High disk utilization leading to excessive latency
- Views:
- 1,594
- Visibility:
- Public
- Votes:
- 0
- Category:
- aff-series
- Specialty:
- hw
- Last Updated:
- 6/30/2021, 6:15:17 AM
Applies to
- AFF8080
- ONTAP 9.5P7
- Disk X356_TPM4V3T8AME
Issue
- Multiple recovered errors reported by the disk
Mon Aug 17 17:13:12 CEST [node1: slifc_intrd: scsi.cmd.checkCondition:error]: Disk device switch1:7.126L523: Check Condition: CDB 0x88:0000000170d2d968:00000048: Sense Data SCSI:recovered error - (0x1 - 0x18 0x0 0x0)(81).
Mon Aug 17 17:13:12 CEST [node1: disk_server_0: disk.ioRecoveredError.retry:info]: Recovered error on disk switch1:7.126L523: op 0x88:0000000170d2d968:00000048 sector 6187833728 SCSI:recovered error - Disk used internal retry algorithm to obtain data (1 18 0 0) (81) Disk switch1:7.126L523 Shelf 15 Bay 22 [NETAPP X356_TPM4V3T8AME NA01] S/N [XXXXXXXXXXXX] UID [58XXXXE:20YYYYC:00000000:00000000:00000000:00000000:00000000:00000000:00000000:00000000]
- Output of
qos statistics volume latency show
shows highest value underDisk
column
Example:
cluster::> qos statistics volume latency show
Workload ID Latency Network Cluster Data Disk QoS NVRAM Cloud FlexCache SM Sync
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
vol1 - 100ms 2ms 2ms 0ms 95ms 1ms 0ms 0ms 0ms 0ms
-total- - 100ms 2ms 2ms 0ms 95ms 1ms 0ms 0ms 0ms 0ms