Enclosure Id Display - R/Evolution 2000 Series Troubleshooting Manual

Enclosure ID Display

The enclosure ID (EID) display provides a visual single-digit identifier for each
enclosure in a storage system. The EID display is located on the left ear, as viewed
from the front of the chassis.
For a storage system that includes a controller module, EID values are set by the
RAID controller. For drive enclosures that are attached to a host for use as JBODs
(just a bunch of disks), EID values are set by the host.
When drive enclosures are attached to a controller enclosure
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The controller enclosure's EID is zero.
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A drive enclosure's EID is nonzero. The EID is 1 for the first drive enclosure,
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and the EID is incremented for each subsequent enclosure.
EIDs are persistent, so will not change during simple reconfigurations.
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EIDs can be used to correlate physical enclosures with logical views of the
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storage system provided by system interfaces such as RAIDar.
When drive enclosures are attached to a host
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A drive enclosure's EID can be zero or nonzero.
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Each drive enclosure in a storage system must have a unique EID.
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EIDs are persistent, so will not change during simple reconfigurations.
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EIDs can be used to correlate physical enclosures with logical views of the
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storage system provided by system interfaces.
When installing a system with drive enclosures attached, the enclosure IDs might
not agree with the physical cabling order. This is because the controller might have
been previously attached to some of the same enclosures and it attempts to preserve
the previous enclosure IDs, if possible. To correct this, make sure that both
controllers are up and perform a rescan using RAIDar (see "Correcting Enclosure
IDs" on page 63) or the CLI (see "rescan" on page
enclosures, but can take up to two minutes for the IDs to be corrected.
EIDs are managed by SES functions of the Expander Controller in each controller
module and expansion module.
For information about how EIDs are affected when expansion modules are moved,
see "Moving a Set of Expansion Modules" on page 89.
119). This will reorder the
Chapter 1 System Architecture 13