vmstat -z: zfs related failures on r255173
Allan Jude
freebsd at allanjude.com
Tue Oct 15 13:37:10 UTC 2013
On 2013-10-15 07:53, Dmitriy Makarov wrote:
> Please, any idea, thougth, help!
> Maybe what information can be useful for diggin - anything...
>
> System what I'm talkin about has a huge problem: performance degradation in short time period (day-two). Don't know can we somehow relate this vmstat fails with degradation.
>
>
>
>> 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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I am guessing those 'failures' are failures to allocate memory. I'd
recommend you install sysutils/zfs-stats and send the list the output of
'zfs-stats -a'
--
Allan Jude
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