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Forum Discussion
Seagate 8TB Archive drives (ST8000AS0002) do work
Just thought I'd pass along in case anyone was curious of the 8TB drives work or not. So far in testing a Pro 6 and an Ultra 6 I have 3 8TB drives in the pro 6 and 2 in the ultra 6 (with another one ...
ifixidevices wrote:
You have no real world experience Stephen unless you have SMR hard drives. You're just spouting what you've heard and read about.
Let's be careful to stop short of personal attacks. The tone of your recent posts are nearing that line. I have no issue with your use of these drives, and I think is it useful for you to share your experiences here. I'd prefer more measurements/hard data than I've seen so far. But I also think its important not to encourage the community as a whole to blindly buy these drives and put them into their NAS. If someone thinks through the implications, and buys them with their eyes open, then that's fine.
It is true that I do not own an SMR drive - because I researched its characteristics, and studied reviews of its performance. Then I decided that it wasn't the right drive for my NAS right now (given the way I use them). I see nothing wrong with that approach. I read up on most things before I buy them.
And referring people to reviewers who have measured the performance of these drives and published their results seems very sensible to me. This one for instance: http://www.storagereview.com/seagate_archive_hdd_review_8tb. The "Raid Usage" section is quite informative and grounded in measured data.
powellandy1 wrote:
The problem is definitely with 6.4.x.
They apparently made some changes to try to deal with SMR drives better. It might be hard to tell if the issue is inherent to the new kernel, or if they made a mistake in their changes. The OS is running on these drives, and log writes (like all other writes, including swapping and ReadyNAS database updates) will ripple. Even if the boot drive is traditional, the OS is still mirrored across the SMR drives.
powellandy1 wrote:
Copying was very slow (but I suspect this was, as StephenB says, due to the drive internally re-writing to the end of the disk) but no more drops/command timeouts.
Adding a 3rd 8TB to the JBOD structure and copying another 6TB was suprisingly fast, only 48h. Whilst it will never be as fast as a NAS 7200rpm disk, it's not bad at all.
The drive does have a very large cache, and the firmware is designed to use it to mitigate the impact of the rewriting as best it can. Based on the review measurements, the consequence of using these drives is that when rewriting is needed the sustained transfer speed varies widely from ~10 MB/s to ~150 MB/s. It can stick at ~10 MB/s for quite a while.
Despite allegations that I simply "bash" these drives, they do have their appeal. They are the only affordable 8 TB option I know of (and at ~$32/TB, they are 20% cheaper than WDC Reds per TB). They could be suitable for future use in my backup NAS (which I have switched to run jbod).
However, I do want to keep snapshots on in the backup shares, and I am concerned about the potential impact on rebalancing time (after snapshot deletion), and other volume management functions - defragmentation time, and scrub times. At ~10 MB/sec speeds, they could take a week or more. The impact of apps (particularly plex, with its database) on the transfer speed is also a concern. I am running plex on a backup NAS today.
If you have data on volume maitenance functions (particularly after deleting a few hundred GB of snapshots) that would be interesting.
I'm just going to be done posting on the forums. In almost every post I read pertaining to the archive drives you have a negative tone towards using them and that the world will come crashing down if you put them in raid. I'm sorry to tell you it hasn't and it won't.
Anyway there's no point in bothering to express views or help others when there's a heavy bias towards the netgear agenda. Don't buy off of the non HCL list, or better yet just buy a readynas that's populated with drives and spend like 3x as much as if you bought them yourself.
Then there's the matter of how hard you guys rally against downgrading when people were having serious issues. People upgraded production units because new non-beta firmware comes out that causes severe headaches and there's a solution (albeit a lot of work) and you suggest no just wait, put up with the lockups or not being able to use your device as it was intended and the features that were working fine before please stop using them until we can fix it (btw we have no idea how long it will take.) And now we've got a beta that should fix it all, or at least we hope so! Definitely put a beta version on over downgrading!
It's fine, I can't take the constant arguing anyway. Look at any post of mine or any post anyone metions about the 8TB drives and look at how fast you show up in that thread saying they're a bad idea. That's fine. I told people my experience as well but after every statement I make about the performance I experience with the drives and that they are not as bad as you're making them out to be, you come back saying but look others are having issues and I've read up about the technology so I know they just aren't going to be good! I think people are buying these with the expectation that they are going to be like any other hard drive and they are not. But for what I've been using them for (time machine backups on clients macs, my personal macs) having IPSW's for iphones and iPads stored and ready to go, storing ISO's and installers of OS X and Windows), parallels VM's, my wife's photography business backups, itunes collection backups, customer file backups and everything else I do with them I've had absolutely no problems. Slower yes, but unbearably slow... no. For the price point they are unbeatable. I've got over 35TB's of space with redundancy for under $1200.
Anyway that's enough. All I was trying to do was say it's ok to try them and see if they stand up to someone's performance level. Worst case scenario you can always resell them on eBay for pretty much what you paid for them.
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