On Wed, 11 May 2016, ching lu wrote:

The read cache prevent the program to scrub the backing device directly.

if a few bits flipped in the backing device, the cache may still
return healthy data for a while.

Must i remove cache device before scrubbing?

What do you mean by scrub?

--
Eric Wheeler

On Wed, May 11, 2016 at 9:15 AM, Eric Wheeler [off-list ref] wrote:

quoted

On Fri, 29 Apr 2016, ching lu wrote:

quoted

Hello,

i want to develop a script to perform data scrubbing periodically.

I think you want to set dirty_percent to 0 and cache_mode=writethrough.
Then wait a long time for dirty_percent to actually reach 0.

--
Eric Wheeler

quoted

For my use case, i think it is meaningless to scrub cached data.

If i change the cache mode to "none", will it turn off the read cache too?

Furthermore, will this invalidate cached data? (i do not want to "warm
up" the cache again after the scrubbing)

Thanks in advance,
c
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