Hello, I am planning to use (6) 1 TB disks in a hardware RAID 6 array which will yield 4 data disks per oVirt Gluster brick.
However. https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.5/html-single/administration_guide/index#sect-Disk_Configuration --- states "For RAID 6, the stripe unit size must be chosen such that the full stripe size (stripe unit * number of data disks) is between 1 MiB and 2 MiB, preferably in the lower end of the range. Hardware RAID controllers usually allow stripe unit sizes that are a power of 2. For RAID 6 with 12 disks (10 data disks), the recommended stripe unit size is 128KiB" In my case, each oVirt Gluster Brick would have 4 data disks which would mean a 256K hardware RAID stripe size ( by what I see above) to get the full stripe size unit to above 1 MiB ( 4 data disks X 256K Hardware RAID stripe = 1024 K ) Could I use a smaller stripe size ex. 128K -- since most of the oVirt virtual disk traffic will be small sharded files and a 256K stripe would seem to me to be pretty big.for this type of data ? Thanks For Your Help !! On Tue, Sep 29, 2020 at 8:22 PM C Williams <cwilliams3...@gmail.com> wrote: > Strahil, > > Once Again Thank You For Your Help ! > > On Tue, Sep 29, 2020 at 11:29 AM Strahil Nikolov <hunter86...@yahoo.com> > wrote: > >> One important step is to align the XFS to the stripe size * stripe width. >> Don't miss it or you might have issues. >> >> Details can be found at: >> https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.5/html-single/administration_guide/index#sect-Disk_Configuration >> >> Best Regards, >> Strahil Nikolov >> >> >> >> >> >> >> В вторник, 29 септември 2020 г., 16:36:10 Гринуич+3, C Williams < >> cwilliams3...@gmail.com> написа: >> >> >> >> >> >> Hello, >> >> We have decided to get a 6th server for the install. I hope to set up a >> 2x3 Distributed replica 3 . >> >> So we are not going to worry about the "5 server" situation. >> >> Thank You All For Your Help !! >> >> On Mon, Sep 28, 2020 at 5:53 PM C Williams <cwilliams3...@gmail.com> >> wrote: >> > Hello, >> > >> > More questions on this -- since I have 5 servers . Could the following >> work ? Each server has (1) 3TB RAID 6 partition that I want to use for >> contiguous storage. >> > >> > Mountpoint for RAID 6 partition (3TB) /brick >> > >> > Server A: VOL1 - Brick 1 directory >> /brick/brick1 (VOL1 Data brick) >> >> > Server B: VOL1 - Brick 2 + VOL2 - Brick 3 directory /brick/brick2 >> (VOL1 Data brick) /brick/brick3 (VOL2 Arbitrator brick) >> > Server C: VOL1 - Brick 3 directory >> /brick/brick3 (VOL1 Data brick) >> > Server D: VOL2 - Brick 1 directory >> /brick/brick1 (VOL2 Data brick) >> > Server E VOL2 - Brick 2 directory >> /brick/brick2 (VOL2 Data brick) >> > >> > Questions about this configuration >> > 1. Is it safe to use a mount point 2 times ? >> https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.3/html/administration_guide/formatting_and_mounting_bricks#idm139907083110432 >> says "Ensure that no more than one brick is created from a single mount." >> In my example I have VOL1 and VOL2 sharing the mountpoint /brick on Server B >> > >> > 2. Could I start a standard replica3 (VOL1) with 3 data bricks and add >> 2 additional data bricks plus 1 arbitrator brick (VOL2) to create a >> distributed-replicate cluster providing ~6TB of contiguous storage ? . >> > By contiguous storage I mean that df -h would show ~6 TB disk >> space. >> > >> > Thank You For Your Help !! >> > >> > On Mon, Sep 28, 2020 at 4:04 PM C Williams <cwilliams3...@gmail.com> >> wrote: >> >> Strahil, >> >> >> >> Thank You For Your Help ! >> >> >> >> On Mon, Sep 28, 2020 at 4:01 PM Strahil Nikolov <hunter86...