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=== ZFS ===
The [[ZFS|ZFS filesystem]] was written to immediately write data to a sector that reports as bad or takes an excessively long time to read (such as non-TLER drives); this will usually force an immediate sector remap on a weak sector in most drives.
===RAID controllers===▼
Disconnect timeout values for different hardware [[Disk array controller|RAID controllers]] may vary between vendors; thus, TLER should trigger before the controller times out the drive. For example, 3ware 9650SE uses 20 seconds as the timeout,<ref>{{cite web|url=http://kb.lsi.com/KnowledgebaseArticle15639.aspx|archiveurl=https://web.archive.org/web/20120203053819/http://kb.lsi.com/KnowledgebaseArticle15639.aspx|title=User Guide for 9650SE 9690SA from 9.5.2 Complete Codeset|archivedate=3 February 2012|work=lsi.com|accessdate=10 June 2015}}</ref> while for the LSI Logic used in IBM x-series it is 10 seconds.<ref>Available in BIOS Raid Config Utility > Advanced Device Properties</ref>▼
Widely available [[Intel Rapid Storage Technology|Intel Matrix RAID / Intel Rapid Storage Technology]], embedded in [[Intel]] server motherboards and modern desktop motherboards, is a pseudo-hardware controller, not a true hardware RAID controller.▼
===Software RAID===▼
Linux [[mdadm]] simply holds and lets the drive complete its recovery – however, the default command timeout for the SCSI Disk layer (/sys/block/sd?/device/timeout) is 30 seconds,<ref>{{cite web|url=https://github.com/torvalds/linux/blob/master/drivers/scsi/sd.h#LC12|title=linux/sd.h at master · torvalds/linux · GitHub|work=GitHub}}</ref> after which it will attempt to reset the drive, and if that fails, put the drive offline.<ref>{{cite web|url=https://www.kernel.org/doc/html/v5.9/scsi/scsi_eh.html|title= Linux SCSI Subsystem: SCSI EH|work=kernel.org}}</ref>▼
== Western Digital Time Limit Error Recovery utility ==
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Controlling the TLER behavior through the {{Mono|smartctl}} utility may not work on all hard disk drives because some manufacturers have changed their desktop drives not to include 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><ref>{{cite web|url=http://knowledge.seagate.com/articles/en_US/FAQ/203991en|title=Seagate FAQ: What is Error Recovery Control?|work=seagate.com}}</ref> purportedly to force sales of their more expensive RAID/enterprise models.{{Citation needed|date=April 2016}}
▲==RAID controllers==
▲Disconnect timeout values for different hardware [[Disk array controller|RAID controllers]] may vary between vendors; thus, TLER should trigger before the controller times out the drive. For example, 3ware 9650SE uses 20 seconds as the timeout,<ref>{{cite web|url=http://kb.lsi.com/KnowledgebaseArticle15639.aspx|archiveurl=https://web.archive.org/web/20120203053819/http://kb.lsi.com/KnowledgebaseArticle15639.aspx|title=User Guide for 9650SE 9690SA from 9.5.2 Complete Codeset|archivedate=3 February 2012|work=lsi.com|accessdate=10 June 2015}}</ref> while for the LSI Logic used in IBM x-series it is 10 seconds.<ref>Available in BIOS Raid Config Utility > Advanced Device Properties</ref>
▲Widely available [[Intel Rapid Storage Technology|Intel Matrix RAID / Intel Rapid Storage Technology]], embedded in [[Intel]] server motherboards and modern desktop motherboards, is a pseudo-hardware controller, not a true hardware RAID controller.
▲==Software RAID==
▲Linux [[mdadm]] simply holds and lets the drive complete its recovery – however, the default command timeout for the SCSI Disk layer (/sys/block/sd?/device/timeout) is 30 seconds,<ref>{{cite web|url=https://github.com/torvalds/linux/blob/master/drivers/scsi/sd.h#LC12|title=linux/sd.h at master · torvalds/linux · GitHub|work=GitHub}}</ref> after which it will attempt to reset the drive, and if that fails, put the drive offline.<ref>{{cite web|url=https://www.kernel.org/doc/html/v5.9/scsi/scsi_eh.html|title= Linux SCSI Subsystem: SCSI EH|work=kernel.org}}</ref>
==References==
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