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/ht... --- 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 <cwilliams3320@gmail.com> wrote:
Strahil,
Once Again Thank You For Your Help !
On Tue, Sep 29, 2020 at 11:29 AM Strahil Nikolov <hunter86_bg@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/ht...
Best Regards, Strahil Nikolov
В вторник, 29 септември 2020 г., 16:36:10 Гринуич+3, C Williams < cwilliams3320@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 <cwilliams3320@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/ht... 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 <cwilliams3320@gmail.com> wrote:
Strahil,
Thank You For Your Help !
On Mon, Sep 28, 2020 at 4:01 PM Strahil Nikolov <hunter86_bg@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 < jaymef@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/ht... -- 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 <cwilliams3320@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 <jaymef@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 < cwilliams3320@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-leave@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/AXTNUFZ3BASW2C... >> >
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