[ovirt-users] Good practices

[FERNANDO FREDIANI]

What you mentioned is a specific case and not a generic situation. The 
main point there is that RAID 5 or 6 impacts write performance compared 
when you write to only 2 given disks at a time. That was the comparison 
made.

Fernando


On 07/08/2017 16:49, Fabrice Bacchella wrote:
>
>> Le 7 août 2017 à 17:41, FERNANDO FREDIANI <fernando.frediani at upx.com 
>> <mailto:fernando.frediani at upx.com>> a écrit :
>>
>
>> Yet another downside of having a RAID (specially RAID 5 or 6) is that 
>> it reduces considerably the write speeds as each group of disks will 
>> end up having the write speed of a single disk as all other disks of 
>> that group have to wait for each other to write as well.
>>
>
> That's not true if you have medium to high range hardware raid. For 
> example, HP Smart Array come with a flash cache of about 1 or 2 Gb 
> that hides that from the OS. 

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