Poor ext4 performance questions

[fedora]

man tune2fs

suomi

On 11/11/2014 07:26 AM, George R Goffe wrote:
> Hi,
>
> I have some large ext4 filesystems with large numbers of files in them and performance really sucks. After inactivity, a simple ls takes minutes to complete. I'm pretty sure the drive is now powering itself down due to this inactivity.
>
>
> Are there tuning parameters that I could alter that would keep more of the filesystem meta data in memory? It looks like the data slowly migrates back to disk and as a result, takes minutes to fill back up enough to respond.
>
> Regards and THANKS for your help and your time,
>
> George...
>