LVM cache does not give any performance enhancement
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I'm using Ubuntu 16.04.4 and it's running on a VM.
The disk that has the origin data has an I/O limit on 1MB/s and disk for cache has no limit.
I have followed the guide at fibervillage
to create the LVM and succeeded without errors, with the modification to cachemode writeback, and I also did try writethrough just to try.
When the LV is without cache I got the expected behavior with 1MB transfer rate, But when I added the cahepool to the origin LV I do not see any performance enhancement at all. But creating a LV on the same disk were the cache pool is I get way faster transfer rate. I mounted all volumes in /etc/fstab with sync,dirsync options to avoid any other caching.
lvm cache
asked Mar 28 at 15:09
Jocke
7218
add a comment |Â
up vote
0
down vote
favorite
I'm using Ubuntu 16.04.4 and it's running on a VM.
The disk that has the origin data has an I/O limit on 1MB/s and disk for cache has no limit.
I have followed the guide at fibervillage
to create the LVM and succeeded without errors, with the modification to cachemode writeback, and I also did try writethrough just to try.
When the LV is without cache I got the expected behavior with 1MB transfer rate, But when I added the cahepool to the origin LV I do not see any performance enhancement at all. But creating a LV on the same disk were the cache pool is I get way faster transfer rate. I mounted all volumes in /etc/fstab with sync,dirsync options to avoid any other caching.
lvm cache
asked Mar 28 at 15:09
Jocke
7218
Maybe you are using kernel version before 4.12? Take a look at this article, performance improves a lot since Linux kernel 4.12.
– cyfdecyf
Jul 30 at 5:09
add a comment |Â
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I'm using Ubuntu 16.04.4 and it's running on a VM.
The disk that has the origin data has an I/O limit on 1MB/s and disk for cache has no limit.
I have followed the guide at fibervillage
to create the LVM and succeeded without errors, with the modification to cachemode writeback, and I also did try writethrough just to try.
When the LV is without cache I got the expected behavior with 1MB transfer rate, But when I added the cahepool to the origin LV I do not see any performance enhancement at all. But creating a LV on the same disk were the cache pool is I get way faster transfer rate. I mounted all volumes in /etc/fstab with sync,dirsync options to avoid any other caching.
lvm cache
asked Mar 28 at 15:09
Jocke
7218
I'm using Ubuntu 16.04.4 and it's running on a VM.
The disk that has the origin data has an I/O limit on 1MB/s and disk for cache has no limit.
I have followed the guide at fibervillage
to create the LVM and succeeded without errors, with the modification to cachemode writeback, and I also did try writethrough just to try.
When the LV is without cache I got the expected behavior with 1MB transfer rate, But when I added the cahepool to the origin LV I do not see any performance enhancement at all. But creating a LV on the same disk were the cache pool is I get way faster transfer rate. I mounted all volumes in /etc/fstab with sync,dirsync options to avoid any other caching.
lvm cache
lvm cache
asked Mar 28 at 15:09
Jocke
7218
asked Mar 28 at 15:09
Jocke
7218
asked Mar 28 at 15:09
Jocke
7218
asked Mar 28 at 15:09
Jocke
7218
asked Mar 28 at 15:09
Jocke
7218
7218
Maybe you are using kernel version before 4.12? Take a look at this article, performance improves a lot since Linux kernel 4.12.
– cyfdecyf
Jul 30 at 5:09
add a comment |Â
Maybe you are using kernel version before 4.12? Take a look at this article, performance improves a lot since Linux kernel 4.12.
– cyfdecyf
Jul 30 at 5:09
Maybe you are using kernel version before 4.12? Take a look at this article, performance improves a lot since Linux kernel 4.12.
– cyfdecyf
Jul 30 at 5:09
Maybe you are using kernel version before 4.12? Take a look at this article, performance improves a lot since Linux kernel 4.12.
– cyfdecyf
Jul 30 at 5:09
add a comment |Â
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Maybe you are using kernel version before 4.12? Take a look at this article, performance improves a lot since Linux kernel 4.12.
– cyfdecyf
Jul 30 at 5:09