Re: [lustre-discuss] Large file read performance degradation from multiple OST's

2017-05-31 Thread Xiong, Jinshan
It’s LU-9574. Jinshan On May 30, 2017, at 12:24 PM, Jones, Peter A > wrote: Darby Can you please open a JIRA ticket with this information? Thanks Peter On 5/30/17, 12:10 PM, "lustre-discuss on behalf of Vicker, Darby (JSC-EG311)"

Re: [lustre-discuss] Large file read performance degradation from multiple OST's

2017-05-30 Thread Jones, Peter A
Darby Can you please open a JIRA ticket with this information? Thanks Peter On 5/30/17, 12:10 PM, "lustre-discuss on behalf of Vicker, Darby (JSC-EG311)" on behalf of

Re: [lustre-discuss] Large file read performance degradation from multiple OST's

2017-05-30 Thread Vicker, Darby (JSC-EG311)
Using the git bisect we were able to isolate the problem to this commit: commit d8467ab8a2ca15fbbd5be3429c9cf9ceb0fa78b8 LU-7990 clio: revise readahead to support 16MB IO In our testing, we can read from a large file (stripe count=4) at near line rate (10 GbE – so 1200 MB/s) using a client

Re: [lustre-discuss] Large file read performance degradation from multiple OST's

2017-05-26 Thread Vicker, Darby (JSC-EG311)
>> I tried a 2.8 client mounting the 2.9 servers and that showed the expected >> behavior ??? increasing >> performance with increasing OST's. Two things: >> >> 1. Any pointers to compiling a 2.8 client on recent RHEL 7 kernels would be >> helpful. I had to boot >> into an older kernel

Re: [lustre-discuss] Large file read performance degradation from multiple OST's

2017-05-26 Thread Daniel Kobras
Hi! On Wed, May 24, 2017 at 04:04:00PM +, Vicker, Darby (JSC-EG311) wrote: > I tried a 2.8 client mounting the 2.9 servers and that showed the expected > behavior ??? increasing performance with increasing OST's. Two things: > > 1. Any pointers to compiling a 2.8 client on recent RHEL 7

Re: [lustre-discuss] Large file read performance degradation from multiple OST's

2017-05-26 Thread Vicker, Darby (JSC-EG311)
sa.gov> Cc: "lustre-discuss@lists.lustre.org" <lustre-discuss@lists.lustre.org> Subject: Re: [lustre-discuss] Large file read performance degradation from multiple OST's On May 24, 2017, at 10:04, Vicker, Darby (JSC-EG311) <darby.vicke...@nasa.gov> wrote: >

Re: [lustre-discuss] Large file read performance degradation from multiple OST's

2017-05-26 Thread Dilger, Andreas
On May 24, 2017, at 10:04, Vicker, Darby (JSC-EG311) wrote: > > I tried a 2.8 client mounting the 2.9 servers and that showed the expected > behavior – increasing performance with increasing OST's. Two things: > > 1. Any pointers to compiling a 2.8 client on recent

Re: [lustre-discuss] Large file read performance degradation from multiple OST's

2017-05-24 Thread Vicker, Darby (JSC-EG311)
I tried a 2.8 client mounting the 2.9 servers and that showed the expected behavior – increasing performance with increasing OST's. Two things: 1. Any pointers to compiling a 2.8 client on recent RHEL 7 kernels would be helpful. I had to boot into an older kernel to get the above test done.

[lustre-discuss] Large file read performance degradation from multiple OST's

2017-05-22 Thread Vicker, Darby (JSC-EG311)
Hello, We recently noticed that the large file read performance on our 2.9 LFS is dramatically worse than it used to be. The attached plot is the result of a test script that uses dd to write a large file (50GB) to disk, read that file and then copy it to a 2nd file to test write, read and