When you set up your enclosure, read the following rules:
• Only 12 Gb enclosures are allowed in a SAS chain.
• In a single SAS chain, the configuration of ESM, cooling unit, PCM, and PSU should be the same.
• Mixed types of enclosures are allowed in configuration.
• Set up enclosures by reverse cabling. For more information, refer to Figure 49 “Single host with dual host
adapters- Multiple 5U Enclosures” on page 45.
• The maximum configuration differs between different types of enclosures:
– 2U enclosures only: supports up to a maximum of 8 enclosures or 192 drives.
– 5U enclosures only: supports up to a maximum of 4 enclosures or 336 drives.
– Mixed enclosures: supports up to a maximum of two 5U enclosures and two 2U12 enclosures, a
maximum of two 5U enclosures and one 2U24 enclosures or a maximum of 192 drives.
One of the basic configurations is multiple enclosures connected to single or dual host adapters shown as
below.
Notes: When the cabling allows multiple hosts to access the same group of drives, read the following rules:
• One host can access the drives in the JBOD ESMs at any time. See Figure 44 “Single host with single host
adapter- Multiple 2U Enclosures” on page 42 and Figure 45 “Single host with dual host adapters- Multiple
2U Enclosures” on page 43.
• One or more RAID adapters in the host can access the drives in the JBOD ESMs. Clustering is not
supported in this condition.
• One or more non-RAID adapter (HBA) in the host can access the drives in the JBOD ESMs. Clustering is
supported in this condition. See Figure 45 “Single host with dual host adapters- Multiple 2U Enclosures”
on page 43.
Figure 44. Single host with single host adapter- Multiple 2U Enclosures
42 Lenovo Storage D1212/D1224/D3284Hardware Installation and Maintenance Guide
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