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 >>> >>>> >>> >>> >>> >>> ________ >>> >>> >>> >>> >>> >>> >>> >>> 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
