Controllers per X-Brick = 2
• A single Xtremio Management Stations(XMS) can manage up to 8 clusters. XMS Multi-cluster support is a new feature of 4.0 and allows clusters running 4.x code and above to be managed by a single XMS. When an XtremIO 3.0 cluster is upgraded to 4.x then it can be added to an XMS 4.x managing multiple clusters.
• Initiators per cluster(FC or iSCSI) = 1024
If you consider a host has 2 initiators this would imply a max of 512 hosts.
• Initiators per Initiator Group = 64
If you consider a host has 2 initiators this would imply a max of 32 hosts per Initiator Group.
• Initiator Groups per cluster = 1024
• Volumes per cluster = 8192
• Number of Initiator Groups mappings per Volume = 64
• Number of Volumes mappings per Initiator Group = 2048

• Mappings per cluster (10 Volumes mapped to 10 Initiator Groups results in 100 mappings) = 16,384
Example: Maximum Mappings per cluster:
The only way we would ever reach the maximum of 16,384 mapping is if volumes were shared across multiple initiator groups. Example maximum mapping configuration:
2048volumes assigned to IG1 & IG2 = 4096 mappings
2048volumes assigned to IG3 & IG4 = 4096 mappings
2048volumes assigned to IG5 & IG6 = 4096 mappings
2048volumes assigned to IG7 & IG8 = 4096 mappings
TOTAL = 8192volumes / 16,384 mappings

• Snapshots per production Volume = 512
• Consistency Groups = 512
• Volumes per Consistency Groups = 256
• Consistency Groups per Volume = 4
• iSCSI portals per X-Brick = 16
• Physical iSCSI 10Gb/s Ethernet ports per X-Brick = 4
• iSCSI routes per cluster = 32
• Physical FC 8Gb/s ports per X-Brick = 4
• Largest block size supported = 4MB
• Maximum Volume size = 281.4TB / 256TiB (Starter X-Brick = 132TB / 120TiB)
• Maximum volumes presented to VPLEX = 4096

40TB X-Brick
25*1600 GB eMLC SSDs per X-Brick
• Number of X-Bricks per cluster = 8
• Raw Capacity = 40TB / 36.4TiB
• Usable physical capacity per X-Brick = 33.6TB / 30.55TiB (with no data reduction)
• Maximum logical capacity per X-Brick = 201.6TB / 183.3TiB (with the use of data reduction techniques such as Thin Provisioning, inline compression and inline deduplication. As you can see these figures are based on a 6:1 ratio (33.6TB * 6 = 201.6TB) and will vary depending on types of data sets residing on XtremIO.)

20TB X-Brick
25*800 GB eMLC SSDs per X-Brick
• Number of X-Bricks per cluster = 8
• Raw Capacity = 20TB / 18.2TiB
• Usable physical capacity per X-Brick = 16.7TB / 15.2TiB (with no data reduction)
• Maximum logical capacity per X-Brick = 100.2TB / 91.2TiB (with the use of data reduction techniques based on a 6:1 ratio (16.7TB * 6 = 100.2TB))

10TB X-Brick
25*800 GB eMLC SSDs per X-Brick
• Number of X-Bricks per cluster = 4
• Raw Capacity = 10TB / 9.1TiB
• Usable physical capacity per X-Brick = 8.33TB / 7.6TiB (with no data reduction)
• Maximum logical capacity per X-Brick = 50TB / 45.5TiB (with the use of data reduction techniques based on a 6:1 ratio (8.33TB * 6 = 50TB))

5TB Starter X-Brick
13*400 GB eMLC SSDs
A starter X-Brick has 13 eMLC SSDs(a standard X-Brick has 25 eMLC SSDs), a starter X-Brick can be expanded to a standard 10TB X-Brick by adding 12 SSDs. Once the starter X-Brick has been expanded to a 10TB X-Brick then it may be scaled-out as per a std. 10TB X-Brick to two and four X-Brick clusters.
• Number of X-Bricks per cluster = 1
• Raw Capacity = 5.2TB / 4.7TiB
• Usable physical capacity per X-Brick = 3.6TB / 3.3TiB (with no data reduction)
• Maximum logical capacity per X-Brick = 21.5TB / 19.5TiB (with the use of data reduction techniques based on a 6:1 ratio (3.6TB * 6 = 21.5TB))

Note: 1 Kilobyte = 1000 bytes whereas 1 Kibibyte = 1024 bytes ( 1TB = 1000(bytes)⁴ & 1TiB = 1024(bytes)⁴)

PERFORMANCE
Referenced from the following data sheet: EMC XTREMIO 4.0 SYSTEM SPECIFICATIONS