On 04/16/2015 01:17 AM, Somnath Roy wrote:
Here is the data with omap separated to another SSD and after 1000GB of fio writes (same profile)..
omap writes:
-------------
Total host writes in this period = 551020111 ------ ~2101 GB
Total flash writes in this period = 1150679336
data writes:
-----------
Total host writes in this period = 302550388 --- ~1154 GB
Total flash writes in this period = 600238328
So, actual data write WA is ~1.1 but omap overhead is ~2.1 and adding those getting ~3.2 WA overall.
Looks like we can get quite a bit of data out of the rocksdb log as
well. Here's a stats dump after a full benchmark run from an SSD backed
OSD with newstore, fdatasync, and xioxi's tuanbles to increase buffer sizes:
http://www.fpaste.org/212007/raw/
It appears that in this test at least, a lot of data gets moved to L3
and L4 with associated WA. Notice the crazy amount of reads as well!
Mark
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