Hi all

On CURRENT r255173 we have some interesting values from vmstat -z : REQ = FAIL

[server]# vmstat -z
ITEM                   SIZE  LIMIT     USED     FREE      REQ FAIL SLEEP
....... skipped....
NCLNODE:                528,      0,       0,       0,       0,   0,   0
space_seg_cache:         64,      0,  289198,  299554,25932081,25932081,   0
zio_cache:              944,      0,   37512,   50124,1638254119,1638254119,   0
zio_link_cache:          48,      0,   50955,   38104,1306418638,1306418638,   0
sa_cache:                80,      0,   63694,      56,  198643,198643,   0
dnode_t:                864,      0,  128813,       3,  184863,184863,   0
dmu_buf_impl_t:         224,      0, 1610024,  314631,157119686,157119686,   0
arc_buf_hdr_t:          216,      0,82949975,   56107,156352659,156352659,   0
arc_buf_t:               72,      0, 1586866,  314374,158076670,158076670,   0
zil_lwb_cache:          192,      0,    6354,    7526, 2486242,2486242,   0
zfs_znode_cache:        368,      0,   63694,      16,  198643,198643,   0
..... skipped ......

Can anybody explain this strange failures in zfs related parameters in vmstat, 
can we do something with this and is this really bad signal?

Thanks!
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