<div dir="ltr"><div class="gmail_quote"><div dir="ltr">Hello all,<div><br></div><div>I've discovered an issue in my lab that went unnoticed until recently, or just came about with the latest Centos release.</div><div><br></div><div>When the SSD hot tier is enabled read from the volume is 2MB/s, after detaching AND committing, read of the same file is at 150MB/s to /dev/null</div><div><br></div><div>If I copy the file to the hot bricks directly the write is 150MB/s and read is 500MB/s on the first read, and then 4GB/s on the subsequent reads (filesystem RAM caching) to /dev/null</div><div><br></div><div>Just enabling tier storage takes the performance to ~10-20IOPS and 2-10MB/s even for local node mounted volume.</div><div><br></div><div>I don't see any major log issues and I detached and did a fix-layout, but it persists when re-enabling the tier.</div><div><br></div></div>
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