expiredKitto posted Oct 12, 2023 11:48 AM
Item 1 of 2
Item 1 of 2
expiredKitto posted Oct 12, 2023 11:48 AM
18TB Toshiba 7.2K RPM SATA 6Gb/s 4Kn 3.5" Hard Disk Drive
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During the rebuild RAID controller need to read the all data from all the remaining disks in the array to be able to recover the lost data onto the hot spare disk. This rebuild process is also known as resilvering. If, at any moment of the rebuild process, the RAID controller fails to read the data it will halt the resilvering and the array will be left in unusable state, which practically means all your data is lost. Yes, one bad block can invalidate your 50TB RAID 5 array.
So, what are the chances to face this issue? Most manufacturers say that you should expect at least one Unrecoverable Read Error (URE) every 10^14 bits for commodity hard drives. For enterprise level disks these chances are slightly better – one error per 10^15 read bits. Converting this number to terabytes we should expect 1 URE per each 12.5 TB and 125TB reads accordingly.
The magnetic hard disks have grown in size tremendously over the last decade and became very affordable. I just checked the prices on eBay – you can buy 10TB drive for only $400.
So, if you blindly follow these numbers your RAID 5 array of 5 x 3TB disks has almost 100% chance of URE during the rebuilding process.
On top of that you can add the higher chances of the second drive failure before the failed data is rebuilt. Which makes RAID5 very impractical in large arrays.
I'm not sure, but my little research indicates this.
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I'm not sure, but my little research indicates this.
Wonder why SPD is only offering a 3 year warranty of the Toshiba when the manufacturer (that they ultimately fall back on) offers 5 years for this model.
When you receive a HD from SPD, is there any way to confirm you got a new HD vs. a repackaged one? Perhaps looking at the SMART info or that could be reset too (like rolling an odometer back)?
The available quantity of WDs has stayed around 200 for the last hour. Either they keep adding more inventory or they are selling VERY slowly. I assumed the WDs would sell out in minutes. This seems like a good deal but I'm getting worried now.
Tempted to buy the 18TB X18 Exos drive for $209.99.
That WD drive has a 5yr warranty from the mfg.
I'm disappointed we have to go through SPD for warranty issues. If SPD goes out of business (I have no idea if they are a big or small company), would WD take care of us within the 3 years or we'd be SOOL?
When someone gets 1 of these new WD HDs, what does it say when you look up the serial number on WD's warranty check?
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That WD drive has a 5yr warranty from the mfg.
These "new" might not be as new as they say. Maybe they were cold spares that were sitting in a datacenter? Or part of a system build that was pulled, so the warranty is to OEM?
I don't know - but not worth the hassle.
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