Re: [smartmontools-support] Anyway to speed up smartctl?

[Alex S. <ml...@os...>]

Sandon Van Ness wrote:
> I am trying to monitor the disk temps on my raid array but the problem I
> am seeing is that smartctl takes a long time to run:
>   
I think its normal behavior. You may run

strace -r smarctl <args>

which calls are time expensive.

But question is if you really need to poll temperature every minute? :)
> # time smartctl -A -d areca,8 /dev/sg4   | grep -i temp
> 190 Airflow_Temperature_Cel 0x0022   069   053   045    Old_age  
> Always       -       31 (Lifetime Min/Max 24/32)
> 194 Temperature_Celsius     0x0022   031   047   000    Old_age  
> Always       -       31 (0 21 0 0)
>
> real    0m0.502s
> user    0m0.020s
> sys     0m0.340s
>
> Sure .5s might not seem like much but this really adds up if you are
> polling say 20 drives and you want to poll them every minute. It also
> causes a lot of CPU usage on the machine just for polling temps. Is
> there anyway to poll just the temp (no other values) or anything else I
> can do to try to speeds this up and thus lower the amount of resources
> it takes to monitor my disks?
>
> It seems like some of this is specific with my areca controller as
> running this command on another machine of mine runs much quicker:
>
> myth ~ # time smartctl -A -d ata /dev/sdb | grep -i temp
> 194 Temperature_Celsius     0x0022   035   066   000    Old_age  
> Always       -       35 (Lifetime Min/Max 0/22)
>
> real    0m0.143s
> user    0m0.008s
> sys     0m0.000s
>
>
> And it takes almost no %sys time. I have verified this slow and high CPU
> usage behavior on two machines (one using an ARC-1231 and the other an
> ARC-1280).
>
> Any suggestions would be appreciated.
>
> Thanks!
> Sandon
>
>
>
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