| To: | xfs@xxxxxxxxxxx |
|---|---|
| Subject: | Problem about very high Average Read/Write Request Time |
| From: | quanjun hu <huquanjun@xxxxxxxxx> |
| Date: | Sat, 18 Oct 2014 17:26:40 +0800 |
| Delivered-to: | xfs@xxxxxxxxxxx |
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|
Hi,
 ÂI 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).  Â1. how can I reduce average request time?  Â2. can I use ssd as write/read cache for xfs? BestÂregards, Quanjun |
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