# [OmniOS-discuss] Heavy NFS load causing OmniOS server to become unresponsive (kernel memory)

Doug Hughes doug at will.to
Fri Apr 22 16:05:31 UTC 2016

- Previous message: [OmniOS-discuss] SMB issues after r151014 -> r151018
- Next message: [OmniOS-discuss] SMB issues after r151014 -> r151018
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

    I didn't see this show up on the list, so I'm trying again.

    ----

    Been seeing this a bit lately on a server with 96GB ram where the zil is
    limited to 48GB. Under heavy NFS load (caused by user running parallel
    find/xargs/rm clean job), it sends the machine into desparation memory
    and causes it to be unreachable for a while. (the server is 24 x SSD,
    and internal I/O load is ok, but the many concurrent NFS requests cause
    it to die, sometimes requiring a reset. usually it recovers in a few
    minutes, but it becomes unservicible from memory shortage.

    I have some mdb/kmastat/kmausers/memstat output.

    here's the kmastat break down.

    Total [hat_memload] 15.8M    5155240     0
    Total [kmem_msb] 22.0G  987112603     0
    Total [kmem_firewall] 271M  411704261   895
    Total [kmem_va] 40.8G   22314937     0
    Total [kmem_default] 31.8G 4275706645   619
    Total [kmem_io_4P] 44.7M   26714639     0
    Total [kmem_io_4G] 108K        908     0
    Total [kmem_io_2G] 100K         68     0
    Total [bp_map]                                                0 7251     0
    Total [umem_np]                                               0 728     0
    Total [zfs_file_data] 118M      93380     0
    Total [zfs_file_data_buf] 19.4G   22030035     0
    Total [segkp] 256K       6787     0
    Total [ip_minor_arena_sa] 512      72304     0
    Total [ip_minor_arena_la]                                    64 29350     0
    Total [spdsock]                                               0 1     0
    Total [namefs_inodes]                                        64 27     0
    ------------------------------ ----- --------- --------- ------
    ---------- -----

    the kmausers is almost 1MB.

    -------------- next part --------------
    An HTML attachment was scrubbed...
    URL: <http://lists.omniti.com/pipermail/omnios-discuss/attachments/20160422/4cae3ab6/attachment.html>

- Previous message: [OmniOS-discuss] SMB issues after r151014 -> r151018
- Next message: [OmniOS-discuss] SMB issues after r151014 -> r151018
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

More information about the OmniOS-discuss mailing list