75 lines
2.3 KiB
Plaintext
75 lines
2.3 KiB
Plaintext
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# configuration file for dm-cache
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#
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# SPDX-License-Identifier: GPL-3.0-or-later
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# Copyright 2023 Forza <forza@tnonline.net>
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#
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# Linux Cache admin documentation:
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# https://www.kernel.org/doc/html/latest/admin-guide/device-mapper/cache.html
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#
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# Mandatory options are:
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# dmname, cachedev, metadev, origindev
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# The assembled dm-cache device name
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# This will be available in /dev/mapper/<dmname>
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dmname="dmcache1"
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# The device to use as cache. Usually a fast
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# SSad or NVME device
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cachedev="/dev/disk/by-partlabel/cache"
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# A small device used to store dm-cache metadata
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metadev="/dev/disk/by-partlabel/meta"
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# The origin block device. This is the slow device
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# that should be accelerated with dm-cache.
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# DO NOT use a filesystem uuid here, but a device ID.
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# example:
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# origindev="/dev/disk/by-partuuid/ac0ae9b1-8e32-4e33-b641-998bc0298d14"
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# origindev="/dev/disk/by-id/ata-WDC_WD10JFCX-68N6GN0_WD-WX52A60PS33D-part1"
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origindev="/dev/disk/by-partlabel/data"
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# The following section has optional settings to tune the
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# device-mapper options for assembling the cache.
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# These are advanced options. Make sure to read the Linux Cache
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# documentation before changing these.
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# dm-cache requires the origindev size in 512 byte sectors.
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originsize="$(/sbin/blockdev --getsz ${origindev})"
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# Set read-ahead sectors for the mapped device.
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# This does not change the read-ahead for the underlying
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# devices.
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#readahead=256
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# Cache block size in 512 byte sectors.
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# 256 sectors = 128KiB size cache blocks
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#cacheblock=256
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# Write cache mode: writeback, writethrough or passthrough.
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#cachemode="1 writethrough"
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# Migration policy decides when to migrate data to/from cache
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# and origin device.
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#cachepolicy="default"
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# Additional policy arguments.
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#cachepolicyargs="0"
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# 'writethrough' cache (default):
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# Write through caching prohibits cachedev content from being
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# different from origindev content. This mode only accelerates
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# reads, but should allow the origin device to be used without the
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# cache dev after a crash.
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#
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# 'writeback' cache:
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# When write back cache is used. Writes are written to the
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# cachedev first, before being synced in the background to the
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# origindev.
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# If the system crashes, the dm-cache must be assembled again
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# before use to avoid serious filesystem damage.
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# If the cachedev fails, the filesystem can be irrevokably damaged!
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