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Re: Squid high bandwidth IO issue (ramdisk SSD)

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Dear Waitman,


Testing the SSD drive, before installing it on the squid, showed huge
performance advantage in IOPS, read/write. So, I thought that this will
solve the problems I had with HDD.
But it was not so, look at this output:
12:39:35 PM  CPU   %user   %nice    %sys %iowait    %irq   %soft  %steal  
%idle    intr/s
12:39:37 PM  all    2.87    0.00    2.25   44.44    0.12    3.50    0.00  
46.82  11666.50
12:39:37 PM    0    0.00    0.00    0.00    0.00    0.50    4.50    0.00  
95.00   4764.00
12:39:37 PM    1    0.00    0.00    0.50    4.98    0.00    2.49    0.00  
92.04   2097.50
12:39:37 PM    2   11.56    0.00    8.54   76.88    0.00    3.02    0.00   
0.00   1977.50
12:39:37 PM    3    0.50    0.00    0.00   95.52    0.50    3.48    0.00   
0.00   2827.50

This is a moment before the system went down, the IO is up high.  


Waitman Gobble-2 wrote:
> 
> 
> smaugadi wrote:
>> Dear ALL,
>> We have a squid server with high volume of traffic, 200 – 300 MB.
>> The server is in transparent mode and using 18GB of ramdisk. With this
>> configuration performance is very good (after optimizing the squid and
>> the linux machine).
>> The problem is the small size of cache directory.
>> Since IO is a big issue with squid we purchased the intel ssd x25-m 160gb
> 
> hmmmm, i have not yet experimented with an ssd, but i've read that it's 
> advised to disable swap because heavy reads/writes kill the thing. the 
> information was in regards to using an ssd on a netbook running linux - 
> (for example running windows on the netbook with an ssd is certain 
> death, unavoidable doom - as you probably know windows machines read and 
> write to the disk like there's no tomorrow, and for no real good reason 
> - they swap just for the heck of it, even just turning the thing on it 
> starts swapping)
> 
> so... it would make sense to me that you're going to experience troubles 
> running a high traffic cache on an ssd.
> 
> Waitman
> 
> 
> 
> 
> 
> 

-- 
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