Re: [ovirt-users] Storage Hardware for Hyperconverged oVirt: Gluster best practice

[ovirt]

If a disk fails (aka node fails) assuming no RAID, once the disk gets 
replaced, the node will rebuild?

Is that what will happen or am I over simplifying?

On 2018-01-26 09:02, Yaniv Kaul wrote:

On Fri, Jan 26, 2018 at 4:58 PM,  wrote:


Yaniv,

You bring up a valid point.

I asked about RAID since I was concerned about drive failures &
performance.
Since Gluster will handle data replication, using HBA seems like a
better choice?


Without local node replication (RAID), a failed disk == a failed node.
This may or may not be acceptable.
Y.


From Yaniv:

 I think there are two interesting questions here:
1. Why would you want RAID? Your data is replicated already on other
Gluster nodes. RAID writes will wear out the SSDs earlier and RAID
'wastes'
additional space. The reason may be because you don't want the node to
go
down in case of a single disk malfunction. Fair - but is that the
case?
2. I think HW RAID should be higher performing, but that's about it.
Y.

 On 2018-01-10 12:05, Roberto Nunin wrote:


Il 10 Gen 2018 20:40,  ha scritto:


oVirt + Gluster (hyperconverged) RAID question:
I have 3 nodes of SuperMicro hardware, each node has 1x SATADOM
(boot drive for o/s install) and 6x 1TB SSD (to be used for
Gluster).
For the SSDs, is hardware or software RAID preferred or do I use
an
HBA?
The RedHat docs seem to suggest hardware RAID, others on the forum
say HBA  or software RAID.

What are other folks using?


I'm using hardware raid.


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Re: [ovirt-users] Storage Hardware for Hyperconverged oVirt: Gluster best practice

[Yaniv Kaul]

On Fri, Jan 26, 2018 at 4:58 PM,  wrote:

> Yaniv,
>
> You bring up a valid point.
>
> I asked about RAID since I was concerned about drive failures &
> performance.
> Since Gluster will handle data replication, using HBA seems like a better
> choice?
>

Without local node replication (RAID), a failed disk == a failed node. This
may or may not be acceptable.
Y.


> From Yaniv:
>>>
>> I think there are two interesting questions here:
> 1. Why would you want RAID? Your data is replicated already on other
> Gluster nodes. RAID writes will wear out the SSDs earlier and RAID 'wastes'
> additional space. The reason may be because you don't want the node to go
> down in case of a single disk malfunction. Fair - but is that the case?
> 2. I think HW RAID should be higher performing, but that's about it.
> Y.
>
> On 2018-01-10 12:05, Roberto Nunin wrote:
>
>> Il 10 Gen 2018 20:40,  ha scritto:
>>
>> oVirt + Gluster (hyperconverged) RAID question:
>>> I have 3 nodes of SuperMicro hardware, each node has 1x SATADOM
>>> (boot drive for o/s install) and 6x 1TB SSD (to be used for
>>> Gluster).
>>> For the SSDs, is hardware or software RAID preferred or do I use an
>>> HBA?
>>> The RedHat docs seem to suggest hardware RAID, others on the forum
>>> say HBA  or software RAID.
>>>
>>> What are other folks using?
>>>
>>
>> I'm using hardware raid.
>>
>> ___
>>> Users mailing list
>>> Users@ovirt.org
>>> http://lists.ovirt.org/mailman/listinfo/users [1]
>>>
>>
>>
>>
>> Links:
>> --
>> [1] http://lists.ovirt.org/mailman/listinfo/users
>>
>
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Re: [ovirt-users] Storage Hardware for Hyperconverged oVirt: Gluster best practice

[ovirt]

Yaniv,

You bring up a valid point.

I asked about RAID since I was concerned about drive failures & 
performance.
Since Gluster will handle data replication, using HBA seems like a 
better choice?



From Yaniv:

I think there are two interesting questions here:
1. Why would you want RAID? Your data is replicated already on other
Gluster nodes. RAID writes will wear out the SSDs earlier and RAID 
'wastes'
additional space. The reason may be because you don't want the node to 
go

down in case of a single disk malfunction. Fair - but is that the case?
2. I think HW RAID should be higher performing, but that's about it.
Y.

