16d4acbaca
The 'D' is now capital to clarify pronunciation. DBus service name is kept as '/Tuned' not to break backward compatibility. This will also need update of downstream tests which rely on the specific output strings containing the name. Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>
135 lines
4.5 KiB
Text
135 lines
4.5 KiB
Text
[id="setting-the-disk-scheduler-using-tuned_{context}"]
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= Setting the disk scheduler using TuneD
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This procedure creates and enables a *TuneD* profile that sets a given disk scheduler for selected block devices. The setting persists across system reboots.
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In the following commands and configuration, replace:
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* [replaceable]_device_ with the name of the block device, for example `sdf`
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* [replaceable]_selected-scheduler_ with the disk scheduler that you want to set for the device, for example `bfq`
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.Prerequisites
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// Use an xref if we're inside the performance title or the upstream TuneD manual.
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ifdef::performance-title[]
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:installing-tuned-link: pass:macros[xref:installing-and-enabling-tuned_getting-started-with-tuned[]]
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endif::[]
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ifdef::upstream[]
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:installing-tuned-link: pass:macros[xref:installing-and-enabling-tuned_getting-started-with-tuned[]]
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endif::[]
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// Use a link elsewhere.
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ifndef::performance-title[]
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:installing-tuned-link: pass:macros[https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/monitoring_and_managing_system_status_and_performance/getting-started-with-tuned_monitoring-and-managing-system-status-and-performance#installing-and-enabling-tuned_getting-started-with-tuned]
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endif::[]
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* The `tuned` service is installed and enabled.
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+
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For details, see {installing-tuned-link}.
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.Procedure
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// Use an xref if we're inside the performance title or the upstream TuneD manual.
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ifdef::performance-title[]
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:tuned-profiles-link: pass:macros[xref:tuned-profiles-distributed-with-rhel_getting-started-with-tuned[]]
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endif::[]
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ifdef::upstream[]
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:tuned-profiles-link: pass:macros[xref:tuned-profiles-distributed-with-rhel_getting-started-with-tuned[]]
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endif::[]
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// Use a link elsewhere.
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ifndef::performance-title[]
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:tuned-profiles-link: pass:macros[https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/monitoring_and_managing_system_status_and_performance/getting-started-with-tuned_monitoring-and-managing-system-status-and-performance#tuned-profiles-distributed-with-rhel_getting-started-with-tuned]
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endif::[]
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. Optional: Select an existing *TuneD* profile on which your profile will be based. For a list of available profiles, see {tuned-profiles-link}.
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+
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To see which profile is currently active, use:
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+
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----
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$ tuned-adm active
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----
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. Create a new directory to hold your *TuneD* profile:
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+
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[subs=+quotes]
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----
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# mkdir /etc/tuned/[replaceable]__my-profile__
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----
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. Find the World Wide Name (WWN) identifier of the selected block device:
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+
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[subs=+quotes]
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----
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$ udevadm info --query=property --name=/dev/[replaceable]__device__ | grep WWN=
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ID_WWN=[replaceable]__0x5002538d00000000__
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----
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. Create the [filename]`/etc/tuned/[replaceable]__my-profile__/tuned.conf` configuration file. In the file, set the following options:
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** Optional: Include an existing profile:
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+
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[subs=+quotes]
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----
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[main]
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include=[replaceable]__existing-profile__
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----
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** Set the selected disk scheduler for the device that matches the WWN identifier:
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+
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[subs=+quotes]
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----
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[disk]
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devices_udev_regex=ID_WWN=[replaceable]__0x5002538d00000000__
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elevator=[replaceable]__selected-scheduler__
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----
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+
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To match multiple devices in the [option]`devices_udev_regex` option, enclose the identifiers in parentheses and separate them with vertical bars:
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[subs=+quotes]
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----
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devices_udev_regex=(ID_WWN=[replaceable]__0x5002538d00000000__)|(ID_WWN=[replaceable]__0x1234567800000000__)
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----
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. Enable your profile:
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+
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[subs=+quotes]
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----
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# tuned-adm profile [replaceable]__my-profile__
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----
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. Verify that the TuneD profile is active and applied:
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+
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[subs=+quotes]
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----
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$ tuned-adm active
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Current active profile: [replaceable]_my-profile_
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----
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+
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----
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$ tuned-adm verify
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Verification succeeded, current system settings match the preset profile.
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See TuneD log file ('/var/log/tuned/tuned.log') for details.
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----
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.Additional resources
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// Use an xref if we're inside the performance title or the upstream TuneD manual.
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ifdef::performance-title[]
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:customizing-tuned-link: pass:macros[xref:customizing-tuned-profiles_monitoring-and-managing-system-status-and-performance[]]
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endif::[]
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ifdef::upstream[]
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:customizing-tuned-link: pass:macros[xref:customizing-tuned-profiles_tuned-documentation[]]
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endif::[]
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// Use a link elsewhere.
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ifndef::performance-title[]
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:customizing-tuned-link: pass:macros[https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/monitoring_and_managing_system_status_and_performance/customizing-tuned-profiles_monitoring-and-managing-system-status-and-performance]
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endif::[]
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* For more information on creating a *TuneD* profile, see {customizing-tuned-link}.
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