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1answer
464 views

After increasing chunksize in an LVM cache, files are no longer promoted to the cache

After running into issues with running out of kernel memory, I increased the chunksize of my lvmcache from the default (which I believe was 64k) to a much higher 8M. After this change, blocks do not ...
4
votes
2answers
5k views

What's the difference between lvmcache and dm-cache?

Recently I found article mentioning that recently dm-cache significantly improved in linux. I also found that in userspace you see it as lvmcache. And it's quite confusing for me. I thought that LVM ...
1
vote
1answer
3k views

device-mapper: reload ioctl on cache1 failed: Device or resource busy

When I run the below command while setting up dm-cache on my CentOS system, I receive the error: device-mapper: reload ioctl on cache1 failed: Device or resource busy Command failed Command is: ...
1
vote
0answers
35 views

Which is the correct dm-cache version

I am trying to install dm-cache on my CentOS machine. Which dm-cache version should I use. I read on wikipedia as below: Another dm-cache project with similar goals was announced by Eric Van ...
1
vote
0answers
198 views

device-mapper error while setup of dm-cache

I am trying to setup dmcache using the tutorial https://wiki.mikejung.biz/Dmcache When I run the command `dmsetup create home-cached --table '0 976771120 cache /dev/mapper/ssd-metadata /dev/mapper/...
4
votes
0answers
330 views

How to cache block devices (for device mapper)?

problem / observed effect It seems that the page cache ignores block devices which are not opened. And worse: Reads from device mapper (DM) devices which use a cached device are not cached at all (...