snyderkv
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NetApp snapmirror bandwidth option
EE,
Hi thanks in advance for the help.
My question is how should we throttle snapmirror within the /etc/snapmirror.conf file? (or wizard) when transferring 3TB of data to another filer over a 20GB fiber link? We have 20GB from the NetApp to the switch via two 10GB cables and two 10GB fibers over a single vPC from switch to switch connecting to the other storage over the same configuration. I know NetApp throttles but am not sure how the initial sync will affect the performance and bandwidth of the system
Thanks again everyone
Hi thanks in advance for the help.
My question is how should we throttle snapmirror within the /etc/snapmirror.conf file? (or wizard) when transferring 3TB of data to another filer over a 20GB fiber link? We have 20GB from the NetApp to the switch via two 10GB cables and two 10GB fibers over a single vPC from switch to switch connecting to the other storage over the same configuration. I know NetApp throttles but am not sure how the initial sync will affect the performance and bandwidth of the system
Thanks again everyone
ASKER
Oh you're saying your DR site is actively has VOIP services? Good point. Yes we do use it as a "warm" site if you will and have random services over there possibly VOIP but is avoided when need be.
So the question is, how much do you throttle and do you pick specific interfaces for the snapmirror traffic as well?
So the question is, how much do you throttle and do you pick specific interfaces for the snapmirror traffic as well?
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ASKER
You mean deduplication? We have turned that on as I understand replication is more efficiant. I won't know if the system or network is under load until initialization but 2 mbs over a 20GB link? I'll re read the netapp snapmirror document but I don't remember much talk about this
ASKER
Oh you mean network compression. We have 20GB link that is unsaturated with just a few services. I don't think it would make sense to enable compression.
ASKER
From what I read from doc tr-3446 is that the NetApp does not throttle and is unlimited. I'm not sure how it works but I think the 7MB windowing keeps it from saturdating the link. In any case we are going to leave the default. If anyone has better information than I gathered please provide.
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ASKER
Ah I didn't think about that, the writes are limited by the 10k rpm disks whatever that comes out to
ASKER
Ok it ran fine with defaults, no compression or throttling. Jumbo frames are enabled but I thought it was odd that we only get a couple hundred megs of throughput. I also noticed I can run multiple concurrent snapmirrors at the same exact time (5 Total) with no change in CPU or network according to sysstat -s before and after every snapmirror initialization.
ASKER
By no change I mean no change between 1 and 5 snapmirror initializations. It does increase from 0 to 1 and then stays.
We found we needed to throttle the bandwidth of a snapmirror function overnight when all our snapmirror functions occurred to our DR site, because we also carry VOIP telephone functions across to the DR site, when using the DR LAN, and it cause all the telephones to be lost.....
If you use a bandwidth throttle, your initial sync will take much longer to complete.
Are they any other vital network services that use this link you need to "protect" ?