* [linux-lvm] Questions about monitoring, scrubbing & checking a LVM RAID5
@ 2021-07-28 21:50 Martin Dünkelmann
2021-07-29 14:59 ` David Teigland
0 siblings, 1 reply; 3+ messages in thread
From: Martin Dünkelmann @ 2021-07-28 21:50 UTC (permalink / raw)
To: linux-lvm
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Dear LVM2-People,
I made a native RAID5 via LVM on 3 SSDs without mdadm, since LVM2 can do
it natively.
But I got confused about how to easily monitor it (send emails about
errors, since it's a remove server) and how to check, repair and scrub
the RAID5.
Using:
"sudo lvchange --syncaction check cryptdata_raid5/home" (same for
repair) results in
Command on LV cryptdata_raid5/home does not accept LV type linear.
Command not permitted on LV cryptdata_raid5/home.
Does that mean LVM2 doesn't fully support native RAID5 and I should
format everything and set up a mdadm raid5?
Because mdadm has scrubbing and email reports according to the mdadm.conf.
--
Mit freundlichen Grüßen
Martin Dünkelmann
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_______________________________________________
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read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [linux-lvm] Questions about monitoring, scrubbing & checking a LVM RAID5
2021-07-28 21:50 [linux-lvm] Questions about monitoring, scrubbing & checking a LVM RAID5 Martin Dünkelmann
@ 2021-07-29 14:59 ` David Teigland
2021-07-29 15:53 ` Martin Dünkelmann
0 siblings, 1 reply; 3+ messages in thread
From: David Teigland @ 2021-07-29 14:59 UTC (permalink / raw)
To: Martin Dünkelmann; +Cc: linux-lvm
On Wed, Jul 28, 2021 at 11:50:56PM +0200, Martin Dünkelmann wrote:
> Dear LVM2-People,
>
> I made a native RAID5 via LVM on 3 SSDs without mdadm, since LVM2 can do it
> natively.
>
> But I got confused about how to easily monitor it (send emails about errors,
> since it's a remove server) and how to check, repair and scrub the RAID5.
>
> Using:
> "sudo lvchange --syncaction check cryptdata_raid5/home" (same for repair)
> results in
>
> Command on LV cryptdata_raid5/home does not accept LV type linear.
> Command not permitted on LV cryptdata_raid5/home.
It works for me, so it could be a fixed bug. Check that the LV is really
raid5: lvs -o segtype cryptdata_raid5/home
> Does that mean LVM2 doesn't fully support native RAID5 and I should format
> everything and set up a mdadm raid5?
> Because mdadm has scrubbing and email reports according to the mdadm.conf.
Right, mdadm does much more.
Dave
_______________________________________________
linux-lvm mailing list
linux-lvm@redhat.com
https://listman.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [linux-lvm] Questions about monitoring, scrubbing & checking a LVM RAID5
2021-07-29 14:59 ` David Teigland
@ 2021-07-29 15:53 ` Martin Dünkelmann
0 siblings, 0 replies; 3+ messages in thread
From: Martin Dünkelmann @ 2021-07-29 15:53 UTC (permalink / raw)
To: David Teigland; +Cc: linux-lvm
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Dear Dave,
thank you for your response.
Here is my output:
$ sudo lvs -o segtype cryptdata_raid5/home
Type
linear
linear
linear
And if I execute:
"$ sudo lvconvert --type raid5 -i 3 cryptdata_raid5/home"
I get
Using default stripesize 64,00 KiB.
Replaced LV type raid5 (same as raid5_ls) with possible type raid1.
Repeat this command to convert to raid5 after an interim conversion
has finished.
Are you sure you want to convert linear LV cryptdata_raid5/home to
raid1 type? [y/n]: y
Insufficient free space: 1 extents needed, but only 0 available
So probably I hit a bug with lvm2-2.03.12 on arch linux.
Thanks for your help.
Then it will be better to reformat my RAID5 with mdadm.
Am 29.07.21 um 16:59 schrieb David Teigland:
> On Wed, Jul 28, 2021 at 11:50:56PM +0200, Martin Dünkelmann wrote:
>> Dear LVM2-People,
>>
>> I made a native RAID5 via LVM on 3 SSDs without mdadm, since LVM2 can do it
>> natively.
>>
>> But I got confused about how to easily monitor it (send emails about errors,
>> since it's a remove server) and how to check, repair and scrub the RAID5.
>>
>> Using:
>> "sudo lvchange --syncaction check cryptdata_raid5/home" (same for repair)
>> results in
>>
>> Command on LV cryptdata_raid5/home does not accept LV type linear.
>> Command not permitted on LV cryptdata_raid5/home.
> It works for me, so it could be a fixed bug. Check that the LV is really
> raid5: lvs -o segtype cryptdata_raid5/home
>
>> Does that mean LVM2 doesn't fully support native RAID5 and I should format
>> everything and set up a mdadm raid5?
>> Because mdadm has scrubbing and email reports according to the mdadm.conf.
> Right, mdadm does much more.
>
> Dave
>
--
Greetings
Martin
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_______________________________________________
linux-lvm mailing list
linux-lvm@redhat.com
https://listman.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-07-28 21:50 [linux-lvm] Questions about monitoring, scrubbing & checking a LVM RAID5 Martin Dünkelmann
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