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--- storage:smr [2024/02/14 14:28] – [How to format 8TB SMR Drive] Jan Forman
+++ storage:smr [2024/02/21 08:47] (current) – [Shingled magnetic recording (SMR)] Jan Forman
@@ Line 1: / Line 1: @@
 ===== Shingled magnetic recording (SMR) =====
-Acceptable storage systems: F2FS, exFAT, CEPH, RAID1\\
+Acceptable storage systems: **F2FS, exFAT, CEPH, RAID1**\\
 Unacceptable: RAID 5 etc, NTFS, Ext4, ...
@@ Line 15: / Line 15: @@
 mount -t f2fs -onoinline_data,discard,noatime,flush_merge,no_heap,extent_cache,noacl,active_logs=2 /dev/sda1 /mnt
 </code>
+==== Timeout corrections for SMR drive ====
+<code>
+#!/bin/bash
+# source:
+# https://www.reddit.com/r/linuxquestions/comments/lhl03r/ext4_or_btrfs_filesystem_on_smr_drive/
+# https://unix.stackexchange.com/questions/541463/how-to-prevent-disk-i-o-timeouts-which-cause-disks-to-disconnect-and-data-corrup
+smr_fix() {
+    DEVICE=`echo "$1" | cut -f3 -d/`
+    #echo $DEVICE
+    echo 3600 > /sys/block/$DEVICE/device/timeout
+    echo 3600 > /sys/block/$DEVICE/device/eh_timeout
+    echo none > /sys/block/$DEVICE/queue/scheduler
+    echo 1 > /sys/block/$DEVICE/device/queue_depth
+    echo 4 > /sys/block/$DEVICE/queue/nr_requests
+}
+drives=`ls /dev/sd*[a-z]`
+for path in $drives
+do
+    # model=`hdparm -i "$path" | grep -oe 'Model=[^,]*' | cut -f2 -d=`
+    # model=`hdparm -I "$path" | grep Model\ Number: | cut -f2 -d: | sed 's/ //g'`
+    model=`smartctl -i "$path" | grep -Ee 'Product|Device Model' | cut -f2 -d: | sed 's/ //g'`
+    case "$model" in
+        ST4000LM024-2AN17V)
+            smr=1
+            ;;
+        ST5000LM000-2AN170)
+            smr=1
+            ;;
+        *)
+            smr=0
+            ;;
+    esac
+    # echo "$path = $model = smr: $smr"
+    if [ $smr -eq 1 ]
+    then
+        echo "SMR drive $model @ $path"
+        smr_fix "$path"
+    fi
+done
+</code>

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