Syncplify.me Server!: VFS with quotas

Syncplify.me Server! version: 4.0.0+

The Virtual File System (VFS) instroduced in Syncplify.me Server! v4.0, comes with a long-awaited feature: quota management.

The Windows OS features a very powerful yet complicated quota management, but it’s only available in Windows Server editions and requires optional features to be installed, therefore we could not rely on that and we built our own quota management system which is cross-compatible with all Windows systems.

Now, the problem with quota management is that calculating the current size of a folder (along with its sub-folders) can be very time-consuming, if the folder contains millions and millions of files. So if we were to re-evaluate the size to enforce quota restrictions at every operation it could totally kill the performances. Our solution the Quota TTL, which is the Time-To-Live (TTL) of the quota cache, expressed in seconds. Basically, when Syncplify.me Server! calculates the current size of a folder structure, it will consider such result valid for QuotaTTL seconds, without re-evaluating it too often.

We also support two kinds of quota:

  1. Soft Quota: if the soft quota is exceeded during a file transfer, the file that’s currently being transferred will be allowed to finish uploading, and will be kept; the next file upload will be denied
  2. Hard Quota: when this value is reached, any ongoing upload will be forcefully terminated and the partially uploaded file will be deleted; the next upload will be denied only if the soft quota has been exceeded

You may set limits for soft quota, hard quota, or both. If you don’t want a quota (soft or hard) to be enforced by a certain VFS, then leave its value to 0 (zero).

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