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akiradeveloper / dm-writeboost

Log-structured Caching for Linux
GNU General Public License v2.0
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Problem using dmsetup and writeboost to create device-mapper file #190

Closed allenjhan closed 6 years ago

allenjhan commented 6 years ago

I am currently using DM-writeboost on a virtual machine. The kernel module installs fine.

Last week, I tried using dmsetup with the command

sudo dmsetup create mylv --table "0 `blockdev --getsize /dev/sdb` writeboost /dev/sdb /dev/sdc"

and it worked fine.

Today, I tried it again and it failed with the error

device-mapper: reload ioctl on mylv failed: Input/output error
Command failed

Of course, I remembered to zero the first sector of the cache device. Has anyone ever seen this error while attempting to call dmsetup with DM-writeboost, and do you know what it means?

akiradeveloper commented 6 years ago

@allenjhan No. I think you've made some easy mistakes (e.g. the device doesn't exist)

I recommend you to solve this issue by yourself and you will be able to learn much more about Writeboost and Linux. It should be super easy. The dmesg may help.

allenjhan commented 6 years ago

I tried several things, but got it to work in the end. The problem seems to be a bad USB port on my computer. If I don't use it, and use the other ones, things seem to work fine.

I didn't know about dmesg, so thanks.