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15 Posts
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1452
June 10th, 2016 11:00
Does remounting a live filesystem with viruschecking cause any outage? (NAS)
Hello,
I have, what I hope, is a simple question. We are at the point of our NAS installation that we would like to start using AV. I already have CAVA installed and ready to go. The only thing left to do is enable the virus checking protocol on the file system mounts:
My understanding is that once this option is applied, the file system will be immediately remounted with this protocol enabled. These file systems are live, so my question is, will this remount cause any outage, even if its for 1-2 seconds? Or does the VNX cache/store any incoming requests during the remount, and then fulfill once its back?
Any information on this would be appreciated.
Thanks,
Tanner
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umichklewis
3 Apprentice
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1.2K Posts
1
June 11th, 2016 11:00
During a filesystem remount, the filesystem blocks I/O for several seconds. This time increases if there are more checkpoints mounted against this filesystem. Write requests will often block without any issue, but multiple, sequential read requests could encounter timeouts, if the remount takes too long.
An easy way to test is to create a small filesystem. Create a CIFS share on this filesystem and subject it to load.
You should be able to enabled viruschecking and observe the results. Needless to say, commiting your change to your production filesystem should be performed during a maintenance window or a period of low usage.
Let us know if that helps!
Karl
maniemc
169 Posts
1
June 11th, 2016 15:00
That option should get enabled automatically (default), when virus check service is started. So I dont think you need to change this flag.
Anycase, modifying mount options will happen very quickly and IOs will get success by retries, though it is good to follow Karl's suggestion of a maintenance window.
TannerR
15 Posts
0
June 13th, 2016 06:00
maniemc This option is enabled by default, but was disabled while we did AV testing, and migrations.
Thank you both for your replies! That answers my questions.