The following SNMPs rules are followed:  Important:  To receive traps from I/O Priority Manager (IOPM), set the IOPM to manage  SNMP by issuing the following command: The DS8880 can trigger two specific SNMP trap alerts that relate to the thin provisioning  feature. The trap is sent out when certain extent pool capacity thresholds are reached, which  causes a change in the extent status attribute. A trap is sent under the following conditions: Example 14-21 shows an example of generated event trap 221. 466  IBM DS8880 Architecture and Implementation Example 14-21 Trap 221: Space-efficient repository or over-provisioned volume reached a warning  Space Efficient Repository or Over-provisioned Volume has reached a warning  watermark Unit: Mnf Type-Mod SerialNm IBM 2107-981 75-ZA571 Volume Type: repository  Reason Code: 1 Extent Pool ID: f2 Percentage Full: 100% GLYPH<SM590000> ESE volumes are configured in the extent pool. GLYPH<SM590000> The extent status is not zero (available space is already below threshold) when the first  extent space-efficient (ESE) volume is configured. GLYPH<SM590000> The SNMP message 224 is reported when a rank enters saturation or every eight hours if  the rank is in saturation. The message identifies the rank and SFI. See Example 14-20. GLYPH<SM590000> The rank exits the saturation state if it is not in saturation for three of five consecutive  1-minute samples.  GLYPH<SM590000> The rank enters the saturation state if it is in saturation for five consecutive 1-minute  samples. GLYPH<SM590000> Up to eight SNMP traps for each SFI server in a 24-hour period (maximum: 16 for each 24  hours for each SFI). Example 14-20 Trap 224: Rank saturation status changed Rank Saturated  UNIT: Mnf Type-Mod SerialNm IBM 2107-981 75-ZA571  Rank ID: R21  Saturation Status: 0  chsi -iopmmode managesnmp <Storage_Image> 14.2.4 Thin provisioning SNMP