Disk reports predicted failure event
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A predictive failure alert was reported for disk 1c.xx.xx in NetApp cluster node Cluster-02. The disk reported a predicted failure event. If a matching spare disk is available, rapid RAID recovery will begin by copying the data from the pre-failed disk to the spare. If no spares are available, the disk will eventually fail and cause the RAID group to degrade until a spare is available to reconstruct the data. Proactive assignment of a partner node's spare disk is recommended.
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![Which would show the status 'prefail' against the disk reporting disk.ioRecoveredError scsi
errors. If it’s so, then only 2 things can happen:
1) If there is a matching spare disk assigned on that Node :
It will be automatically selected for Rapid RAID Recovery. In this process, the prefailed disk will be
copied to the spare. At the end of the copy process, the prefailed disk is removed from the RAID
configuration. The node will spin that disk down, mark it as `broken', so that it can be removed from
the shelf.
As shown in the following output: [Rapid RAID Recovery has begun]
data 1.xx.xx 0 SAS 10000 1.63TB 1.64TB (prefail, copy in progress) = disk reporting error
data 1.xx.xx 0 SAS 10000 1.63TB 1.64TB (2 % copied) = new spare
2) If there are no spares on that Node:
Disk will eventually fail and the raid-group will go in a degraded state. Once the suitable spare disk is
available, the contents of the disk being removed (broken state) will be reconstructed onto that
spare disk, until that happens, RG will remain in degraded state and raid-group performance could
see latency issues depending upon the raid-group disk utilization %.
Not an ideal situation;
Proactive action: Check if you have matching spare on the partner node if so then assign it to the
failed-disk node and hopefully data would be copied to new disk before it actually fails.
ashwinwriter@gmail.com
May, 2019](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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The document discusses troubleshooting a SnapDiff performance issue. Key factors that can affect SnapDiff throughput include hardware resources, Data ONTAP version, disk I/O latency, number of files in volumes, parallel SnapDiff sessions, and overlapping backup jobs. Symptoms of timeouts between ONTAP and the media agent during the indexing phase suggest the indexing is taking too long. The document provides workarounds like skipping cataloging and running it later, and using live browse for restores if needed before investigation is complete.
Volume level restore fails with error transient snapshot copy is not supported
A volume level restore failed with an error message indicating that a transient snapshot was not supported for the operation. The error occurred because the snapshot being used was a temporary one created during a SnapVault transfer where deduplication was enabled, making it an invalid snapshot. To resolve it, ensure the snapshot is a valid Snapmirror base snapshot without special characters in the name.
OCUM shows ONTAP cluster health degraded
The document discusses a degraded cluster health status shown in OCUM after adding a cDOT ONTAP controller. While the node pairing status was good, the cluster health showed as degraded. This was because OCUM only marks cluster health as OK after subsystem checks return OK, and one subsystem here showed as degraded, causing the overall cluster health to display as degraded. The solution is to ensure the cluster show and system health subsystem show both return OK.
NDMPCOPY lun from 7-mode NetApp to cDOT
The document describes how to copy archived SQL database LUNs from a 7-mode SnapVault snapshot to a cDOT SAN volume using NDMPCOPY in two phases. Phase 1 uses NDMPCOPY to transfer the LUN from the 7-mode snapshot to the cDOT destination volume. Phase 2 presents the copied LUN to the SQL box by mapping, rescaning disks, and bringing the LUN online so the databases can be retrieved.
Latency in storage
This document discusses components that can contribute to latency in an IT infrastructure, with a focus on storage latency. It identifies potential sources of latency including applications, hosts, virtual machines, networks, and storage components. It recommends commands like 'qos statistics volume performance show' and tools like OCUM/OPM to analyze latency across clustered Data ONTAP components and identify bottlenecks. The document aims to help storage administrators troubleshoot latency issues by examining statistics from different parts of the infrastructure to pinpoint the root cause.
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Disk reports predicted failure event
- 1. Recovered error predictive failure alert Following error is reported in the NetApp ONTAP cluster node event log: MM/DD/YYYY HH:MM:SS Cluster-02 ERROR disk.ioRecoveredError.pfa: Recovered error predictive failure alert on disk 1c.xx.xx: op 0x2a:b1576e00:0200 sector 0 SCSI: recovered error - Disk reports predicted failure event (1 5d 0 32) Enclosure # : 1 SMART ASC # : 5D Connector ID # : 0 SMART ASCQ # : 32 Event log identifier: disk.ioRecoveredError.pfa Severity: ERROR Description: This event is emitted when a disk determines that it will fail shortly. This occurs when a threshold internal to the disk indicates that a failure is imminent. Next step: As the ‘Node-name’ is clearly indicated in the error, along with the physical disk details. You can simply run: Either: cluster::> aggregate show-status –node <node-name> or, cluster::> node run -node cluster-0x cluster-01> aggr status -r
- 2. Which would show the status 'prefail' against the disk reporting disk.ioRecoveredError scsi errors. If it’s so, then only 2 things can happen: 1) If there is a matching spare disk assigned on that Node : It will be automatically selected for Rapid RAID Recovery. In this process, the prefailed disk will be copied to the spare. At the end of the copy process, the prefailed disk is removed from the RAID configuration. The node will spin that disk down, mark it as `broken', so that it can be removed from the shelf. As shown in the following output: [Rapid RAID Recovery has begun] data 1.xx.xx 0 SAS 10000 1.63TB 1.64TB (prefail, copy in progress) = disk reporting error data 1.xx.xx 0 SAS 10000 1.63TB 1.64TB (2 % copied) = new spare 2) If there are no spares on that Node: Disk will eventually fail and the raid-group will go in a degraded state. Once the suitable spare disk is available, the contents of the disk being removed (broken state) will be reconstructed onto that spare disk, until that happens, RG will remain in degraded state and raid-group performance could see latency issues depending upon the raid-group disk utilization %. Not an ideal situation; Proactive action: Check if you have matching spare on the partner node if so then assign it to the failed-disk node and hopefully data would be copied to new disk before it actually fails. ashwinwriter@gmail.com May, 2019