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Tunes options for SCSI hosts.
The plug-in sets Aggressive Link Power Management (ALPM) to the value specified
by the [option]`alpm` option. The option takes one of four values:
`min_power`, `med_power_with_dipm`, `medium_power` and `max_performance`.
NOTE: ALPM is only available on SATA controllers that use the Advanced
Host Controller Interface (AHCI).
.ALPM setting when extended periods of idle time are expected
====
----
[scsi_host]
alpm=med_power_with_dipm
----
====
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z(SCSIHostPlugin._hardware_events_callbackc s t t| ��||� d S r )r r �_added_device_apply_tuning�r �instanceZ device_namer r r r$ @ s z)SCSIHostPlugin._added_device_apply_tuningc s t t| ��||� d S r )r r � _removed_device_unapply_tuningr% r r r r' C s z-SCSIHostPlugin._removed_device_unapply_tuningc C s dd iS )N�alpmr )r r r r �_get_config_optionsF s �z"SCSIHostPlugin._get_config_optionsc C s d|_ d|_d S )NTF)Z_has_static_tuningZ_has_dynamic_tuning�r r& r r r �_instance_initL s z SCSIHostPlugin._instance_initc C s d S r r r* r r r �_instance_cleanupP s z SCSIHostPlugin._instance_cleanupc C s t j�dt|�d�S )N�/sys/class/scsi_host/Z link_power_management_policy��os�path�join�strr r r r �_get_alpm_policy_fileS s z$SCSIHostPlugin._get_alpm_policy_filec C s t j�dt|�d�S )Nr- Z
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