for example https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs-scrub

On May 12, 2016 3:13:22 AM GMT+08:00, Eric Wheeler [off-list ref] wrote:

On Wed, 11 May 2016, ching lu wrote:

quoted

The read cache prevent the program to scrub the backing device

directly.

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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

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On Wed, May 11, 2016 at 9:15 AM, Eric Wheeler

[off-list ref] wrote:

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On Fri, 29 Apr 2016, ching lu wrote:

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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.

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Then wait a long time for dirty_percent to actually reach 0.

--
Eric Wheeler

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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?

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Furthermore, will this invalidate cached data? (i do not want to

"warm

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up" the cache again after the scrubbing)

Thanks in advance,
c
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