Am 23.08.21 um 00:53 schrieb Kai Börnert:
As far as i understand, more important factor (for the ssds) is if they have
power loss protections (so they can use their ondevice write cache) and how
many iops they have when using direct writes with queue depth 1
I just did a test for a hdd with block.db on ssd cluster using extra cheap
consumer ssds, adding the ssds reduced! the performance by about 1-2 magnitudes
You want to use SSDs with power loss protection. Also make sure that you have
the write cache is disabled on the SSD, enabling the write cache can be a
significant
performance penalty.
sdparm --clear WCE /dev/sdX
Peter
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