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To install the emulator:
1) Compile and install the module:
$ make
make -C /lib/modules/3.13.0-24-generic/build M=/tmp/shingle modules
make[1]: Entering directory `/usr/src/linux-headers-3.13.0-24-generic'
CC [M] /tmp/shingle/dm-sadc.o
Building modules, stage 2.
MODPOST 1 modules
CC /tmp/shingle/dm-sadc.mod.o
LD [M] /tmp/shingle/dm-sadc.ko
make[1]: Leaving directory `/usr/src/linux-headers-3.13.0-24-generic'
$ sudo insmod dm-sadc.ko
2) Specify the shingled disk parameters to dm.py script to produce a correct
device mapper table entry. The following example emulates a shingled disk
on top of /dev/sdb, using 10 GiB of its size, with 10 MiB tracks and a band
consisting of 10 tracks. One percent of 10 GiB is used as cache region.
$ ./dm.py /dev/sdb $((10*1024*1024*1024)) $((1024*1024)) 10 1 | sudo dmsetup create sadc
Running this command will produce the following entries in your kernel log:
bio: create slab <bio-1> at 1
device-mapper: sadc: Destructing...
device-mapper: sadc: Constructing...
device-mapper: sadc: Disk size: 10.0 GiB
device-mapper: sadc: Band size: 10.0 MiB
device-mapper: sadc: Band size: 2560 pbas
device-mapper: sadc: Total number of bands: 1024
device-mapper: sadc: Number of cache bands: 10
device-mapper: sadc: Cache size: 100 MiB
device-mapper: sadc: Number of usable bands: 1010
device-mapper: sadc: Usable disk size: 9.86 GiB
device-mapper: sadc: Number of usable pbas: 2585600
device-mapper: sadc: Wasted disk size: 40.0 MiB
3) This will generate a new block device called /dev/mapper/sadc that you can
use as a regular disk, e.g. the following commands format and mount it as
ext4 partition:
$ sudo mkfs.ext4 -b 4096 /dev/mapper/sadc
$ sudo mount /dev/mapper/sadc /mnt
4) To remove the target, you need to make sure it is not used and then run the
following command:
$ sudo dmsetup remove sadc
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