# Re: \[PATCH\] Add udev-md-raid-safe-timeouts.rules

- From: Jes Sorensen \<jes.sorensen@gmail.com\>
- Date: 2018-02-01 14:09:41 
- List: linux-raid
- Page: https://ratatoskr.run/linux-raid/2018/02/6637862
- Thread: https://ratatoskr.run/linux-raid/2018/02/6637862/t.md

```text
On 01/26/2018 06:54 PM, Jonathan G. Underwood wrote:
> From: Jonathan Underwood <redacted>
> 
> These udev rules attempt to set a safe kernel controller
> timeout for disks containing RAID level 1 or higher
> partitions for commodity disks which do not have SCTERC
> capability, or do have it but it is disabled.
> 
> No attempt is made to change the STCERC settings on devices
> which support it.
> 
> This attempts to mitigate the problem described here:
> 
>     https://raid.wiki.kernel.org/index.php/Timeout_Mismatch
>     http://strugglers.net/~andy/blog/2015/11/09/linux-software-raid-and-drive-timeouts/
> 
> where the kernel controller may timeout on a read from a
> disk after the default timeout of 30 seconds and consequently
> cause mdraid to regard the disk as dead and eject it from the
> RAID array.
> 
> The mitigation is to set the timeout to 180 seconds for disks
> which contain a RAID level 1 or higher partition.
> 
> Signed-off-by: Jonathan G. Underwood <redacted>
> ---
>  udev-md-raid-safe-timeouts.rules | 61 ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 61 insertions(+)
>  create mode 100644 udev-md-raid-safe-timeouts.rules

Applied!

Thanks,
Jes


```