Error recovery control: Difference between revisions

Revision as of 06:08, 29 April 2016

Revision as of 06:16, 29 April 2016

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On disks that fully implement the ATA-8<ref>[http://www.t13.org/documents/UploadedDocuments/docs2007/D1699r4a-ATA8-ACS.pdf AT Attachment 8 - ATA/ATAPI Command Set (ATA8-ACS) ]</ref> standard, the smartctl utility (part of the [http://smartmontools.sourceforge.net smartmontools] package) can be used<ref>[http://cgi.csc.liv.ac.uk/~greg/projects/er c/ Author's description of the original patch to smartctl that implemented that feature]</ref> to control the TLER behavior of many drives by setting the SCT Error Recovery

Control (scterc) parameter:

* Reading the current setting:<pre>

These commands may not work on all HDs:hard disk drives because some manufacturers have changed their desktop drives not to stopinclude the support for the ERC parameter,<ref>{{cite web|url=http://www.spinics.net/lists/raid/msg38964.html|title=Re: md RAID with enterprise-class SATA or SAS drives|work=spinics.net}}</ref> purportedly to force sales of their more expensive RAID/enterprise models.

smartctl -l scterc /dev/sda

SCT Error Recovery Control:

Read: Disabled

Write: Disabled

</pre>

*Changing the setting:<pre>

smartctl -l scterc,200,200 /dev/sda

SCT Error Recovery Control:

Read: 200 (20.0 seconds)

Write: 200 (20.0 seconds)

</pre>

*Disabling TLER (allow unlimited time for recovery, for stand-alone drives not in a RAID array):<pre>

smartctl -l scterc,0,0 /dev/sda

SCT Error Recovery Control set to:

Read: Disabled

Write: Disabled

</pre>

These commands may not work on all HDs: some manufacturers have changed their desktop drives to stop support for the ERC parameter,<ref>{{cite web|url=http://www.spinics.net/lists/raid/msg38964.html|title=Re: md RAID with enterprise-class SATA or SAS drives|work=spinics.net}}</ref> purportedly to force sales of their more expensive RAID/enterprise models.

==RAID controllers==