vDCA550-Objective 1.3-3-Troubleshoot common storage issues

We have discussed lots of thing through out this blue print regarding storage configuration. This topic is expandable and you can not conver it completly.You can learn the issue and how to resolve it with the experience.

However  there are some recommendations. which we do to avoid the storage related issues.

Troubleshooting  iSCSI/FC Storage Display Problems

Some time your ISCSI/FC LUN is not able to display into the vSphere. Following are the guideline to check the issue.

  • Check cable connectivity
  • Check routing settings
  • Check access control configuration (CHAP)
  • For software and dependent hardware iSCSI, check network configuration
  • Rescan your iSCSI initiator.

Troubleshooting Storage Adapters

If your storage adapters experience performance problems, use the esxcli storage san commands to identify the problems.

Use the esxcli storage san commands to obtain and display events and statistics for the adapters. You can analyze the commands’ output to identify adapter problems and to find appropriate solutions

Here is example of an ISCSI adapter.

#esxcli storage san iscsi stats get

vDCA550-Obj-1-3-troubleshootstorageissues-01

Troubleshooting Solid-State Drives

  • Use only unformatted SSDs for virtual flash resource and Virtual SAN configuration.
  • When you install ESXi or use Auto Deploy to provision hosts, you can enable the auto-partitioning boot option to create partitions on your host. You have several options to prevent auto-partitioning from formatting local SSDs as VMFS.you can prevent this by following esxi advance settings autoPartition=TRUE and skipPartitioningSsds=TRUE
  • You can use PSA SATP claim rules to tag SSD devices that are not detected automatically.

Troubleshooting  NFS Problem

Some time attempt to mount a NFS device and it did not mount. Always make sure that the underlying NFS server offers internationalization support. If the server does not, use only ASCII characters.

Troubleshooting  Logfile

When you analyze ESXi host’s /var/log/vmkernel log files, you encounter events or error messages that contain SCSI Sense codes

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