After VPS Migration Disk Performance Has Become Slower

10NANCY · #1 (**permalink**) 09-14-11, 02:44

I have a vps migrated from old server to a new server. After migration I found that Disk performance has become slower after migration onto New server.

Has anyone else faced this problem after migration of vps?

WebMaster · #2 (**permalink**) 09-14-11, 04:29

Could you please confirm if the server specs are similar as the old server has?

10NANCY · #3 (**permalink**) 09-14-11, 05:29

The newserver have higher specs then the old server, The new srever have latest ext4 filesystem.

WebMaster · #4 (**permalink**) 09-14-11, 06:37

This happens due to the set of the filesystem features are not enabled during the mount time. The below features commonly influence the extX filesystem performance:

Quote:

noatime

This feature disables registering a file access time.

Quote:

data=writeback

This feature allows metadata to be written asynchronously.

Quote:

barrier=0

This feature enables/disables the use of write barriers in the journalling block device code. When turned off, it allows you to bypass strict order while writing journal commits.

The last feature is enabled by default in ext4 and might be the reason for the visible performance degradation compared to the same device formatted with ext3.