Re: [PATCH] ubifs: Introduce a mount option of force_atime.

[Richard Weinberger <richard@nod.at>]

Am 08.06.2015 um 11:54 schrieb Dongsheng Yang:
> On 06/08/2015 05:33 PM, Richard Weinberger wrote:
>> Am 08.06.2015 um 11:11 schrieb Dongsheng Yang:
>>> On 06/08/2015 04:44 PM, Richard Weinberger wrote:
>>>> Am 08.06.2015 um 10:27 schrieb Dongsheng Yang:
>>>>> Currently, ubifs does not support access time anyway. I understand
>>>>> that there is a overhead to update inode in each access from user.
>>>>>
>>>>> But for the following two reasons, I think we can make it optional
>>>>> to user.
>>>>>
>>>>> (1). More and more flash storage in server are trying to use ubifs,
>>>>> it is not only for a device such as mobile phone any more, we want
>>>>> to use it in more and more generic way. Then we need to compete
>>>>> with some other main filesystems. From this point, access time is
>>>>> necessary to us, at least as a choice to user currently.
>>>>
>>>> Do you have a reference? I know that modern servers use a lot of SSDs
>>>> which use internally NAND (mostly MLC and TLC).
>>>> But which systems use RAW NAND where they would care about the atime?
>>>
>>> Hi Richard,
>>>
>>> Thanx for your quick response here.
>>>
>>> http://www.slideshare.net/FujitsuTS/bos-c113a-data-will-change-business-but-will-it-really-change-ict
>>> I am not sure is that url available to you. But that's what my team is
>>> focus on. It's about a server-using NAND device.
>>
>> So, you want to use UBI/UBIFS on NAND attached via PCEe?
>> Is this SLC NAND? (UBI and UBIFS was designed with SLC in mind).
>> MLC and TLC are a major challenge for UBI/UBIFS.
> 
> It's SLC.

Where can i get one of those? ;-)

Thanks,
//richard