#Linux wipefs install#
#Linux wipefs drivers#

But for RAID arrays I typically let it go full blast on first initialization, because I don't like relying on ext4lazyinit on a RAID array-it can take days at its reduced rate, and affect RAID performance that whole time! Getting stats To avoid the initialization when making the filesystem, you can omit the -E option entirely. To actually use the device, I formatted it and mounted it to /mnt: $ sudo mkfs.ext4 -E lazy_itable_init=0,lazy_journal_init=0 /dev/bcache0 The UUID in the echo command above comes from the 'Set UUID' output from the make-bcache -C command earlier. I recompiled the kernel and copied my updated kernel to the Pi, then rebooted.Īt this point, I could see the bcache0 device was working: :~ $ lsblkīut if I checked on the status of the cache, it said there was no cache: :~ $ cat /sys/block/bcache0/bcache/stateĪttaching the SSD cache to the backing deviceįinally, it's time to attach the SSD cache to the backing device: $ sudo su # switch to the root user > Multiple devices driver support (RAID and LVM)

#Linux wipefs drivers#

I cross-compiled the Raspberry Pi Linux kernel, and when I did it, during the menuconfig portion, I selected the following option: > Device Drivers Then I tried to look in /sys/block/md0/bcache/ so I could attach the cache to the backing device, but I realized bcache isn't loaded into the default Raspberry Pi OS kernel.

#Linux wipefs install#

I then installed bcache-tools: $ sudo apt-get install bcache-toolsĪnd used make-bcache to create the backing and cache devices: $ sudo make-bcache -B /dev/md0 I created a RAID5 array with mdadm for the three hard drives, and had the raid device /dev/md0. In my case, I have three SATA hard drives: /dev/sda, /dev/sdb, and /dev/sdc.

Getting bcacheīcache is sometimes used on Linux devices to allow a more efficient SSD cache to run in front of a single or multiple slower hard drives-typically in a storage array. In it, I'm going to document how I set up bcache on a Raspberry Pi, so I could use an SSD as a cache in front of a RAID array. This is a simple guide, part of a series I'll call 'How-To Guide Without Ads'.