[OpenIndiana-discuss] why zpool import cost a long time or hung?

[Dang Zhiqiang]

Thank you very much.

Learning......



At 2014-06-30 05:40:31, "Jim Klimov" <jimklimov at cos.ru> wrote:
>On 2014-06-10 05:27, Dang Zhiqiang wrote:
>> Hi,
>> I want to know why zpool import cost a long time or hung? and how to fix it?
>> thanks.
>
>It might take some time to "think", in particular about delayed
>operations (i.e. large dataset deletions which were just marked
>as deleted, and then lots of metadata has to be raked through
>to actually free up the space - especially lots of work for some
>deduped datasets); this can be somewhat tracked by "zdb -bbLC pool"
>or somesuch (takes a minute to get the metadata) - see the progress
>and (non-zero-ness at all) of "Deferred free" and similar entries.
>
>Some more info can be gleaned with "iostat" to see if any disk io
>occurs (maybe lots of random slow ios).
>
>HTH,
>//Jim
>
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