wiki.matoken.org

$ git clone https://github.com/pkoutoupis/rapiddisk
$ cd rapiddisk
$ make
$ sudo make install

$ modinfo rapiddisk
filename:       /lib/modules/5.18.0-1-amd64/kernel/drivers/block/rapiddisk.ko
Copyright:      Copyright 2010 - 2022 Petros Koutoupis
version:        8.2.0
description:    RapidDisk is an enhanced RAM disk block device driver.
author:         Petros Koutoupis <petros@petroskoutoupis.com>
license:        GPL
srcversion:     E1B431573C8B09D446D11E3
depends:        
retpoline:      Y
name:           rapiddisk
vermagic:       5.18.0-1-amd64 SMP preempt mod_unload modversions 
parm:           max_sectors: Maximum sectors (in KB) for the request queue. (Default = 127) (int)
parm:           nr_requests: Number of requests at a given time for the request queue. (Default = 128) (int)
parm:           rd_nr: Maximum number of RapidDisk devices to load on insertion. (Default = 0) (int)
parm:           rd_size: Size of each RAM disk (in KB) loaded on insertion. (Default = 0) (int)
parm:           rd_max_nr: Maximum number of RAM Disks. (Default = 128) (int)

$ sudo modprobe -v rapiddisk
insmod /lib/modules/5.18.0-1-amd64/kernel/drivers/block/rapiddisk.ko 
modprobe: ERROR: could not insert 'rapiddisk': Operation not permitted
$ sudo /usr/lib/linux-kbuild-5.18/scripts/sign-file sha256 ~root/MOK.priv ~root/MOK.der /lib/modules/5.18.0-1-amd64/kernel/drivers/block/rapiddisk.ko
$ sudo modprobe -v rapiddisk
insmod /lib/modules/5.18.0-1-amd64/kernel/drivers/block/rapiddisk.ko

RAPIDDISK(1)                                                                                           GENERAL COMMANDS                                                                                           RAPIDDISK(1)

NAME
       rapiddisk - An administration tool to manage the RapidDisk RAM disk devices and RapidDisk-Cache mappings.

SYNOPSIS
       rapiddisk [ -h | -v ] function [ parameters ]

DESCRIPTION
       rapiddisk  is  a  RapidDisk module management tool to manage RapidDisk RAM disk devices. Dynamically create, remove, resize RAM volumes and if desired, map or unmap them as a cache volume to any block device. Access
       those drives locally or export those volumes across an NVMe Target network.

   Options
       -h     Invoke the help menu.

       -v     Display the version number.

   Functions
       -a     Attach RAM disk device (size in MBytes).

       -b     Backend block device absolute path (for cache mapping).

       -c     Input capacity for size or resize of RAM disk device (in MBytes).

       -d     Detach RAM disk device.

       -e     Export a RapidDisk block device as an NVMe Target.

       -f     Erase all data to a specified RapidDisk device (dangerous).

       -H     The host to export / unexport the NVMe Target to / from.

       -i     Define the network interface to enable for NVMe Target exporting. Port must not already exist and interface must not be already enabled.

       -j     Enable JSON formatted output.

       -l     List all attached RAM disk devices.

       -m     Map an RapidDisk device as a caching node to another block device.

       -N     List only enabled NVMe Target ports.

       -n     List RapidDisk enabled NVMe Target exports.

       -P     The port to export / unexport the NVMe Target to / from.

       -p     Define cache policy: write-through (wt), write-around (wa) or writeback (wb) (dangerous) (default: write-through).  Writeback caching is supplied by the dm-writecache kernel module and  is  not  intended  for
              production use as it may result in data loss on hardware/power failure.

       -r     Dynamically grow the size of an existing RapidDisk device.

       -s     Obtain RapidDisk-Cache Mappings statistics.

       -t     Define the NVMe Target port's transfer protocol (i.e. tcp or rdma).

       -u     Unmap a RapidDisk device from another block device.

       -X     Remove the NVMe Target port (must be unused).

