COSS rebuild time

Kris Amy

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Mar 1, 2010, 1:49:20 AM3/1/10

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Hi All,

Just wondering if anyone knows what the bottleneck is with COSS rebuilds.

On a test VM I have it takes almost the same amount of time to scan 1x32gig drive as opposed to 6x32gig drives. (10 min as opposed to 10.5)

All of the drives show 100% utilization when it is rebuilding so it is possibly something to do with the kernel. Any ideas?

Cheers,
Kris

Adrian Chadd

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Mar 1, 2010, 3:56:09 AM3/1/10

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Wait; can you be more clear about that? Are you saying that scanning 1
x 32 gig disk takes 10 minutes; and 6 x 32 gig disks takes 10.5
minutes?

Adrian

Nyamul Hassan

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Mar 1, 2010, 4:02:09 AM3/1/10

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I think that would be somewhat correct. In our systems, each proxy has 4 x HDDs each with 1 x 30 GB COSS.

When squid loads, starting with only 1 x COSS is just a little faster than 4 x COSS.

And, this has held true across the 4 identically configured proxies that we have here. This also does not change between Squid 2.7 and Lusca.

Regards

HASSAN

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Adrian Chadd

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Mar 1, 2010, 4:05:24 AM3/1/10

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Yeah it won't be faster than Squid-2.7. The main issue is that the
whole disk is being read in to figure out what is in the cache.

i'm part way through fixing that; it's just taking time to reshuffle
the code around enough to make solving that .. well, not so dirty.

Adrian

Kris Amy

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Mar 1, 2010, 4:09:59 AM3/1/10

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Yep,

But the more interesting thing is that in theory it should be able to do 1gbit/sec on the rebuild (regardless of if it is doing 1disk or 6) in total since this VM has 1gig access to the storage but it seems not.

Cheers,
K

Adrian Chadd

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Mar 1, 2010, 4:12:16 AM3/1/10

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You may be hitting some kind of controller limitation too..

Adrian

Nyamul Hassan

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Mar 1, 2010, 4:17:21 AM3/1/10

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1 Gbit / sec? Is you VM stored on physical media capable of such high DTS?

Regards

HASSAN

Kris Amy

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Mar 1, 2010, 4:24:12 AM3/1/10

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Sure is.

I think it's all about the SAS virtual controller. Where it runs at a certain mhz and that's the maximum operations per second the device can do.

Cheers,
Kris

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