I am dealing here with just 2 nodes and a bunch of disks on it... Just a scenario for study but real in many cases we face low budgets...
Anyway thanks for the tips!
---
Gilberto Nunes Ferreira
(47) 3025-5907
(47) 99676-7530 - Whatsapp / Telegram
Skype: gilberto.nunes36
Em qui., 30 de jul. de 2020 às 13:34, Strahil Nikolov <hunter86_bg@xxxxxxxxx> escreveu:
Anyway in raid1+spare on a replica 2 volume you will be using 6 disks in total.
It will be more optimal to get all those disks in 'replica 3' or 'replica 3 arbiter 1' (for the arbiter it would be optimal to have a small ssd and the data disks for tge actual data).
Best Regards,
Strahil Nikolov
На 30 юли 2020 г. 19:32:32 GMT+03:00, Strahil Nikolov <hunter86_bg@xxxxxxxxx> написа:
>When using legacy, you need to prepare the MBR on each disk, so the
>BIOS will be able to boot from it and load grub.
>
>On UEFI, you will need 2 entries each pointing to the other disk. There
>is a thread for each approach in the CentOS7 forums and the peocedure
>is almost the same on all linux .
>
>Best Regards,
>Strahil Nikolov
>
>На 30 юли 2020 г. 18:17:49 GMT+03:00, Gilberto Nunes
><gilberto.nunes32@xxxxxxxxx> написа:
>>I am using Legacy... But I am using Virtualbox in my labs... Perhaps
>>this
>>is the problem...
>>I don't do that in real hardware. But with spare disk (2 + 1) in mdadm
>>it's
>>fine.
>>
>>---
>>Gilberto Nunes Ferreira
>>
>>(47) 3025-5907
>>(47) 99676-7530 - Whatsapp / Telegram
>>
>>Skype: gilberto.nunes36
>>
>>
>>
>>
>>
>>Em qui., 30 de jul. de 2020 às 12:16, Strahil Nikolov
>><hunter86_bg@xxxxxxxxx>
>>escreveu:
>>
>>> The crash with failed mdadm disk is not normal. We need to check
>it
>>out.
>>>
>>> Are you using Legacy or UEFI ?
>>>
>>> Best Regards,
>>> Strahil Nikolov
>>>
>>> На 30 юли 2020 г. 16:25:47 GMT+03:00, Gilberto Nunes <
>>> gilberto.nunes32@xxxxxxxxx> написа:
>>> >But I will give it a try in the lvm mirroring process.... Thanks
>>> >---
>>> >Gilberto Nunes Ferreira
>>> >
>>> >(47) 3025-5907
>>> >(47) 99676-7530 - Whatsapp / Telegram
>>> >
>>> >Skype: gilberto.nunes36
>>> >
>>> >
>>> >
>>> >
>>> >
>>> >Em qui., 30 de jul. de 2020 às 10:23, Gilberto Nunes <
>>> >gilberto.nunes32@xxxxxxxxx> escreveu:
>>> >
>>> >> Well, actually I am not concerned ONLY about mirroring the data,
>>but
>>> >with
>>> >> reliability on it.
>>> >> Here during my lab tests I notice if I pull off a disk and then
>>power
>>> >on
>>> >> the server, the LVM crashes...
>>> >> On the other hand, with ZFS even in degraded state the system
>>booted
>>> >> normally.
>>> >> The same happens with mdadm. That's the point.
>>> >>
>>> >> ---
>>> >> Gilberto Nunes Ferreira
>>> >>
>>> >> (47) 3025-5907
>>> >> (47) 99676-7530 - Whatsapp / Telegram
>>> >>
>>> >> Skype: gilberto.nunes36
>>> >>
>>> >>
>>> >>
>>> >>
>>> >>
>>> >> Em qui., 30 de jul. de 2020 às 10:18, Alvin Starr
>><alvin@xxxxxxxxxx>
>>> >> escreveu:
>>> >>
>>> >>> LVM supports mirroring or raid1.
>>> >>> So to create a raid1 you would do something like "lvcreate -n
>>> >raidvol -L
>>> >>> 1T --mirrors 1 /dev/bigvg"
>>> >>> You can add a mirror to an existing logical volume using
>>lvconvert
>>> >with
>>> >>> something like "lvconvert --mirrors +1 bigvg/unmirroredlv"
>>> >>>
>>> >>> But other than simple mirroring you will need mdadm.
>>> >>>
>>> >>>
>>> >>>
>>> >>> On 7/30/20 8:39 AM, Gilberto Nunes wrote:
>>> >>>
>>> >>> Doing some research and the chvg command, which is responsable
>>for
>>> >create
>>> >>> hotspare disks in LVM is available only in AIX!
>>> >>> I have a Debian Buster box and there is no such command chvg.
>>> >Correct me
>>> >>> if I am wrong....
>>> >>> ---
>>> >>> Gilberto Nunes Ferreira
>>> >>>
>>> >>> (47) 3025-5907
>>> >>> (47) 99676-7530 - Whatsapp / Telegram
>>> >>>
>>> >>> Skype: gilberto.nunes36
>>> >>>
>>> >>>
>>> >>>
>>> >>>
>>> >>>
>>> >>> Em qui., 30 de jul. de 2020 às 02:05, Strahil Nikolov <
>>> >>> hunter86_bg@xxxxxxxxx> escreveu:
>>> >>>
>>> >>>> LVM allows creating/converting striped/mirrored LVs without any
>>> >dowtime
>>> >>>> and it's using the md module.
>>> >>>>
>>> >>>> Best Regards,
>>> >>>> Strahil Nikolov
>>> >>>>
>>> >>>> На 28 юли 2020 г. 22:43:39 GMT+03:00, Gilberto Nunes <
>>> >>>> gilberto.nunes32@xxxxxxxxx> написа:
>>> >>>> >Hi there....
>>> >>>> >
>>> >>>> >'till now, I am using glusterfs over XFS and so far so good.
>>> >>>> >Using LVM too....
>>> >>>> >Unfortunately, there is no way with XFS to merge two or more
>>HDD,
>>> >in
>>> >>>> >order
>>> >>>> >to use more than one HDD, like RAID1 or RAID5.
>>> >>>> >My primary goal is to use two server with GlusterFS on top of
>>> >multiples
>>> >>>> >HDDs for qemu images.
>>> >>>> >I have think about BTRFS or mdadm.
>>> >>>> >Anybody has some experience on this?
>>> >>>> >
>>> >>>> >Thanks a lot
>>> >>>> >
>>> >>>> >---
>>> >>>> >Gilberto Nunes Ferreira
>>> >>>>
>>> >>>
>>> >>> ________
>>> >>>
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