Re: [ceph-users] A cache tier issue with rate only at 20MB/s when data move from cold pool to hot pool

2015-07-30 Thread Kenneth Waegeman
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

[ceph-users] A cache tier issue with rate only at 20MB/s when data move from cold pool to hot pool

2015-06-16 Thread liukai
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 1Mb/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.

Re: [ceph-users] A cache tier issue with rate only at 20MB/s when data move from cold pool to hot pool

2015-06-16 Thread Kenneth Waegeman
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