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XFS write-cache

/etc/systemd/system/xfs-write-cache.service

[Unit]
Description=Set XFS Write cache to write through

[Service]
Type=oneshot
User=root
Group=root
ExecStart=/usr/lib/systemd/system-sleep/xfs-write-cache
RemainAfterExit=true
StandardOutput=journal

[Install]
WantedBy=multi-user.target

/usr/lib/systemd/system-sleep/xfs-write-cache

#!/bin/sh
echo "write through" | sudo tee /sys/block/sda/queue/write_cache

We put xfs-write-cache executable script in /usr/lib/systemd/system-sleep/ because we want the "write through" setting to be set again after a resume.

Source: https://serverfault.com/questions/980677/xfs-with-no-barrier-mount-option-deprecated

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