Active 6 years, 5 months ago. Viewed 1k times. There's also the convenience of everything being treated like one big drive.
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Using RAID 5 With Your Mac
Unicorn Meta Zoo 7: Interview with Nicolas. Adding hints for including code in questions about scripting. Although RAID 5 can be implemented with mixed disk sizes, that isn't considered the preferred approach since the RAID 5 array size is defined by the smallest disk in the set. RAID 5 arrays use the equivalent of a drive for storing parity, which means the overall array size can be calculated using the following formula:. The d is the smallest disk size in the array, and n is the number of disks that make up the array.
RAID 5 provides for drive failure tolerance, allowing any single drive in the array to fail without losing any data in the array.
When a drive fails, the RAID 5 array can still be used to read or write data. Once the failed drive is replaced, the RAID 5 array enters a data recovery mode, where the parity data in the array is used to rebuild the missing data on the newly installed drive.
Due to the need to perform parity calculations and distribute the resulting calculation, RAID 5 is best when operating in hardware-based RAID enclosures. There are two types of RAID arrays : hardware and software. While a RAID Set of just one drive might not seem very useful — since there would be no other drives with which to share data for improving performance or reliability — this mode, which is referred to as Enhanced JBOD, enables a single drive to take full advantage of the MB read-and-write cache memory on the card. If you're not familiar with RAID terminology, JBOD stands for 'Just a Bunch Of Disks', and refers to a mode of operation where disks are used outside of a RAID configuration such as '0' striping, for performance , '1' mirroring, for redundancy , or '5' a combination of performance and redundancy.
The Mac Pro I was using only came with one drive, so I'm not sure how additional drives are configured when shipped from Apple.
It's probably worth the cost if you want the ultimate performance in terms of number of tracks, and for running virtual instruments that stream samples from disk, but there may be some compatibility issues to consider if you run Pro Tools. Following last month's review of Apogee's Ensemble audio interface, Apogee have released updated driver software that, among other things, addresses two of the specific issues I experienced with the interface: kernel panics when connecting the Ensemble to the Mac, and Core Audio not being able to report the correct latencies to an audio application for offsetting recorded audio.
Since using the updated driver which admittedly has only been for a couple of days at the time of writing I've yet to have an Ensemble-related kernel panic or any kernel panic at all, actually. And upon repeating the latency test in Logic Pro, recording a signal into the Ensemble by looping an output to an input, the latency issue does indeed seem to be resolved. Ensemble users can download the new software from Apogee's web site www.
How to configure a software RAID in macOS Sierra’s Disk Utility | Macworld
This new version supports Euphonix's EuCon protocol for compatibility with Euphonix control surfaces , and also offers OS X-like visual pop-ups when any Ensemble front-panel parameter is changed. To see how many unique audio files could be played back simultaneously, I used Logic Pro 8.
With a drive in regular JBOD mode, Logic was able to play back tracks at the same time, which is pretty staggering, and a significant improvement over the tracks possible with a single rpm SATA drive in the previous generation of Mac Pro. The only down side is that with this many tracks playing back at once, it usually took Logic about three or four seconds to gather the required data before starting playback or locating to a new point in the Project. In other words, I was able to play back tracks at once and still not run into any problems, although the disk performance indicator was beginning to show red peaks.
After reaching the ceiling in terms of the number of audio tracks supported by Logic, it didn't make much sense to try with other RAID configurations.
- Prepping the hardware.
- The New Pegasus RAID System Was Custom Built for New Mac Pro!
- Store your data on a fault-tolerant RAID 5 array!
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- Using RAID 5 With Your Mac;
As we've discussed in previous Apple Notes columns, using RAID in conjunction with audio software rarely gives a significant performance increase in terms of the number of tracks , because although the throughput increases, the seek time remains the same. Where RAID excels in terms of performance, is usually with a small number of bandwidth intensive files, such as HD video, rather than a large number of — by today's standards, at least — low-bandwidth audio files.