Over 15,000 service unavailable 503 errors

I was looking under the Google Webmaster tools for one of our sites and under the Unreachable URLs section is a list of over 15K of URLs that for the past month have produced either a 503 error or a network unreachable error. The site in question has 100,000's of pages.

The server is in serious need of an upgrade to handle the overload in traffic which is causing these massive outages.

My question is, does this impact Google's Page Rank of the site?

This won't have any affect on pagerank for the site. That's only ever calculated from incoming links, so having some pages down won't make any difference there.

Where this WILL hurt you, is that Google won't be indexing any of the pages that it's getting these errors from, and that means a lot of your sites content just won't be available for searches. Google will come back eventually, but repeated errors like this will be a big issue, so it's best to get it sorted out as soon as possible.

Hi

It could be indirectly effecting your PR. This could be because some other sites may be linking to some of those 15,000 pages. This is a realistic possibility.

If they are and Google can not index the pages where the link points to, you wont get the added PR benefit as Google cant apply PR if a page is not in it's index.

Also you have to bare in mind that all pages that are in Googles index have PR regardess of any imbound links. This effect is so small it probably wont effect you but is something you should bare in mind. This could add a little extra PR alone once you sort the issue out as 15,000 pages is alot.

Also any unquie content might as well be in the bin, and a clever spammer might check what content is not being indexed and place the free content on their site and have it indexed first. This means YOU will be done for dup.content when you fix the problem as Google would have the content already indexed and assumed you copied from them.

Any PR effect shouldn't be a noticable effect as in moving some of your pages from a PR3-PR5 unless you have some high authority sites linking to unindexed pages. Update your sever and you MAY see an improvement.

You will certainly be losing some traffic, as Google cant index those pages so wont show them in the SERPS. Also, if Google sees a broken link it will take longer for it to index that page again next time.

I would upgrade the server. If you are getting that much traffic you should be making some good money from affiliate advertising which will more than pay for it (If not, get some new affiliate deals!)

yes i m agree with previous comment, you must upgrade your server. as this may affect your SERP. once crawler will not find your site than it will remove your page from its database.