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I'm developing a LAMP online store, which will allow admin to upload multiple images for each item. My concern is - right off the bat there will be 20000 items meaning roughly 60000 images. QUESTIONS: • What is the maximum number of files and/or folders on Linux? • What is the usual way of handling this situation (best practice)? My idea was to make a folder for each item, based on it's unique ID, but then I'd still have 20000 folders in a main uploads folder, and it will grow indefinitely as old items won't be removed. Thanks for any help. Install Water Softener Without Loop.

Ext[234] filesystems have a fixed maximum number of inodes; every file or directory requires one inode. You can see the current count and limits with df -i. For example, on a 15GB ext3 filesystem, created with the default settings: Filesystem Inodes IUsed IFree IUse% Mounted on /dev/xvda 19 7% / There's no limit on directories in particular beyond this; keep in mind that every file or directory requires at least one filesystem block (typically 4KB), though, even if it's a directory with only a single item in it. As you can see, though, 80,000 inodes is unlikely to be a problem. And with the dir_index option (enablable with tune2fs), lookups in large directories aren't too much of a big deal. However, note that many administrative tools (such as ls or rm) can have a hard time dealing with directories with too many files in them.

As such, it's recommended to split your files up so that you don't have more than a few hundred to a thousand items in any given directory. An easy way to do this is to hash whatever ID you're using, and use the first few hex digits as intermediate directories. For example, say you have item ID 12345, and it hashes to 'DEADBEEF02842.'

You might store your files under /storage/root/d/e/12345. You've now cut the number of files in each directory by 1/256th.

If your server's filesystem has the dir_index feature turned on (see tune2fs(8) for details on checking and turning on the feature) then you can reasonably store upwards of 100,000 files in a directory before the performance degrades. ( dir_index has been the default for new filesystems for most of the distributions for several years now, so it would only be an old filesystem that doesn't have the feature on by default.) That said, adding another directory level to reduce the number of files in a directory by a factor of 16 or 256 would drastically improve the chances of things like ls * working without over-running the kernel's maximum argv size.

Typically, this is done by something like: /a/a1111 /a/a1112. I.e., prepending a letter or digit to the path, based on some feature you can compute off the name. (The first two characters of md5sum or sha1sum of the file name is one common approach, but if you have unique object ids, then 'a'+ id% 16 is easy enough mechanism to determine which directory to use.). In addition of the general answers (basically 'don't bother that much', and 'tune your filesystem', and 'organize your directory with subdirectories containing a few thousand files each'): If the individual images are small (e.g.