Allinone Wp Migration 100gb Fix May 2026

Before we fix it, we need to understand why it is failing. It is almost never the plugin itself that sets a hard 100GB limit. The issue is usually a combination of two bottlenecks:

Important Note: While 100GB imports are technically possible, they are highly unstable over a browser connection. A browser timeout is almost guaranteed for files this size.

The Golden Rule: Do not try to import a single 100GB file via the browser interface.

Instead, use the methods below.

Open constants.php and look for these lines. They vary by version, but typically look like:

if ( ! defined( 'AI1WM_MAX_FILE_SIZE' ) ) 
    define( 'AI1WM_MAX_FILE_SIZE', 2 << 28 ); // 512MB default

The "100GB" math: To get the byte value for 100GB, the calculation is 100 * 1024 * 1024 * 1024. But the plugin often uses bitshifting. For safety, we will just set an absurdly high constant. allinone wp migration 100gb fix

Replace the above with:

if ( ! defined( 'AI1WM_MAX_FILE_SIZE' ) ) 
    // Set to 200GB (214748364800 bytes)
    // For truly unlimited, set to PHP_INT_MAX but be careful on 32-bit systems.
    define( 'AI1WM_MAX_FILE_SIZE', 214748364800 );

Alternatively, for "unlimited" (limited by your OS):

define( 'AI1WM_MAX_FILE_SIZE', 0 );

The All-in-One WP Migration 100GB fix is not a magical setting. It is a shift in methodology. You cannot upload 100GB through a web form.

The fix in one sentence: Manually upload your .wpress file into wp-content/plugins/all-in-one-wp-migration/storage/import.wpress via SFTP, add define('AI1WM_MAX_FILE_SIZE', 107374182400); to your wp-config.php, then run "Import from File" instead of "Upload."

If that fails, drop to WP-CLI or rsync. Do not waste $69 on the unlimited extension thinking it will solve physics. The unlimited extension removes the file size limit—it does not remove the upload limit of your hosting provider or the laws of HTTP timeouts. Before we fix it, we need to understand why it is failing

For 100GB, you need command line or direct file injection. Now go migrate that giant site.

The official documentation tries to hide this, but if you have SSH or FTP access to your server, you can bypass the 100GB upload limit entirely by avoiding the upload form.

Step-by-Step Method (Works up to your disk space limit, not 100GB):

Why this works: The plugin doesn't "upload" the file; it simply reads it from the local disk. This bypasses PHP's upload_max_filesize and the 100GB HTTP restriction entirely.

Result: You have just fixed the 100GB limit without changing a single line of code. Open constants

If you must export a 100GB site:

wp db export db.sql
tar -czf site_full.tar.gz wp-content db.sql --exclude="cache" --exclude="*.log"

That’s a raw backup – not .wpress format, but it works. Then on new server:

While you are in constants.php, look for AI1WM_MAX_CHUNK_RETRIES. Increase this to 50 so it doesn't give up on large files.

define( 'AI1WM_MAX_CHUNK_RETRIES', 50 );

| Problem | Fix | |---------|-----| | Memory exhausted | Add to wp-config.php: define('WP_MEMORY_LIMIT', '1024M'); | | Import stops at 0% | Check error_log. Often a missing PHP module (zip, curl). | | Uploads too big for CLI | Use rsync -avz --partial user@old:/wp-content/uploads/ /new/uploads/ | | Timeout during import | Use screen -S migration + wp ai1wm import ... – reattach with screen -r |