[lustre-discuss] How to find the performance degrade reason

Zeeshan Ali Shah javaclinic at gmail.com
Sun Sep 16 02:05:43 PDT 2018


Thanks Cameron  ,

Is it possible to know which OST are actively in used for a  client lets
say during rsync copy .


/Zee

On Thu, Sep 13, 2018 at 2:17 AM Cameron Harr <harr1 at llnl.gov> wrote:

> I realize I didn't answer all the questions, so:
>
> 1) For a file-system-level view, we use ltop, a handy utility that's in
> the LMT package (https://github.com/LLNL/lmt). If you want to pinpoint
> OST or MDT tests, you could lock a file/dir to a particular OST/MDT and
> then use 'zpool iostat ...' to monitor I/O for that device
>
> 2) Again, I'd recommend getting ltop. 'zpool iostat' can give you numerous
> performance statistics as well.
>
> On 09/12/2018 04:11 PM, Cameron Harr wrote:
>
> Use 'zpool iostat -v ...'. You can review the man page for lots of
> options, including latency statistics.
>
> Cameron
>
> On 09/10/2018 11:21 AM, Zeeshan Ali Shah wrote:
>
> Dear All,
>
> Suddenly our lustre installation become dead slow, copying data from local
> source to lustre result around 20MB/sec before it was above 600 MB.
>
> i checked zfs status -xv and (all pool healths are ok)
>
> 1) How to check which OSTs are involved during data write operation ?
> 2) How to check Meta data (read and write) stats ?
> 3) any other advice to drill down the reason ..
>
>
> /Zeeshan
>
>
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