In video work, RAIDs are used to increase speed, not necessarily size, and rarely for backup.
>From http://digitalcontentproducer.com/hdhdv/depth/video_hdv_real_world/ : > A RAID is required because, for example, 1080i video requires a data > transfer data rate of 124MB per second. In fact, a very large RAID is > required because an hour of 1080i requires 448GB. Moreover, this is > using uncompressed 8-bit video. These values increase — for 1080i, to > 166MB per second and a whopping 597GB per hour of footage — were you > to digitize to 10 bits. The article is 3 years old, but today's high end SATA drives still top out at ~120mb/s, not leaving enough overhead for capturing without dropped frames or for smooth editing and playback. Theoretical SATA speeds are much higher than that, but those are future solutions. Of course, there are ways to edit HD without a RAID; specifically, by using an IC (intermediate codec). An extra step many are willing to take. On Sun, Aug 31, 2008 at 9:02 PM, Tom Piwowar <[EMAIL PROTECTED]> wrote: > For video work, with high-transfer rate, 1TB SATA drives selling for > peanuts, there is little reason for using a RAID. A TB is more than > enough to store 3 hours of uncompressed 24p 1920x1080 (HD) video. With > storage virtualization/replication you can span multiple physical volumes > to create larger virtual volumes. So there is no need to bother with > creaky old RAID. ************************************************************************* ** List info, subscription management, list rules, archives, privacy ** ** policy, calmness, a member map, and more at http://www.cguys.org/ ** *************************************************************************
