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--- fuss:btrfs [2017/01/31 12:21] – created office
+++ fuss:btrfs [2022/04/19 08:28] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+====== Force SSD Optimizations on Format ======
+Some devices are improperly detected on Linux as being rotational (ie: hard-drive with spinning disks) when, in fact, the device is an SSD (flash type) device. ''mkfs.btrfs'' checks:
+<code>
+/sys/block/DEVICE/queue/rotational
+</code>
+where ''DEVICE'' is a block device (''sda'', ''sdb'', etc...) and if the contents of that file is ''1'', then ''mkfs.btrfs'' considers that the device is rotational and disables SSD features.
+In case ''mkfs.btrfs'' disables SSD features but you are certain that the device is an SSD, you can simply:
+<code bash>
+echo 0 >/sys/block/DEVICE/queue/rotational
+</code>
+where ''DEVICE'' is the block device, in order to make the kernel treat the device as a non-spinning disk.
+After that, you can issue ''mkfs.btrfs'' with your favourite options and ''mkfs.btrfs'' will detect the device as an SSD.