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Tuned sets seagate EPC settings aggressively #676

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Firstyear opened this issue Aug 19, 2024 · 0 comments
Open

Tuned sets seagate EPC settings aggressively #676

Firstyear opened this issue Aug 19, 2024 · 0 comments

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@Firstyear
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Tuned when enabled sets seagate EPC settings too aggressively

/dev/sg1 - ST18000NM000J-2TV103 - ZR5ER3PJ - SN04 - ATA


===EPC Settings===
	* = timer is enabled
	C column = Changeable
	S column = Savable
	All times are in 100 milliseconds

Name       Current Timer Default Timer Saved Timer   Recovery Time C S
Idle A     *1            *1            *1            1             Y Y
Idle B     *1200         *1200         *1200         4             Y Y
Idle C      0             6000          6000         20            Y Y
Standby Z  *100           9000          9000         110           Y Y

This causes the heads to unload frequently, increasing my head cycle count by a few thousand before I caught the issue.

The defaults should be left alone here as these settings cause high IO stalls to occur.

/dev/sg1 - ST18000NM000J-2TV103 - ZR5ER3PJ - SN04 - ATA


===EPC Settings===
	* = timer is enabled
	C column = Changeable
	S column = Savable
	All times are in 100 milliseconds

Name       Current Timer Default Timer Saved Timer   Recovery Time C S
Idle A     *1            *1            *1            1             Y Y
Idle B     *1200         *1200         *1200         4             Y Y
Idle C     *6000          6000         *6000         20            Y Y
Standby Z  *9000          9000         *9000         110           Y Y

Tuned profile in use is virt-host

tuned-2.10.0-150400.19.10.noarch, opensuse 15.5

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