severity. The SIM type (byte 28) indicates the component that experienced the error. When the
value of byte 22 is 21, the SIM is a control unit SIM. When the value of byte 22 is Dx (where x
is an arbitrary character), the SIM is a device SIM.
Figure 18 Typical SIM with reference code and SIM type
NOTE: The SIMs shown below are reported to the host, except 21 81.
The following table shows SIMs reference codes, and provides useful information for identifying
issues and determining the system experiencing the problem. All SIMs are reported to the host,
except 21 80.
Table 20 SIM reference codes, types, and descriptions
SVP log
file
System generating the
SIM
DescriptionSeverityReference code
Byte 23Byte 22
SIM LogPrimary
system/Secondary
system
Logical path is blocked due to a failure.Moderate8021
SSB LogPrimary
system/Secondary
system
Logical path is restored.Service8121
SIM LogPrimary
system/Secondary
system
Line failure is reported by the extender.Moderate8221
SIM LogPrimary systemA volume being used by P-VOL has been
suspended.
Path recovery is impossible.
Serious0XDC
SIM LogPrimary systemA volume being used by P-VOL has been
suspended.
A failure has been detected in the primary
system.
Serious1XDC
SIM LogPrimary systemA volume being used by P-VOL has been
suspended.
A failure has been detected in the
secondary system.
Serious2XDC
SIM LogPrimary systemA volume being used by P-VOL has been
suspended.
A pair has been suspended at the
secondary system.
Serious4XDC
SIM LogPrimary systemA volume being used by P-VOL has been
suspended.
A pair has been released at the secondary
system.
Serious5XDC
124 Troubleshooting