EXTREMELY slow parity sync speed


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1 hour ago, Jomo said:

Thank you, though it is not clear to me what that setting does

Disk write caching is a feature that improves system performance by using RAM (volatile memory) to collect write commands sent to data storage devices and cache them until the slower storage device (ex: hard disk) can be written to later. As RAM is much faster than disk I/O, this allows data to move more quickly, at least until you exhaust your available RAM. It has some minor risk if your system isn't stable or protected from power failure with a UPS, but more when using move instead of copy. By default it appears that 6.7.x of unRAID set WCE to 1, so that all disks on the array are write cache enabled. Think of it as a RAM-disk buffer or storage device that's faster than even SSDs.


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