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hbianchi

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I received several claims from users, saying that Kerio (webmail) is working slow. This happens since we moved to 7.3.1 last week. We work on a Red Hat Linux box, with an array of 15 k SAS disks and so, the Hard Disk performance seems not to be the problem ( and in fact there has been no changes on it).

I noted, in the linux console, that the "load average" has incrased a lot: formerly, they was in 3 or 4 under standard traffic condition and now it is working between 6 to 9.

We have a dual processor Quad Xeon box (that is 8 processors) with 8GB memory. Processor and memory were not "an issue" for Kerio (only the HD I/O performance was).

Does somebody has noted similar fall in performance? Any idea? I think that "full search" process is taken some resorces but it is also clear, that Kerio is not taken advantage of 64 bytes architecture in Linux and that should also be considered.
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matti763

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Hi

Can you check a few things from the server. First, check command "top" and check what cause cpu load. If it is %us, then it is just normal application load or your application is not working correctly. It may be also that full search stuff. If it is %wa, then server have bottleneck on the disk I/O or network traffic.

Cpu0 : 1.0%us, 0.3%sy, 0.0%ni, 98.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st

To monitor one day load, try command "sar". It prints same statistics from last day. After that, you have to use commands "iostat" and vmstat" to find out how much I/O you need.

It is also good thing to measure how your disk is performing. This is from old IBM HS21 Blade card, 10k disks RAID1. Default LSI RAID controller:

hdparm -tT /dev/sda

/dev/sda:
Timing cached reads: 11252 MB in 2.00 seconds = 5629.04 MB/sec
Timing buffered disk reads: 178 MB in 3.02 seconds = 59.01 MB/sec

This is from IBM BladeCenter S RAID controllers, HS22 -cards, VMware ESX:

/dev/sda:
Timing cached reads: 23320 MB in 2.00 seconds = 11684.49 MB/sec
Timing buffered disk reads: 452 MB in 3.01 seconds = 150.11 MB/sec

Hope this helps. I also planning to upgrade to 7.3, but not sure anymore...


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