Loading

×Sorry to interrupt
CSS Error

Refresh

Cookie Preference Center

General Information on cookies

When you visit our website, we use cookies to ensure that we give you the best experience. This information does not usually directly identify you, but it can give you a more personalized web experience. Because we respect your right to privacy, you can choose not to allow some types of cookies by clicking on the different category headings to find out more and change your settings. However, blocking some types of cookies may impact your experience on the site and the services we are able to offer. Further information can be found in our

Cookie Policy.

Strictly Necessary

Strictly Necessary

Always Active

Strictly Necessary

Strictly necessary cookies are always enabled since they are essential for our website to function. They enable core functionality such as security, network management, and website accessibility. You can set your browser to block or alert you about these cookies, but this may affect how the website functions. For more information please visit www.aboutcookies.org or www.allaboutcookies.org.

Cookie Details‎

Performance

Performance

Performance

Performance cookies are used to analyze the user experience to improve our website by collecting and reporting information on how you use it. They allow us to know which pages are the most and least popular, see how visitors move around the site, optimize our website and make it easier to navigate.

Cookie Details‎

Please confirm your settings by refreshing the page.

Functional

Functional

Functional

Functional cookies help us keep track of your past browsing choices so we can improve usability and customize your experience. These cookies enable the website to remember your preferred settings, language preferences, location and other customizable elements such as font or text size. If you do not allow these cookies, then some or all of these services may not function properly.

Cookie Details‎

Advertising

Advertising

Advertising

Advertising cookies are used to send you relevant advertising and promotional information. They may be set through our site by third parties to build a profile of your interests and show you relevant advertisements on other sites. These cookies do not directly store personal information, but their function is based on uniquely identifying your browser and internet device.

Cookie Details‎

Advertising Cookies

Consent Leg.Interest

Select All Vendors

Select All Vendors

Select All Hosts

Select All

Clear Filters

Information storage and access

Apply

Confirm My Choices Reject All Allow All

My Subscriptions

Loading

Knowledge Base

Troubleshooting Storage I/O Control (1022091)

Last Updated: 3/20/2024Categories: TroubleshootingTotal Views: 20804Language:
Chinese (Simplified)JapaneseEnglish

1 like this article

Subscribe to get an email
newsletter with new updates

1 people found this helpful Please provide article feedback:

Symptoms

Storage I/O Control (SIOC) is not performing as expected.

I/O from virtual machines does not get prioritized under congestion circumstances, or it gets prioritized when there is no real congestion.

SIOC rules are intermittently applied to virtual machines on the same host.

Purpose

This article provides information on determining if SIOC has been correctly configured and provides steps to enable logging.

Resolution

Storage I/O Control (SIOC) is used to control the I/O usage of a virtual machine and to gradually enforce the predefined I/O share levels. SIOC is supported on Fibre Channel and iSCSI connected storage in ESX/ESXi 4.1 and 5.0. With ESXi 5.0 support for NFS with SIOC was also added. Datastores with multiple extents or Raw Device Mapping (RDM) are currently not supported. For more information, see the Managing Storage I/O Resources section in the vSphere 4.1 Resource Management Guide or vSphere 5.0 Resource Management Guide.

Notes:

Before using SIOC on datastores that are backed by arrays with automated storage tiering capabilities, check the VMware Storage/SAN Compatibility Guide to ensure that your automated tiered storage array is certified to be compatible with SIOC.

Before enabling SIOC, ensure that datastores are managed by a single vCenter Server.

Note: Storage I/O Control (SIOC) requires Enterprise Plus licensing. Without this license, the option to enable SIOC is grayed out. For more information, see Compare vSphere Editions.

Enabling Storage I/O Control

To enable SIOC:

Select a datastore in the vSphere Client inventory and click the Configuration tab.

Click Properties.

Under Storage I/O Control, select Enabled.

Click Close.

Note: This setting is specific to the datastore and not to the host.

If you experience problems with SIOC or if the number of hosts connected to the datastore has changed since enabling SIOC:

Disable SIOC and save the changes by clicking OK.

Enable SIOC and save the changes.

