The "lfs getstripe /path/to/file" command will tell you which OSTs are used for each file. Different files will be allocated from different OSTs. By default, stipe_count = 1, so each file will be on a single OST.
On Sep 16, 2018, at 03:05, Zeeshan Ali Shah <[email protected]> wrote: > > Is it possible to know which OST are actively in used for a client lets say > during rsync copy . > > On Thu, Sep 13, 2018 at 2:17 AM Cameron Harr <[email protected]> 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 Cheers, Andreas --- Andreas Dilger Principal Lustre Architect Whamcloud
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