Re: raid5-cache: deeply broken (with write-back?)

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On 08/28/2018 03:01 AM, Eyal Lebedinsky wrote:
> On 28/08/18 16:55, Lars Schimmer wrote:
>> On 08/28/18 04:55, Daniel Santos wrote:
>>
>>>
>>> I should note that for some reason the "32G" Optane only has 29.260 G
>>> bytes (27.3 GiB)
>>
>> Thats simple to explain, they use 32G = 32.000.000.000 Bytes, which
>> translates to 29,8 GByte (based on 1024).
>
> Not so. I notice the same. the OP says the disk reports 29.260GB
> (decimal) and 27.3GiB (binary).
> In other words, it is below the claimed 32GB (decimal).
>
> I have a few small USB disks that show the same issue.
>     SanDisk Ultra USB 3.0 Flash Drive 64GB
> fdisk reports as
>     Disk /dev/sdj: 57.9 GiB, 62109253632 bytes, 121307136 sectors
>
> and
>     SanDisk Ultra Fit USB 3.0 Flash Drive 32GB
> fdisk reports as
>     Disk /dev/sdj: 28.7 GiB, 30752636928 bytes, 60063744 sector
>
>> MfG,
>> Lars Schimmer
>

Yes, that's why I included both the G value and G.  More precisely
29260513280 bytes, which is the 57149440 sectors.  It hasn't exhibited
any failures, but considering its price I'm going to try to RMA it. 
They even have a 30GB product and I would still claim false advertising
if I got 29.26GB.

Daniel




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