Thursday, June 10, 2021

Re: Unconsistent two-level write speed bouncing on softraid RAID1 SSD's

On 2021-06-10, Kent Watsen <kent@watsen.net> wrote:
> The Crucial BX500 SSD uses SMR technology, which is best used for infrequent-write applications.
> For general-purpose, and especially NAS, applications, CMR technology should be used.

hmm, does SMR stand for something other than "shingled magnetic recording"
related to storage? that only relates to HD not SSD.

>> On Jun 10, 2021, at 6:20 AM, Xavier Sanchez <xavier.s@mailoo.org> wrote:
>>
>> Written from my laptop directly to the device and
>> - good and constant read speed
>> - bouncing 7MB/s to high write speed

Bouncing between speeds is not impossible, SSDs often have faster cache
and do flash erase/programming in the background, until the cache is full.
But 7MB/s seems a bit too slow even then.

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