On 2018-01-10 12:05, Roberto Nunin wrote:

Il 10 Gen 2018 20:40,  ha scritto:


oVirt + Gluster (hyperconverged) RAID question:
I have 3 nodes of SuperMicro hardware, each node has 1x SATADOM
(boot drive for o/s install) and 6x 1TB SSD (to be used for
Gluster).
For the SSDs, is hardware or software RAID preferred or do I use an
HBA?
The RedHat docs seem to suggest hardware RAID, others on the forum
say HBA  or software RAID.

What are other folks using?


I'm using hardware raid.


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Re: [ovirt-users] Storage Hardware for Hyperconverged oVirt: Gluster best practice

[Yaniv Kaul]

On Wed, Jan 10, 2018 at 10:12 PM, FERNANDO FREDIANI <
fernando.fredi...@upx.com> wrote:

> I really don't see much need of using hardware raid if you have a SSD-only
> environment. You will get little benefit from hardware cache memory and to
> guarantee the writes you may having the filesystem doing always sync
> operations, similar to what ZFS does. You just need to use a HBA to
> controll all disks ou even software RAID will do the job.


I think there are two interesting questions here:
1. Why would you want RAID? Your data is replicated already on other
Gluster nodes. RAID writes will wear out the SSDs earlier and RAID 'wastes'
additional space. The reason may be because you don't want the node to go
down in case of a single disk malfunction. Fair - but is that the case?
2. I think HW RAID should be higher performing, but that's about it.
Y.


>
> Fernando
>
>
>
> On 10/01/2018 17:34, ov...@fateknollogee.com wrote:
>
>> oVirt + Gluster (hyperconverged) RAID question:
>> I have 3 nodes of SuperMicro hardware, each node has 1x SATADOM (boot
>> drive for o/s install) and 6x 1TB SSD (to be used for Gluster).
>> For the SSDs, is hardware or software RAID preferred or do I use an HBA?
>> The RedHat docs seem to suggest hardware RAID, others on the forum say
>> HBA  or software RAID.
>>
>> What are other folks using?
>> ___
>> Users mailing list
>> Users@ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
>
> ___
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> Users@ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
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Re: [ovirt-users] Storage Hardware for Hyperconverged oVirt: Gluster best practice

[FERNANDO FREDIANI]

I really don't see much need of using hardware raid if you have a 
SSD-only environment. You will get little benefit from hardware cache 
memory and to guarantee the writes you may having the filesystem doing 
always sync operations, similar to what ZFS does. You just need to use a 
HBA to controll all disks ou even software RAID will do the job.


Fernando


On 10/01/2018 17:34, ov...@fateknollogee.com wrote:

oVirt + Gluster (hyperconverged) RAID question:
I have 3 nodes of SuperMicro hardware, each node has 1x SATADOM (boot 
drive for o/s install) and 6x 1TB SSD (to be used for Gluster).

For the SSDs, is hardware or software RAID preferred or do I use an HBA?
The RedHat docs seem to suggest hardware RAID, others on the forum say 
HBA  or software RAID.


What are other folks using?
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Re: [ovirt-users] Storage Hardware for Hyperconverged oVirt: Gluster best practice

[Roberto Nunin]

Il 10 Gen 2018 20:40,  ha scritto:

oVirt + Gluster (hyperconverged) RAID question:
I have 3 nodes of SuperMicro hardware, each node has 1x SATADOM (boot drive
for o/s install) and 6x 1TB SSD (to be used for Gluster).
For the SSDs, is hardware or software RAID preferred or do I use an HBA?
The RedHat docs seem to suggest hardware RAID, others on the forum say HBA
or software RAID.

What are other folks using?


I'm using hardware raid.

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[ovirt-users] Storage Hardware for Hyperconverged oVirt: Gluster best practice

[ovirt]

oVirt + Gluster (hyperconverged) RAID question:
I have 3 nodes of SuperMicro hardware, each node has 1x SATADOM (boot 
drive for o/s install) and 6x 1TB SSD (to be used for Gluster).

For the SSDs, is hardware or software RAID preferred or do I use an HBA?
The RedHat docs seem to suggest hardware RAID, others on the forum say 
HBA  or software RAID.


What are other folks using?
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