One of the common task for SharePoint admins is to find out the size of site collections, subsites, libraries etc. Today I will discuss a few steps to get the sizes.
Size of Site collections:
Option 1:
This step would need you install AdminToolkit if you do not have it installed. Once you have installed Admin Toolkit, you would see an extra link in Cental Admin --> Application Management under Batch Site Manager which is "Move, Lock and Delete Site Collection"
Once this link is clicked, it opens up the _admin/escm.aspx page, where you can see the size of each site collection (even though they resided in the same content database). To update the content of this page, you will have to start the statistics aggregation job.
Option 2:
The other option to check for the site collection size would be to go to Central Admin --> Application Management. Click "Site collection quotas and locks". From the site collection section, select the site collection whose size you want to check. On selecting the site collection, you would see the Current storage used by the site collection in the Site Quota Information section.
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More details about the site sizes:
This process requires that you have a site quota enabled for the site collection. If you do not have a site quota enabled, go to central admin --> Application Management. Click "Site collection quotas and locks". From the site collection section, select the site collection whose size you want to check. Put a cap on the site size by setting a value for "Limit site storage to a maximum of". Click OK.