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Bud Durland

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One thing we are seeing with the upgrade to 9.2.7 sp3: The new version seems to be even more disk i/o intensive than the previous one. Our Connect server runs in a Debian 8 VM, with 4 CPUs and 12GB of RAM. Our mail store is appx 2.7TB, with ~7.5 million files

Such things are often hard to find the root cause for, but I'm trying. Running IOSTAT consistently shows the CPUs having a '%iowait' value over 25, which implies a disk problem to me. I'm not as fluent in Linux as I should be, so looking to others for testing / tweaking advice with regard to file system settings (the volume is EXT4), and so forth. Our storage is on a SAN, so I'm also looking to the vendor to advise if there's a way to speed that up.

Or maybe version 9.3 with the new speedier file system that was promised a year ago is on it's way. Smile

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Maerad

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With 9.2.7 Linux had encryption added - maybe this is turned on? Would incrase the I/O with encrypt/decrypt.

Also I'm not sure that your setup is great for kerio, even more so with a SAN. 7.5 mil files is quite something, that over a SAN connection with increased latency is already bad. And with kerio using a local file DB instread of something like MySQL... that could become a problem over time.

Yes, depends strongly on the SAN itself (raid type, ssd cache, type of harddrive, connection etc.) and for kerio you would need a SAN with fast read access at least. So a SSD Raid of some form or 10-15K SAS with SSD Cache.

Not to forget, depends on the users that access the files Smile
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Bud Durland

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Maerad wrote on Tue, 16 October 2018 04:46
With 9.2.7 Linux had encryption added - maybe this is turned on? Would incrase the I/O with encrypt/decrypt.


I wouldn't even know where to look to enable/disable that.
Edit: So I took off my dunce cap and looked in the Admin console. and found it under advanced options. Encryption is not enabled for our server.

Quote:
Also I'm not sure that your setup is great for kerio, even more so with a SAN. 7.5 mil files is quite something, that over a SAN connection with increased latency is already bad. And with kerio using a local file DB instread of something like MySQL... that could become a problem over time.


Agreed; I keep hoping for the speedy new message store system that was promised pre-GFI. Until then...

Quote:
Yes, depends strongly on the SAN itself (raid type, ssd cache, type of harddrive, connection etc.) and for kerio you would need a SAN with fast read access at least. So a SSD Raid of some form or 10-15K SAS with SSD Cache.


That's why we're budgeting for a new Synology Flashstation with enterprise level SSD.

[Updated on: Tue, 16 October 2018 15:39]

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