Kevin Patrick
Forum Replies Created
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Caldigit makes some pretty good products. In the short time I’ve used them (AV Pro), I’ve been very happy with the performance and reliability. I do believe you get what you pay for. I will most likely wind up getting their T3 for many of the same reason you list. Plus it’s Thunderbolt, which keeps USB 3.0 ports open.
I’m sure lots of people are quite happy with OWC products. I however have one of their eSATA RAID products that developed an issue that would not allow me to write to it any more. Neither I nor OWC could figure out why. So I moved on from OWC to Pegasus2.
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I just realized I did a poor job of posting my question.
Which brands of LTO media? Not drives, or SW.
I’m looking for recommendations for the LTO media.
(sorry)
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Chris,
Another thought I had is that I’d like to use the RAID array for Time Machine backup, without partitioning.
It’s my understanding that I can limit the size of a Time Machine backup by using sparse image bundles. (set the size limit to something like 1.5 x what I’m backing up)
Do you have any experience with this setup?
Any concerns having sparse image bundles residing on a array?
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[Chris Murphy] “scrubs weren’t scheduled”
I’m not sure what a scrub is. Both the definition and how that translates to the features of a Pegasus array. The background activities that are available for the array are:
Media Patrol: Default on. This appears to check media, not data. If a media error is encountered, it triggers PDM.
Redundancy Check: Ensures all data matches exactly. Settings for Low, Medium and High. Balancing system resources vs. r/w operations. Options to Auto Fix or Pause on Error.
Synchronization: Recalculates redundancy data on physical drives to ensure sync. Settings for Low, Media and High.[Chris Murphy] “drive and controller timeouts weren’t set correctly”
I’m not sure this is even a setting for the Pegasus unit. (unless I missed something)
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[Chris Murphy] “So why is it that raid5 instances are having so many unravelings? Because they’re configured wrong. “
The Pegasus unit does have controller settings, but they don’t offer much explanation about the settings, nor any recommendations. The options are:
SMART Log: On or off
SMART Polling Interval: 1 to 1440 minutes
Enable Coercion: On or off (I believe this is for mixed drive capacities)
Coercion Method: GBTruncate, 10GBTruncate, GrpRounding, TableRounding
Write Back Cache Flush Interval: 1 to 12 seconds
Enclosure Polling: 15 to 255 seconds.Are these the kind of settings you’re referring to? I believe these are the only controller settings.
I contacted Promise, but only talked briefly with sales. I will be trying to contact their tech support tomorrow to get some more information.
I guess I should be glad my Mac Pro won’t get here until February, so I can spend the time fully understanding the Pegasus array and it’s options. As opposed to plugging it in and happily running away with a complete lack of RAID knowledge.
In case I forget, thanks Alex, Chris and Eric for all your comments and advice.
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Chris,
It sounds like you’re suggesting RAID 5, no hot spare. Correct?
In my limited RAID experiences, I’ve never had a hot spare. But I thought a hot spare would be better than a cold spare. Aren’t HDDs happier when they’re spinning? They’re designed to spin, not sit, right?
Although, I think I understand the reasoning behind not having a hot spare, since you can manually control when and if the array is rebuilt. (as Alex points out)
Still, wouldn’t it be better for the drive to be sitting in the array, always up and running? I could use still use that single HDD for other purposes. (maybe cloned backups of my boot drive?) If a drive fails, shouldn’t I be able to turn that extra HDD into the replacement HDD?
Wouldn’t RAID 5 (7 drives) plus scratch drive (to be used as spare if/when needed) be kind of like RAID 6, but with a benefit of using the non-Array drive for other purposes until it’s needed to rebuild. Plus, I’d be running at RAID 5 performance the entire time.
Also, why RAID 10 over RAID 6? RAID 0+1 or 1+0?
My understanding is that RAID 10 can recover from 1 drive failure per span. With an 8 drive array, that would be two spans, so it could recover if you lost one drive from each, two drive failure. But I guess you could loose more drives on one span and still recover, assuming you lost no drives on the other span. Correct?
Is RAID 10 faster (write) than the overhead required for RAID 6, with 8 drives and no spares?
Kevin
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4K requirements seem to be a little vague. The dual GPUs seem to be for effects and rendering.
Yet when the talk about 4K playback, they talk about both CPU and GPU. (unless I missed something) So, I hope you can get some more real world data to help make your decision. 6 or 8 cores, it’s an expensive box. Upgradable or not, it’s even more expensive.
Either way, I guess it’s a nice first world problem to be finally worrying about which new Mac Pro to buy. As opposed to wondering if there ever will be a new Mac Pro.
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If I understand correctly, it appears they are suggesting that an 8 core model is the best option for FCPX. Turbo mode will provide similar single core performance to the 6 core, while the extra 2 cores will be used up by the latest version of FCPX.
Is that how you see it?
Or are the extra cores only being utilized when you are editing more demanding 4K media?
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I just checked Apple’s site. The above configuration is showing a ship date of February.
It was January when I first looked this morning.
I guess there is still a demand for “pro” level systems.
Who knew.
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Is the flash storage upgradable? I didn’t think it was.