Hi,
I am using xfs on a raid 5 (~100TB) and put log on external ssd device, the mount information is:
/dev/sdc on /data/fhgfs/fhgfs_storage type xfs (rw,relatime,attr2,delaylog,logdev=/dev/sdb1,sunit=512,swidth=15872,noquota).
when doing only reading / only writing , the speed is very fast(~1.5G), but when do both the speed is very slow (100M), and high r_await(160) and w_await(200000).
1. how can I reduce average request time?
2. can I use ssd as write/read cache for xfs?
Best regards,
Quanjun
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