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 >> >>>> >> >>> >> >>> ________ >> >>> >> >>> >> >>> >> >>> Community Meeting Calendar: >> >>> >> >>> Schedule - >> >>> Every 2nd and 4th Tuesday at 14:30 IST / 09:00 UTC >> >>> Bridge: https://bluejeans.com/441850968 >> >>> >> >>> Gluster-users mailing >> >listGluster-users@gluster.orghttps:// >> lists.gluster.org/mailman/listinfo/gluster-users >> >>> >> >>> >> >>> -- >> >>> Alvin Starr || land: (647)478-6285 >> >>> Netvel Inc. || Cell: >> >(416)806-0133alvin@xxxxxxxxxx || >> >>> >> >>> >> >>> ________ >> >>> >> >>> >> >>> >> >>> Community Meeting Calendar: >> >>> >> >>> Schedule - >> >>> Every 2nd and 4th Tuesday at 14:30 IST / 09:00 UTC >> >>> Bridge: https://bluejeans.com/441850968 >> >>> >> >>> Gluster-users mailing list >> >>> Gluster-users@xxxxxxxxxxx >> >>> https://lists.gluster.org/mailman/listinfo/gluster-users >> >>> >> >> >> ________ Community Meeting Calendar: Schedule - Every 2nd and 4th Tuesday at 14:30 IST / 09:00 UTC Bridge: https://bluejeans.com/441850968 Gluster-users mailing list Gluster-users@xxxxxxxxxxx https://lists.gluster.org/mailman/listinfo/gluster-users
