[Gluster-users] GlusterFS over multiples HDD

[Strahil Nikolov]

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 at gmail.com> 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 at yahoo.com>
>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 at gmail.com> 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 at gmail.com> 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 at netvel.net>
>> >> 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 at yahoo.com> 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 at gmail.com> 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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>> >>>
>> >>> --
>> >>> Alvin Starr                   ||   land:  (647)478-6285
>> >>> Netvel Inc.                   ||   Cell:
>> >(416)806-0133alvin at netvel.net              ||
>> >>>
>> >>>
>> >>> ________
>> >>>
>> >>>
>> >>>
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