       -x     Unexport  a RapidDisk block device from an NVMe Target. To remove export to host or port, only define the host and / or port. Not defining a host or port will result in the block device being removed from the
              NVMe Target subsystem.

   Parameters (if applicable)
       [size] Specify desired size of attaching RAM disk device in MBytes.

       [mode] Write Through (wt) or Write Around (wa) for cache.

EXAMPLE USAGE
       rapiddisk -l

       rapiddisk -l -j

       rapiddisk -a 64

       rapiddisk -d rd2

       rapiddisk -r rd2 -c 128

       rapiddisk -m rd1 -b /dev/sdb

       rapiddisk -m rd1 -b /dev/sdb -p wt

       rapiddisk -m rd3 -b /dev/mapper/rc-wa_sdb -p wb

       rapiddisk -u rc-wt_sdb

       rapiddisk -s rc-wt_sdb

       rapiddisk -f rd2

       rapiddisk -i eth0 -P 1 -t tcp

       rapiddisk -X -P 1

       rapiddisk -e -b rd3 -P 1 -H nqn.host1

       rapiddisk -x -b rd3 -P 1 -H nqn.host1

EXIT STATUS
       rapiddisk returns a zero exit status if no error occurs during operation. A non-zero value is returned on error.

AUTHORS
       Original version: Petros Koutoupis (petros@petroskoutoupis.com)

SEE ALSO
       View the RapidDisk project page: http://www.rapiddisk.org

Linux                                                                                                     Oct 16 2010                                                                                             RAPIDDISK(1)

RAPIDDISK(1)                                                                                           GENERAL COMMANDS                                                                                           RAPIDDISK(1)

NAME
       rapiddiskd - A daemon intended to listen for API requests.

SYNOPSIS
       rapiddiskd [ -h | -v ] [ options ]

DESCRIPTION
       rapiddiskd is a daemon intended to listen for API requests to manage RapidDisk functions.

   Options
       -h     Invoke the help menu.

       -p     Change port to listen on (default: 9118).

       -V     Enable debug messages to stdout (this is ugly)

       -v     Display the version number.

EXAMPLE USAGE
       rapiddiskd -p 8888

       rapiddisk -V

EXIT STATUS
       rapiddisk returns a zero exit status if no error occurs during operation. A non-zero value is returned on error.

AUTHORS
       Original version: Petros Koutoupis (petros@petroskoutoupis.com)

SEE ALSO
       View the RapidDisk project page: http://www.rapiddisk.org

Linux                                                                                                     Sep 27 2020                                                                                             RAPIDDISK(1)

512MBをrd0に割当

$ sudo rapiddisk -a 512
rapiddisk 8.2.0
Copyright 2011 - 2022 Petros Koutoupis

Attached device rd0 of size 512 Mbytes

mount状態のデバイスには割当できない

$ sudo rapiddisk -m rd0 -b /dev/sda
rapiddisk 8.2.0
Copyright 2011 - 2022 Petros Koutoupis

/dev/sda is currently mounted. Please "umount" and retry.

とりあえずフォーマットしてマウント

$ sudo mkfs.ext4 /dev/rd0
$ sudo mount /dev/rd0 /mnt
$ sudo dd if=/dev/zero of=/mnt/hoge bs=1M count=1024
dd: error writing '/mnt/hoge': No space left on device
477+0 records in
476+0 records out
500109312 bytes (500 MB, 477 MiB) copied, 2.0929 s, 239 MB/s

$ make                                                                            
make -C src                                                                                                       
make[1]: Entering directory '/home/matoken/src/rapiddisk/src'                     
cc -c net.c -o net.o                                                                                              
net.c:34:10: fatal error: microhttpd.h: No such file or directory                 
   34 | #include <microhttpd.h>                                                                                   
      |          ^~~~~~~~~~~~~~                                                                                   
compilation terminated.                                                                                           
make[1]: *** [Makefile:58: net.o] Error 1                                                                         
make[1]: Leaving directory '/home/matoken/src/rapiddisk/src'                           
make: *** [Makefile:26: src] Error 2    

$ sudo apt install libmicrohttpd-dev
$ make