68 lines
2.4 KiB
Bash
68 lines
2.4 KiB
Bash
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#!/bin/sh
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###
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# Set SAS and SATA SCT error timeout.
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#
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# SPDX-License-Identifier: CC0-1.0
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###
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###
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# Description
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#
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# Configures SCTERC timeout for all disks, setting it to 7 seconds (70
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# deciseconds) for improved error handling. If SCTERC is unsupported,
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# then Linux I/O timeout and the SCSI error handler (EH) timeouts are
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# increased.
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#
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# SCTERC (SCT Error Recovery Control) allows the disk to limit its
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# internal recovery time, ensuring that it returns an error promptly if
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# the operation cannot be completed, for example due to a bad sector.
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# This prevents the SCSI layer from triggering high-level resets (e.g.,
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# LUN, bus, or host resets) that could lead to data loss or filesystem
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# corruption. If SCTERC is not supported, setting a long "timeout"
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# helps prevent premature EH invocation.
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#
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# In Linux, the "timeout" value is how long the kernel waits for an
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# individual I/O command to complete before declaring it as failed and
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# invoking the SCSI Error Handler (EH). Once EH takes over, its
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# behaviour is governed by the driver implementation. The "eh_timeout"
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# parameter defines how long the EH is allowed to try recovery
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# operations before escalating further or offlining the device.
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#
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# Some SMR (Shingeled Magnetic Recording) type harddisks are especially
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# prone to trigger Linux I/O timeouts, as their internal garbage
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# collection can take several minutes to complete. You may need to
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# increase the fb_timeout on such devices.
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#
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# See the Linux documentation for SCSI error handling at:
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# https://www.kernel.org/doc/Documentation/scsi/scsi_eh.rst
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###
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sct=70 # 70=7 seconds
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sct_timeout=20 # 20 seconds
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sct_eh_timeout=10 # 10 seconds
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fb_timeout=180 # 180 seconds
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fb_eh_timeout=30 # 30 seconds
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for i in /dev/sd[a-z] ; do
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device=$(basename "$i")
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# Attempt to set the SCTERC timeout to 7 seconds
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output=$(smartctl -l scterc,$sct,$sct "$i" 2>&1)
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# Check the output for "SCT Commands not supported"
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if echo "$output" | grep -q "SCT Commands not supported" ; then
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printf "%s: no SCTERC support, using fallback. " "$i"
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echo $fb_timeout > "/sys/block/${device}/device/timeout"
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echo $fb_eh_timeout > "/sys/block/${device}/device/eh_timeout"
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else
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printf "%s: SCTERC set ok. " "$i"
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echo $sct_timeout > "/sys/block/${device}/device/timeout"
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echo $sct_eh_timeout > "/sys/block/${device}/device/eh_timeout"
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fi
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# Show device identification
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smartctl -i "$i" | grep -E "(Device Model|Product:)"
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done
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