Could someone tell me if the fastmap feature in ubi is stable for use in production?

[Wang, Qiong (Q.)]

Hi Ezequiel,

Thanks for your advice. May I ask what patch that Richard gave to you to fix your bug? Is it the same as what Richard showed me before in the following link?

http://lists.infradead.org/pipermail/linux-mtd/2018-March/079610.html

Best Regards,
汪琼/Wang Qiong

软件与测试部/软件工程师Software Design&Test Dept./Software Engineer
Tel +86 25 8106 9232
E-mail: qwang34 at yfve.com.cn
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-----Original Message-----
From: Ezequiel Garcia [mailto:ezequiel at vanguardiasur.com.ar] 
Sent: 2018年4月11日 23:09
To: Richard Weinberger
Cc: Wang, Qiong (Q.); linux-mtd at lists.infradead.org
Subject: Re: Could someone tell me if the fastmap feature in ubi is stable for use in production?

Wang, Qiong (Q.),


On 9 April 2018 at 07:55, Richard Weinberger <richard.weinberger at gmail.com> wrote:
> Wang, Qiong (Q.),
>
> On Mon, Apr 9, 2018 at 12:25 PM, Wang, Qiong (Q.) <qwang34 at yfve.com.cn> wrote:
>> Hi experts,
>>
>> I have found the below link in the linux-mtd website explaining fastmap feature in ubi.
>> http://linux-mtd.infradead.org/doc/ubi.html#L_fastmap
>>
>> Our project uses large nand flash and I found that fastmap can reduce the ubi attach process to the time we want. Our concern is, since it is an experimental, is it stable to use in our project? Are there any reported issue of this feature?Our biggest worry is that can it possibly brick our system during the boot up process.

For what it's worth, I've used UBI fastmap in production, and so far we didn't have issues.

Note that we prepared a lot of tests, based on our particular use case. If I remember correctly, we hit one bug and Richard was kind enough to fix it in a few hours.

So my advise is: use it, but by all means test it. As anything else.

Hope it helps,
Eze