Determining if the threshold value has been modified

To determine if the threshold value has been modified:

Select a datastore in the vSphere Client inventory and click the Configuration tab.

Click Properties.

Under Storage I/O Control, click Advanced.

Check if the value is 30ms. If it is not 30, reset it to the default value of 30.

Ensuring virtual machines have disk shares assigned according to their importance

By default, all virtual machines have the same number of shares and IOPS limit. IOPS are the number of I/O operations per second. By default, IOPS are unlimited. If these defaults are not changed, then I/O control does not prioritize virtual machines.

To see the shares of all the virtual machines on the cluster, choose the cluster, click Resource Allocation, then click Storage.

To change the vDisk shares and limit:

Choose a virtual machine in the vSphere Client inventory.

Click the Summary tab and click Edit Settings.

Click the Resources tab and click Disk.

Choose a virtual hard disk from the list and click the Share column to select the relative amount of shares to allocate to the virtual machine (Low, Normal, or High).

You can also click Custom and enter a user-defined share value.

Click the Limit - IOPS column and enter the upper limit of storage resources to allocate to the virtual machine.

Click OK.

Note: The above process is used to set the resource consumption limits of individual vdisks in a virtual machine even when SIOC is not enabled. These settings are specific to the individual guest, and not the host, although they are used by SIOC.

Enabling and disabling SIOC logging on the host

These logs are used for troubleshooting purposes. If you are sending the support logs to VMware, enable SIOC logging before collecting the logs. VMware recommends that you disable logging after the troubleshooting activity is complete.

To enable logging:

Click Host > Configuration.

In the left pane, click Software and then click Advanced Settings.

In the Misc section, select the Misc.SIOControlLogLevel parameter.

Set the value to 7 for complete logging.

For example:

Min value: 0 (no logging)
Max value: 7

After changing the log level, you see these changes logged in the/var/log/vmkernel logs:

May 27 07:41:10 wdc-tse-h53 vmkernel: 76:14:16:03.334 cpu7:4110)Config: 297: "SIOControlLoglevel" = 1, Old Value: 0, (Status: 0x0)

Perform the action that is failing or repeat the procedure to replicate the observed issue.

To disable logging:

Click Host > Configuration.

In the left pane, click Software and then click Advanced Settings.

Set the Misc.SIOControlLogLevel value to 0.

After changing the log level, you see these changes logged in the /var/log/vmkernel logs.

May 27 07:41:31 wdc-tse-h53 vmkernel: 76:14:16:24.521 cpu4:4111)Config: 297: "SIOControlLoglevel" = 0, Old Value: 1, (Status: 0x0)

Note: SIOC log files are saved in /var/log/messages. In ESXi 5.0 or later versions, the SIOC log files are saved in /var/log/storagerm.log.

Note: Setting the value for log level to "0" disabling debug logging but keeps Info. logging.

Run this command to stop and start SIOC on ESX;

/etc/init.d/vmware-late {start|stop|status|restart}

Run this command to stop and start SIOC on ESXi:

/etc/init.d/storageRM {start|stop|status|restart}

Related Information

For more information, see the Managing Storage I/O Resources section in the vSphere 4.1 Resource Management Guide or vSphere 5.0 Resource Management Guide.

Storage I/O Control のトラブルシューティング
Storage I/O Control 故障排除

Detectable by VMware SkylineTM

Actions

Copy

link to clipboard
copied!

Print

Language:
Chinese (Simplified)JapaneseEnglish

Attachments

Additional Resources

KB
•
End Of General Availability of the Free vSphere Hypervisor (ESXi 7.x and 8.x) (2107518)

KB
•
Download and Install VMware Fusion (2014097)

Results 1-2 of 2

Ask The Community

Get answers quickly from VMware experts in the community

Post Subject

CONTINUE IN COMMUNITIES

Related Products:

VMware vSphere ESXi

VMware ESX Server

Related Versions:

VMware vSphere ESXi 6.0

VMware vSphere ESXi 5.5

VMware vSphere ESXi 5.1

VMware vSphere ESXi 5.0

VMware ESXi 4.1.x Installable

VMware ESXi 4.1.x Embedded

VMware ESX 4.1.x

Take Our Survey

Support Assistant