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SubjectRe: sequential I/O on SSD disk varies from 20 to 300 MBytes/s every week
> Please check whether write cache is enabled in the drive
> also check whether NCQ is enabled or not.

About caches please note quote from my e-mail below. Changing NCQ
enabled/disabled had no effect either.

>> 6) It is not a caching issue (controller/disk caches were off during
>> testing, but even putting them on had minor impact on the results)


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