* Enabling discard rendered caching device unuseable
@ 2017-11-06 10:04 Clemens Eisserer
2017-11-07 18:17 ` Michael Lyle
0 siblings, 1 reply; 3+ messages in thread
From: Clemens Eisserer @ 2017-11-06 10:04 UTC (permalink / raw)
To: linux-bcache
Hi,
After using bcache for 9 months without any issues, I discovered the
"discard" flag for the caching device.
Running 4.13.5 I gave it a try, however after reboot the caching
device failed to register with:
At reboot bcache failed with:
prio_read() bad csum reading priorities
prio_read() bad magic reading priorities
The SSD used as caching device was a OCZ-OCTANE with the latest
firmware, which worked (and works) flawlessly for years and has no
SMART issues.
Best regards, Clemens
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Enabling discard rendered caching device unuseable
2017-11-06 10:04 Enabling discard rendered caching device unuseable Clemens Eisserer
@ 2017-11-07 18:17 ` Michael Lyle
2018-01-15 9:31 ` Clemens Eisserer
0 siblings, 1 reply; 3+ messages in thread
From: Michael Lyle @ 2017-11-07 18:17 UTC (permalink / raw)
To: Clemens Eisserer; +Cc: linux-bcache
Clemens--
I'm sorry for this experience; I've added discard to my list of things
to review.
I suggest avoiding discard for bcache; since the cache device grows
until it is nearly full and is kept in that state, there is little
benefit from it.
Mike
On Mon, Nov 6, 2017 at 2:04 AM, Clemens Eisserer <linuxhippy@gmail.com> wrote:
> Hi,
>
> After using bcache for 9 months without any issues, I discovered the
> "discard" flag for the caching device.
> Running 4.13.5 I gave it a try, however after reboot the caching
> device failed to register with:
>
> At reboot bcache failed with:
> prio_read() bad csum reading priorities
> prio_read() bad magic reading priorities
>
> The SSD used as caching device was a OCZ-OCTANE with the latest
> firmware, which worked (and works) flawlessly for years and has no
> SMART issues.
>
> Best regards, Clemens
> --
> To unsubscribe from this list: send the line "unsubscribe linux-bcache" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Enabling discard rendered caching device unuseable
2017-11-07 18:17 ` Michael Lyle
@ 2018-01-15 9:31 ` Clemens Eisserer
0 siblings, 0 replies; 3+ messages in thread
From: Clemens Eisserer @ 2018-01-15 9:31 UTC (permalink / raw)
To: linux-bcache
Hi Michael,
> I'm sorry for this experience; I've added discard to my list of things
> to review.
>
> I suggest avoiding discard for bcache; since the cache device grows
> until it is nearly full and is kept in that state, there is little
> benefit from it.
Good to know, thanks for the advice.
Best regards, Clemens
^ permalink raw reply [flat|nested] 3+ messages in thread
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2017-11-06 10:04 Enabling discard rendered caching device unuseable Clemens Eisserer
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2018-01-15 9:31 ` Clemens Eisserer
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