Thank You Strahil !!

On Wed, Sep 30, 2020 at 12:21 PM Strahil Nikolov <hunter86...@yahoo.com>
wrote:

> In your case it seems reasonable, but you should test the 2 stripe sizes
> (128K vs 256K) before running in production. The good thing about replica
> volumes is that you can remove a brick , recreate it from cli and then add
> it back.
>
> Best Regards,
> Strahil Nikolov
>
>
>
>
>
>
> В сряда, 30 септември 2020 г., 17:03:11 Гринуич+3, C Williams <
> cwilliams3...@gmail.com> написа:
>
>
>
>
>
> 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
> >>>>>>>> _______________________________________________
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> >>>>>>>
> >>>>>>
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> >>>>>
> >>>>
> >>>
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