Re: RBD fio Performance concerns

[Stefan Priebe - Profihost AG <s.priebe@profihost.ag>]

Am 22.11.2012 15:37, schrieb Mark Nelson:
> I don't think we recommend tmpfs at all for anything other than playing
> around. :)

I discussed this with somebody frmo inktank. Had to search the 
mailinglist. It might be OK if you're working with enough replicas and UPS.

I see no other option while working with SSDs - the only Option would be 
to be able to deaktivate the journal at all. But ceph does not support this.

Stefan

> On 11/22/2012 08:22 AM, Stefan Priebe - Profihost AG wrote:
>> Hi,
>>
>> can someone from inktank comment this? Might be using /dev/ram0 with an
>> fs on it be better than tmpfs as we can use dio?
>>
>> Greets,
>> Stefan
>>
>>> ----- Mail original -----
>>>
>>> De: "Stefan Priebe - Profihost AG" <s.priebe@profihost.ag>
>>> À: "Sébastien Han" <han.sebastien@gmail.com>
>>> Cc: "Mark Nelson" <mark.nelson@inktank.com>, "Alexandre DERUMIER"
>>> <aderumier@odiso.com>, "ceph-devel" <ceph-devel@vger.kernel.org>,
>>> "Mark Kampe" <mark.kampe@inktank.com>
>>> Envoyé: Jeudi 22 Novembre 2012 14:29:03
>>> Objet: Re: RBD fio Performance concerns
>>>
>>> Am 22.11.2012 14:22, schrieb Sébastien Han:
>>>> And RAMDISK devices are too expensive.
>>>>
>>>> It would make sense in your infra, but yes they are really expensive.
>>>
>>> We need something like tmpfs - running in local memory but support dio.
>>>
>>> Stefan
>>>
>
>
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