* Can you switch caching modes on the fly during use?
@ 2023-02-06 9:54 Robert Krig
2023-02-09 2:38 ` Eric Wheeler
0 siblings, 1 reply; 2+ messages in thread
From: Robert Krig @ 2023-02-06 9:54 UTC (permalink / raw)
To: linux-bcache
Hi. I was just wondering.
My cache device is a MD Raid1 SSD.
My backing device is a BTRFS Raid10 on 8 Spinning disks.
Everything is setup as default. Which, as far as I recall means
writethrough caching.
Can I just switch the caching mode on the fly while the filesystem is in
use, without any risks of corruption, or do I need to detach the cache,
unmount the FS, etc...?
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Can you switch caching modes on the fly during use?
2023-02-06 9:54 Can you switch caching modes on the fly during use? Robert Krig
@ 2023-02-09 2:38 ` Eric Wheeler
0 siblings, 0 replies; 2+ messages in thread
From: Eric Wheeler @ 2023-02-09 2:38 UTC (permalink / raw)
To: Robert Krig; +Cc: linux-bcache
On Mon, 6 Feb 2023, Robert Krig wrote:
> Hi. I was just wondering.
>
> My cache device is a MD Raid1 SSD.
> My backing device is a BTRFS Raid10 on 8 Spinning disks.
>
>
> Everything is setup as default. Which, as far as I recall means writethrough
> caching.
>
> Can I just switch the caching mode on the fly while the filesystem is in use,
> without any risks of corruption, or do I need to detach the cache, unmount the
> FS, etc...?
Yep!
# cat /sys/block/bcache0/bcache/cache_mode
writethrough [writeback] writearound none
# echo writeback > /sys/block/bcache0/bcache/cache_mode
More info:
https://www.kernel.org/doc/Documentation/bcache.txt
-Eric
^ permalink raw reply [flat|nested] 2+ messages in thread
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