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Server slows to a crawl when copying accounts from remote server

Comments

9 comments

  • vanessa
    The transfer rate is typically a network issue between the two servers, not an issue with server resources. Try rsyncing a large file between the servers and see how fast it goes. If it's still slow, one or both of your servers is on a slow network.
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  • cPanelMichael
    Hello :) Yes, as Vanessa mentioned, this is likely a network issue between the source/destination servers. You could try packaging an account on the source server, and then moving the archive to the destination server via SFTP or SCP to see if you notice any speed difference. Thank you.
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  • storminternet
    Check the resolver configuration of your servers. Sometimes setting up incorrect resolver can also cause slowness.
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  • cycas
    Thanks! I've tried moving large files using SFTP, and that doesn't have the same effect. If I move a big file onto the new server using sFTP, then OK, the transfer is open for a while as the data moves across, as you'd expect but everything else on the server continues to respond as quickly as normal. I can see that the network connection between Old Server and New Server might not be optimal, but I can't understand why New Server would suddenly start responding very slowly when doing something completely unrelated to the copy operation - eg, showing me a web page on another account, or displaying WHM pages. Surely while the data is copying across, that should be happening in the background - the server isn't doing anything much with it, and should be able to carry on with normal operations at the same time?
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  • cPanelMichael
    [quote="cycas, post: 1650562">Surely while the data is copying across, that should be happening in the background - the server isn't doing anything much with it, and should be able to carry on with normal operations at the same time?
    You may want to review other load statistics such as disk I/O when you notice the slowness. The following thread offers some good advice on investigating the source of load/slowness issues: Troubleshooting High Loads On Linux Systems Thank you.
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  • cycas
    So far as I can see, there is almost no load on New Server. It was showing this behaviour before any of the sites hosted on it had actually gone live, so it had generous amounts of disk space, memory, bandwidth, and almost nothing using it, apart from Cpanel doing a copy at a measily 0.1345 M/s and me, checking web pages and trying to view stuff in WHM. Can I take it from that reply that WHM would not normally take 20+ seconds to render a page when there is one copy occurring, and no other load? My new host is saying the problem is network connection between old and new server, but I don't see how that would slow everything else the server is doing so acutely.
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  • cPanelMichael
    It's difficult to say for sure without access to the affected system. You are welcome to open a support ticket so we can take a closer look and rule out any problems with the cPanel/WHM software itself. Thank you.
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  • cycas
    Thank you so much to everyone who replied to this thread. With the information you gave me, I had the confidence to go back to my new hosting provider about this. They had originally told me that the slowness must be a network issue on the wider internet, but after chasing them up about it several times and refusing to take 'we can't see the problem' for an answer, it turned out that the port on the new server was stuck at 1Mbps. They were able to resolve this and the server is now performing very nicely.
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  • cPanelMichael
    I am happy to see the issue has been resolved. Thank you for updating us with the outcome.
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