Cannot split clone snapcenter 4.3
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The document discusses an error when attempting to perform a SQL backup clone using SnapCenter 4.3 on a NetApp cDOT storage system using iSCSI. The error references SMB even though iSCSI was being used, because the SnapCenter storage connections were using the cluster management LIF instead of the data SVM management LIF, which is required for SAN protocols like iSCSI. The solution is to add the data SVM directly in SnapCenter using the SVM management LIF.
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A SAN provides block-level storage to clients that they can then use to build their own file systems, similar to a real estate provider giving a plot of land. A NAS provides a complete file system to clients similar to a real estate agent providing a ready-made home, with the NAS appearing as a file server and the SAN appearing as a raw disk to the client operating system. The key difference is that a SAN provides raw disks while a NAS provides a complete file system.
Steps to identify ONTAP latency related issues
The document provides steps to identify and understand latency issues on a NetApp ONTAP system. It analyzes sysstat output showing CPU utilization across various domains. While overall CPU usage is high at 97%, no single domain is fully utilized, indicating CPU is not the root cause of latency. It recommends investigating service level latency for specific LUNs, volumes, or protocols. Using ONTAP QoS commands, it identifies disk latency of 3ms on one aggregate which is within normal limits and not likely the root cause. The aggregate is 89% full which is also not yet concerning given its flash composition.
SnapDiff
SnapDiff is NetApp's proprietary file differencing engine that identifies files changed between snapshots. It compares block-level changes rather than traversing the entire file system, improving backup performance. The SnapDiff API allows backup applications to integrate with SnapDiff. SnapDiff performance is measured in files processed per hour and is impacted by very large or deeply nested directory structures rather than total storage size.
SnapDiff process flow chart
The SnapDiff process flowchart first takes a baseline backup snapshot of a volume. Next, it takes an incremental snapshot once it has the required information. It then begins the SnapDiff process to compare the snapshots and backup changed data.
SnapDiff performance issue
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.
Disk reports predicted failure event
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.
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.
NVRAM vs NVMEM
NVRAM is a separate DIMM from main memory, while NVMEM uses part of the main memory and is not a separate DIMM. The document provides examples of hardware showing NVRAM as a separate 4GB DIMM, while NVMEM on a filer uses 2.4GB of the total 20GB main memory. It clarifies the hardware difference between NVRAM using a separate DIMM and NVMEM utilizing space within main memory.
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