@yahoo.com> >> wrote: >> >>> You can setup your bricks in such way , that each host has at least 1 >> brick. >> >>> For example: >> >>> Server A: VOL1 - Brick 1 >> >>> Server B: VOL1 - Brick 2 + VOL 3 - Brick 3 >> >>> Server C: VOL1 - Brick 3 + VOL 2 - Brick 2 >> >>> Server D: VOL2 - brick 1 >> >>> >> >>> The most optimal is to find a small system/VM for being an arbiter >> and having a 'replica 3 arbiter 1' volume. >> >>> >> >>> Best Regards, >> >>> Strahil Nikolov >> >>> >> >>> >> >>> >> >>> >> >>> >> >>> В понеделник, 28 септември 2020 г., 20:46:16 Гринуич+3, Jayme < >> jay...@gmail.com> написа: >> >>> >> >>> >> >>> >> >>> >> >>> >> >>> It might be possible to do something similar as described in the >> documentation here: >> https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.4/html/administration_guide/creating_arbitrated_replicated_volumes#sect-Create_Multiple_Arbitrated_Volumes >> -- but I'm not sure if oVirt HCI would support it. You might have to roll >> out your own GlusterFS storage solution. Someone with more Gluster/HCI >> knowledge might know better. >> >>> >> >>> On Mon, Sep 28, 2020 at 1:26 PM C Williams <cwilliams3...@gmail.com> >> wrote: >> >>>> Jayme, >> >>>> >> >>>> Thank for getting back with me ! >> >>>> >> >>>> If I wanted to be wasteful with storage, could I start with an >> initial replica 2 + arbiter and then add 2 bricks to the volume ? Could the >> arbiter solve split-brains for 4 bricks ? >> >>>> >> >>>> Thank You For Your Help ! >> >>>> >> >>>> On Mon, Sep 28, 2020 at 12:05 PM Jayme <jay...@gmail.com> wrote: >> >>>>> You can only do HCI in multiple's of 3. You could do a 3 server HCI >> setup and add the other two servers as compute nodes or you could add a 6th >> server and expand HCI across all 6 >> >>>>> >> >>>>> On Mon, Sep 28, 2020 at 12:28 PM C Williams < >> cwilliams3...@gmail.com> wrote: >> >>>>>> Hello, >> >>>>>> >> >>>>>> We recently received 5 servers. All have about 3 TB of storage. >> >>>>>> >> >>>>>> I want to deploy an oVirt HCI using as much of my storage and >> compute resources as possible. >> >>>>>> >> >>>>>> Would oVirt support a "replica 5" HCI (Compute/Gluster) cluster ? >> >>>>>> >> >>>>>> I have deployed replica 3s and know about replica 2 + arbiter -- >> but an arbiter would not be applicable here -- since I have equal storage >> on all of the planned bricks. >> >>>>>> >> >>>>>> Thank You For Your Help !! >> >>>>>> >> >>>>>> C Williams >> >>>>>> _______________________________________________ >> >>>>>> Users mailing list -- users@ovirt.org >> >>>>>> To unsubscribe send an email to users-le...@ovirt.org >> >>>>>> Privacy Statement: https://www.ovirt.org/privacy-policy.html >> >>>>>> oVirt Code of Conduct: >> https://www.ovirt.org/community/about/community-guidelines/ >> >>>>>> List Archives: >> https://lists.ovirt.org/archives/list/users@ovirt.org/message/AXTNUFZ3BASW2CWX7CWTMQS22324J437/ >> >>>>>> >> >>>>> >> >>>> >> >>> _______________________________________________ >> >>> Users mailing list -- users@ovirt.org >> >>> To unsubscribe send an email to users-le...@ovirt.org >> >>> Privacy Statement: https://www.ovirt.org/privacy-policy.html >> >>> oVirt Code of Conduct: >> https://www.ovirt.org/community/about/community-guidelines/ >> >>> List Archives: >> https://lists.ovirt.org/archives/list/users@ovirt.org/message/CECMD2SWBSBDAFP3TFMMYWTSV3UKU72E/ >> >>> >> >> >> > >> _______________________________________________ >> Users mailing list -- users@ovirt.org >> To unsubscribe send an email to users-le...@ovirt.org >> Privacy Statement: https://www.ovirt.org/privacy-policy.html >> oVirt Code of Conduct: >> https://www.ovirt.org/community/about/community-guidelines/ >> List Archives: >> https://lists.ovirt.org/archives/list/users@ovirt.org/message/CTSXBT6NUWVLQF6BOSL3YQD7VUQEVYJB/ >> >
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