i had to move some sites of mine, so i changed my DNS for the nameservers, moved everything to the new host. Aside from the interruption how long it takes for the new DNS to propagate, is this in any way bad for SERP or google or in general ? I mean the sites are reachable again under the same name...except host and IP are different.
It's depends, up to 72 hours I think. You should keep your content on the old host until the propagation is over.
I think i worded my question wrong..yes i know about the propagation times...depends on the nameserver, yes. But i meant ASIDE from that outage problem....is there anything else bad to arise ? Or is it 100% transparent...eg for spidering....so google or whoever doesnt care whether the underlying host changed or not ? (Assuming the site is reachable again 100% all over the world) Thanks
i don't think it do anything... you are allowed to have downtime, i mean if its 72 hours google doesn't really mind ... as of what i experience.
No, I don't think there is any problems as long as your content is available wherever the bot will look for. What I mean is, make sure your content is still available at the first location and remove it only when you are sure that SE's bots have found the new one.
I have moved several of my sites to a new host 1 of them last month and another 1 last week and have not seen any differences in my stats or in my visit by google bots. However, I kept everything the same. Just moved my domains to a new host. You should be fine.