[OpenIndiana-discuss] zpool really slow

[jason matthews]

yikes. this was supposed to read:

> while c8t50014EE6561DDB4Cd0 is extremely slow (not full) and probably making the biggest impact on the pool at the moment, you need to consider that pool is also extremely full. the NAS pool is 95% utilized (1.15T/22.4T*100). For best performance try reducing storage utilization below 70%. Your zpool is spending a lot of time waiting for spinning rust to circle around so it can write to some free blocks.




On Oct 30, 2013, at 9:56 AM, jason matthews <jason at broken.net> wrote:

> 
> 
> while c8t50014EE6561DDB4Cd0 is extremely full and probably making the biggest impact on the pool at the moment, you need to consider that pool is also extremely full. the NAS pool is 95% utilized (1.15T/22.4T*100). For best performance try reducing storage utilization below 70%. Your zpool is spending a lot of time waiting for spinning rust to circle around so it can write to some free blocks.
> 
> 
> j.
> 
> On Oct 30, 2013, at 8:28 AM, Laurent Blume <laurent+oi at elanor.org> wrote:
> 
>> On 30/10/13 15:29, Jim Klimov wrote:
>>> In the posted output, c8t50014EE6561DDB4Cd0 consistently has large
>>> service times and percent-busy, while its other values are on par
>>> with those of other drives (KBs and IOs read/written).
>> 
>> My take on this is that the other values are actually the other drives aligning their performance on the slowest one.
>> So basically, in a given pool, kr/s, kw/s are always going to be the same, no matter what, and they'll be the speed of whatever drive is slowest in the pool. The asvc_t and %b, however, will designate the culprit.
>> 
>>> See in FMA (i.e. "fmdump") or plain "dmesg" (/var/adm/messages*)
>>> if there are reports of it being broken or otherwise already
>>> suspected by the system? Possibly, "iostat -En" would show a
>>> non-zero counter as well?
>> 
>> iostat -Exn then smartctl, yup.
>> 
>> Laurent
>> 
>> 
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> 
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