Hardware Thread, NAS Server - Ideas? in Technical; Originally Posted by dhicks
Just to update this thread: The BackBlaze Pod 2.0 is now out!
Here are ...
21st July 2011, 12:28 AM #31
Originally Posted by dhicks
Here are a couple of interesting quotes... Proof if you need it, that you shouldn't use Western Digital (or Seagate) HDDs in RAID arrays.
We are constantly looking at new hard drives, evaluating them for reliability and power consumption. The Hitachi 3TB drive (Hitachi Deskstar 5K3000 HDS5C3030ALA630) is our current favorite for both its low power demand and astounding reliability. The Western Digital and Seagate equivalents we tested saw much higher rates of popping out of RAID arrays and drive failure
. Even the Western Digital Enterprise Hard Drives had the same high failure rates. The Hitachi drives, on the other hand, perform wonderfully.
We see fairly high infant mortality on the hard drives deployed in brand new pods, so we like to burn the pods in for a few days before storing any customer data. We have yet to see any drives die because of old age, which will be fascinating to monitor in the next few years. All told, Sean replaces approximately 10 drives per week, indicating a 5 percent per year drive failure rate across the entire fleet, which includes infant mortality and also the higher failure rates of previous drives. (We are currently seeing failures in less than 1 percent of the Hitachi Deskstar 5K3000 HDS5C3030ALA630 drives that we’re installing in pod 2.0.)
21st July 2011, 09:30 AM #32
It's a good point, and the article made some interesting points - like how they yet to have a drive fail due to age. Those Hitachi drives are a bit pricy (£150 each, minimum) but if they aid reliability then they're probably worth it. This thread might give some clue as to the early failure rate of WD drives:
Originally Posted by Arthur
Disk Backup Device
Last edited by dhicks; 21st July 2011 at 09:40 AM.
21st July 2011, 12:00 PM #33
As someone who has been fascinated by cheap storage for many years (Have 25tb+ at home) I love that backblaze company!
Its what I have seen as well, the Hitachi drives I have in 3tb versions are rock solid.
Western digital has a near 20% failure rate for me and I will never buy their drives again. Lesson Learned!!
21st July 2011, 01:10 PM #34
Have Hitachi finally exorcised the ghost of the Deathstar now in that case? Always used to be very suspicious of any drives with the IBM "heritage"
So we've got Seagate (old Maxtor) and now WD that have question marks over reliability. If Samsung do sell up as suggested they might who can you trust to make a decent quality HDD these days?! Seems like they're doing their level best to help out the SSD manufacturers at the moment
This does raise questions about disk backup though with many people using these grades of drive, with some of the failure rates being experienced is anything less than RAID6 a bit of a risky proposition bearing in mind the size of arrays needed for 14-30 days of disk backup retention?
21st July 2011, 01:29 PM #35
WD are in the are/have aquired hitachi, im a fan of WD drives as not had a major failure which has caused any data lose.
i think in the next few years there will just be WD and Seagate left in the consumer mechanical drive market
21st July 2011, 02:19 PM #36
Must admit I'm very impressed with what these guys are doing, the costs they're achieving are incredibly good! I'm about to do one for us on a much smaller scale - SuperMicro chassis, RAID card, 8x 2TB disks.
Originally Posted by dhicks
21st July 2011, 02:56 PM #37
To be fair, that article does seem to be saying that disk failures tend to happen early in a drive's lifetime - either the disk has an issue and conks out soon after you install it or it doesn't and runs for years. Also, drive manufacturers seem fine about replacing faulty disks still in garuntee, so there's no real cost involved in a faulty drive.
Originally Posted by gshaw
It should be emphasised to those looking for a backup solution that the hardware we're talking about here doesn't neccesarily provide much by way of fault tolerence by itself - Backblaze have their own software that would seem to provide redundancy accross multiple hardware units, and they are operating at a seriously large scale. They simply build systems to expect and handle drive failure.
Peter Hopton's comments in the thread I linked to above make sense - on today's large disks, reading the whole disk stands a good chance of hitting an error, so if you're relying on a single disk to restore your RAID-5 array you might be pushing your luck - RAID 6 would seem like the senisble option these days for any larger array.
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