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Hi Benjamin,
Can you tell us more about your work-load like the file size,
size of both hot and cold storage, how the files are created
(after attaching the tier or before attaching the tier) , how long
have you been using the tier volume, etc.
Regards
Rafi KC
On 09/03/2016 09:16 AM, Benjamin
Kingston wrote:
Hello all,
I've discovered an issue in my lab that went unnoticed
until recently, or just came about with the latest Centos
release.
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
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
Just enabling tier storage takes the performance to
~10-20IOPS and 2-10MB/s even for local node mounted
volume.
I don't see any major log issues and I detached and did
a fix-layout, but it persists when re-enabling the tier.
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