can you reformat a promise pegasus2 r6 from mac to pc

The Promise Pegasus2 R2+ ($749) is a versatile desktop-class external hard drive for both Macs and PCs, with a built-in two-bay RAID array. Best Hosted Endpoint Protection and Security Software.I didn't test the R6, but I wouldn't be surprised to see similar behavior on that chassis.īesides the problem of RAID 5 sync performance, regular Pegasus R4 performance in RAID 5 was excellent. For several Adobe Lightroom tests, I/O size varied from 256k to 512k, indicating either of those stripe sizes would be better than the default of 128k. You can very roughly approximate the I/O size of a given workload by using Activity Monitor, and dividing bytes per sec by IO per sec. In general a larger stripe size is better for images and video. Larger strips are more efficient for large I/O sizes. Smaller stripe sizes are more efficient for small I/O sizes, with less wasted 'slack space'. Stripe size is the amount of data 'striped' in a single I/O across all drives in the array. Three different R4 chassis were tested on two different iMacs, and two different sets of 4 x 2TB drives, with consistent results. This is not documented in any Promise articles or manuals. For 512k stripe size, sync time is about 10 hours. Using the provided Promise Utility to select a 256k or larger stripe size reduces sync time considerably. The default stripe size is 128k, which produces a sync time of 90+ hours. Supposedly this takes 10-15 hr, but some users report 60, 70, or 80+ hours.įinding: RAID sync time is directly related to stripe size. Problem: before it can be fully used, the Pegasus R4 in RAID 5 must undergo one-time 'synchronization', whereby RAID data is written to all drives in the array. However I also did regular performance tests. My main priority was isolating the huge variations in RAID synchronization time reported by different users. Config = 4 x 2GB Toshiba 7200 rpm SATA drives, unformatted capacity = 8TB, RAID 5 formatted capacity = 6TB. I've done extensive performance tests on the Promise Pegasus R4 Thunderbolt disk subsystem.

Can you reformat a promise pegasus2 r6 from mac to pc