# [OmniOS-discuss] performance extrremely low from nothing !

Dirk-Jan Wemmers dirkjan at in2ip.nl
Tue May 24 17:22:23 UTC 2016

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    Hi Fabio,

    is your pool (or one of your individual vdev’s) almost full? ZFS performance can take quite a nosedive when it fills up above say 80%.

    Regards,
    Dirk-Jan

    > On 24 May 2016, at 18:41, Fábio Rabelo <fabio at fabiorabelo.wiki.br> wrote:
    >
    > Competely lost here ...
    >
    > Found what command replaced the "zfs_vdev_max_pending" , and it make
    > no difference !
    >
    > First, I added this command to /etc/system :
    >
    > set zfs:zfs_vdev_max_active = 1
    >
    > make no diference, then added all this parameters :
    >
    > set zfs:zfs_vdev_async_read_max_active  = 3
    > set zfs:zfs_vdev_async_read_min_active  = 1
    > set zfs:zfs_vdev_async_write_max_active  = 11
    > set zfs:zfs_vdev_async_write_min_active  = 1
    > set zfs:zfs_vdev_max_active = 1
    > set zfs:zfs_vdev_scrub_max_active = 2
    > set zfs:zfs_vdev_scrub_min_active = 1
    > set zfs:zfs_vdev_sync_read_max_active  = 10
    > set zfs:zfs_vdev_sync_read_min_active  = 10
    > set zfs:zfs_vdev_sync_write_max_active = 1
    > set zfs:zfs_vdev_sync_write_min_active = 1
    > set zfs:zfs_vdev_async_write_active_max_dirty_percent = 60
    > set zfs:zfs_vdev_async_write_active_min_dirty_percent = 30
    >
    > no diference either ...
    >
    > Yes. I rebooted the machine for the first and the second try .
    >
    > Someone has any clue ?
    >
    >
    > Fábio Rabelo
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    > OmniOS-discuss at lists.omniti.com
    > http://lists.omniti.com/mailman/listinfo/omnios-discuss

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