* [dm-crypt] dm-integrity and bcache
@ 2019-05-20 21:34 Robby Nelson
2019-05-21 6:27 ` Milan Broz
0 siblings, 1 reply; 3+ messages in thread
From: Robby Nelson @ 2019-05-20 21:34 UTC (permalink / raw)
To: dm-crypt
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I was hoping to see if anyone had any experience with or warnings about
using mdadm raid 1 with dm-integrity as a backing device for a bcache
device. I apologize if this is a dumb question, I don't have a great
technical understanding of all these systems.
Cheers,
Robby
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* Re: [dm-crypt] dm-integrity and bcache
2019-05-20 21:34 [dm-crypt] dm-integrity and bcache Robby Nelson
@ 2019-05-21 6:27 ` Milan Broz
2019-05-21 15:48 ` Robby Nelson
0 siblings, 1 reply; 3+ messages in thread
From: Milan Broz @ 2019-05-21 6:27 UTC (permalink / raw)
To: Robby Nelson, dm-crypt
On 20/05/2019 23:34, Robby Nelson wrote:
> I was hoping to see if anyone had any experience with or warnings
> about using mdadm raid 1 with dm-integrity as a backing device for a
> bcache device. I apologize if this is a dumb question, I don't have a
> great technical understanding of all these systems.
Hi,
in general, this combination should work (and several people try to use dm-integrity
as a backing device for MD raid), but I see some issues that dmintegrity
reveals in MD subsystem.
I am not sure about stability of bcache, this project had maintenance issues
in the past, I do not use it. There is also dm-cache (that is also somehow integrated
in LVM), that is at least maintained by the same group of people as dm-integrity :)
Anyway, I think a better list to ask is dm-devel@redhat-com, there are many people
that use similar various storage stack combinations.
I do not expect super-performance with dmintegrity it the stack (it will always slow
down operation). If you see any stability issues, please report them to the list above.
Thanks,
Milan
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [dm-crypt] dm-integrity and bcache
2019-05-21 6:27 ` Milan Broz
@ 2019-05-21 15:48 ` Robby Nelson
0 siblings, 0 replies; 3+ messages in thread
From: Robby Nelson @ 2019-05-21 15:48 UTC (permalink / raw)
To: dm-crypt
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Thank you for the input.
It sounds like bcache is no longer being worked on as the dev is spending
time on bcachefs instead. I considered dm-cache but it seems you can no
longer use lvm snapshots with it.
I will take a look at that mailing list, thank you.
Integrity at the cost of a little performance is fine with me in this
application.
Thanks,
Robby
On Mon, May 20, 2019 at 11:27 PM Milan Broz <gmazyland@gmail.com> wrote:
> On 20/05/2019 23:34, Robby Nelson wrote:
> > I was hoping to see if anyone had any experience with or warnings
> > about using mdadm raid 1 with dm-integrity as a backing device for a
> > bcache device. I apologize if this is a dumb question, I don't have a
> > great technical understanding of all these systems.
>
> Hi,
>
> in general, this combination should work (and several people try to use
> dm-integrity
> as a backing device for MD raid), but I see some issues that dmintegrity
> reveals in MD subsystem.
>
> I am not sure about stability of bcache, this project had maintenance
> issues
> in the past, I do not use it. There is also dm-cache (that is also somehow
> integrated
> in LVM), that is at least maintained by the same group of people as
> dm-integrity :)
>
> Anyway, I think a better list to ask is dm-devel@redhat-com, there are
> many people
> that use similar various storage stack combinations.
>
> I do not expect super-performance with dmintegrity it the stack (it will
> always slow
> down operation). If you see any stability issues, please report them to
> the list above.
>
> Thanks,
> Milan
>
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2019-05-20 21:34 [dm-crypt] dm-integrity and bcache Robby Nelson
2019-05-21 6:27 ` Milan Broz
2019-05-21 15:48 ` Robby Nelson
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