Hi, all I have yet to find a good solution, and some one have any suggestions.
I think this is a big problem when you use cache tier. 2015-08-03 liukai 发件人：Kenneth Waegeman <kenneth.waege...@ugent.be> 发送时间：2015-07-30 17:31 主题：Re: [ceph-users] A cache tier issue with rate only at 20MB/s when data move from cold pool to hot pool 收件人："liukai"<liu...@vclusters.com>,"ceph-users"<ceph-us...@ceph.com> 抄送： On 06/16/2015 01:17 PM, Kenneth Waegeman wrote: > Hi! > > We also see this at our site: When we cat a large file from cephfs to > /dev/null, we get about 10MB/s data transfer. I also do not see a > system resource bottleneck. > Our cluster consists of 14 servers with each 16 disks, together forming > a EC coded pool. We also have 2SSDs per server for the cache. Running > 0.94.1 Hi, Does someone has an idea about this? Is there some debugging or testing we can do to find the problem here? Thank you! Kenneth > > So we are having the same question. > > Our cache pool is in writeback mode, can it help to set it in readonly > for this? > > Kenneth > > On 06/16/2015 12:58 PM, liukai wrote: >> Hi all， >> A cache tier, 2 hot node with 8 ssd osd, and 2 cold node with 24 sata >> osd. >> >> The public network rate is 10000Mb/s and cluster network rate is >> 1000Mb/s. >> >> Using fuse-client to access the files. >> The issue is: >> >> When the files are in hot pool, the copy rate is very fash. >> >> But when the files are only in cold pool, the rate only reach 20MB/s. >> >> I known that when files are not in the hot pool, the files should >> been copy from cold pool to hot pool first, and then from hot pool to >> client. >> >> But the cpu, ram and network seems not the bottleneck. and will be >> the cause of system design? >> >> Are there some params to adjust to improve the rate from cold pool to >> hot pool? >> >> Thanks >> 2015-06-16 >> ------------------------------------------------------------------------ >> liukai >> >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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