I have a couple of raid enclosures, with a total of about 21 TB usable (RAID5) in a W2K8 environment. I would like just a single virtual volume spanning the physical devices, but it is my understanding that the NTFS volume size limit is 16 TB. Is this a hard constraint or a MSFT recommendation? What is my exposure if I go ahead and roll the bigass 21 TB volume? Thanks!
In Windows 2003, 232-1 clusters. With 64k clusters = 256TB
With full 264-1 sizing, 256 TB * 256 TB
21 TB is a rounding error, quite frankly
Just to clarify, the maximum file size is 16 exabytes architecturally and 16 terabytes in implementation. The maximum volume size is 256 terabytes.
Basic volumes are limited to 2 TB. Even if you create multiple volumes on a single logical unit, the combined size of all those volumes cannot exceed 2 TB. If you want to use volumes larger than 2 TB, you must use dynamic spanned, striped, or RAID-5 volumes.
Dynamic disks allow you to create spanned, striped (RAID-0), and RAID-5 volumes that exceed the 2-TB size limit of basic volumes. Simple and mirrored volumes cannot exceed 2 TB.
For more information:
Microsoft said in 2005 that the real limit for a spanned NTFS filesystem was 64TB on their "Storage Fact and Fiction" page.