Asklemmy

Yeah and Titanic was unsinkable.

If the controller in your SSD fries, it doesn't matter how many unused gigabytes your SSD has got for relocating bad sectors. It is still fried. For you, that data is forever gone.

This is why you have redundancy. Full redundancy. You can go for RAID1, one disk die and you still have no data loss, or go bananas with RAID6, two full disks can die and you're still going strong.

Ps. Spinning harddrives have had hidden sectors used for relocation of bad sectors for ages. It's nothing new. If you have to much time on your hand, Google harddrive hidden sectors nsa.

Unlike hdd, I never experienced graceful disk failures on ssd. Instead, they just randomly decided to die at the most inconvenient time. Raid 1 saved my hide a couple times now from those ssd failures.

…absolutely, positively, super false. I work in a sector where we’re constantly dealing with huge capacity enterprise SSDs - 15 and 30 terabytes at times. Always using RAID. It’s not even a question. Not only can you have controller malfunctions, but even though you’ve got what’s known as “over provisioning” on the SSDs, you still need to watch out for total disk failures!

SSDs still have component bottlenecks that can kill the whole drive, same as hard drives.

Also, 3-2-1 is far superior to RAID, but having RAID on top of that is nice.

• Maintain three copies of your data: This includes the original data and at least two copies.
• Use two different types of media for storage: Store your data on two distinct forms of media to enhance redundancy.
• Keep at least one copy off-site: To ensure data safety, have one backup copy stored in an off-site location, separate from your primary data and on-site backups. https://www.veeam.com/blog/321-backup-rule.html

Reminds me of the days that cdroms were brand new and advertised like indestructible, with photos of elephants walking over it. Having said that I assume SSD disks can break like other hard disks can break, and in that case RAID can save a lot of time to get a computer back up especially when a lot of data is involved.

This is a total load of bullshit, your friend is wrong

you can replace sectors within them if a problem occurs

That won't help you if sector where your data is located dies!

its not about the individual drive... its about total drive failure.. if that ssd's controller dies it doesnt matter if it has extra data sectors.

that said, I moved on from raid by mirroring multiple , unraided NAS devices for redundancy with data stored specifically on the drives in such a way as to eliminate cross disk logical volumes.

I don't think the internal wear-leveling and overprovisioning of SSDs can or should be able to replace raid. Disregarding a dead sector without losing capacity is great, but it won't help you when (for example) the controller dies.

Depending on the amount of data you're storing SSDs also might be too expensive.

The only exception is maybe Raid 0 in a normal PC. Here it's probably better to just get one disk for each logical drive.

• Bit rot is still a problem, you need a high integrity file system and or RAID to avoid that
• Full drive failure is still about as likely, IE the main reason for RAID of multiple drives in the first place.

A good read on the problems with SSDs SSD 101: How Reliable are SSDs?

I do recall google apparently stopped using raid in some data centres, but it was because they had whole-machine redundancy.

RAID is probably redundant for some of the uses it used to have, like optimising read performance by using many drives (SSD is fast) and honestly I suspect that SSDs are probably more reliable as they don't have a bunch of platters and bearings and screaming rotational speeds.

So if you needed it for a base level of reliability, an SSD on its own may have exceeded that.

I suspect there are still uses for drive redundancy in some high availability setups.. although your friend might be right. If the likelihood of drive failure is lower than other parts in the machine and you need high redundancy for availability it might make more sense to replicate the whole machine rather than the drives.

It's possible redundancy specifically for the drives was an artifact of unreliable drives back in the day 🤔 they might have a point! I think it's likely still useful at times though.

I'd rather hotswap a drive than set up a new server, even if it's a less likely scenario.

I wholeheartedly agree with you. It is worth noting that a lot of the use cases of RAID can now be solved via software, but there are some places where hardware RAID still shines, such as redundancy. Yes, software also can provide redundancy, but I still haven't seen a software solution that is equivalent to a proper RAID controller with a dedicated battery to keep the I/O buffer alive in case of hardware failure. That one has saved me a few times.

Source: I'm in charge of 6 storage clusters at work. Beegfs is what takes care of the actual clustering, resulting in each cluster clocking in at 1.2PB of storage. Each cluster consists of four machines with three storage volumes each.
Each storage volume consists of 12 drives in a RAID6 configuration.

I can yank faulty drives and toss them out and have them replaced with no downtime. I know some like to set up hot spares, but I for one don't. I've even had entire servers die on me, and thanks to additional redundancy provided by beegfs, I've changed motherboard with no cluster downtime either. Just move the drives over to an identical machine (yes, each cluster has a dedicated spare machine), import the RAID, and you're good to go.

Higher end Samsung ssds were dying a lot faster than they should. I dont know what drugs your friend is on thinking they cant fail but theyd better have enough for the rest of the class.

He said it was due to how big SSDs have gotten and that apparently you can replace sectors within them if a problem occurs which is why having an array is not needed.

Buying SSDs with the same capacity as my NAS with 70TB (after raid 6) would cost almost tripple of what my setup (including the NAS) costs.

So unless you shit money, SSDs are not an option for anything with a decent capacity.

due to how big SSDs have gotten and that apparently you can replace sectors within them if a problem occurs

True, but that's something an SSD does internally and is just there to prolong the lifespan.

You definitely still want a raid if you want to keep a system running during a disk failure. No amount of extra sectors and wear leveling will safe you from that

This has nothing to do with ssd or their size. Harddisks also have a little spare area (though not as big) and can mark and remap failing sectors.

RAID (1) is still (possibly) good for the only thing it ever was (possibly) good for: Keeping the system running long enough for you to put in a new harddisk if one fails.

Think of industrial systems where every minute of downtime can cost thousands of dollars. And even there the usefulness of RAID can be questioned: should you not in that case have a whole spare system, easy to swap in, because more than just storage can fail?

And what about the RAID controller itself? Does it not add complexity and another point of failure to the whole system?

And most importantly: will anyone actually get notified of a failing disk and replace it quickly? Or will the whole thing just prolong the inevitable?

Would you even trust a system that had one disk fail already to keep going in a critical place? Or would it not be safer to just replace the whole thing anyway after one failure?

Raid often comes with snapshots which can recover from your mistakes. Often the raid can even recover after malware encryhts your disk. you still need offline, offsite backups for the best protection but raid is still a useful part of your data safe

Is your friend going to pay for enough SSD’s for me to store my 60 TB of data?

I'd say "old" RAID could be dead if you have proper backups and have the ability to replace a defect drive fast in the case uptime is crucial. But there's also modern RAID like btrfs and zfs that also can repair corrupted filed, caused by bitrot for example. Old RAID can't do that also hardware based RAID couldn't either when I used it until years ago. Maybe that changed but I don't see the point of hardware based RAID in most cases anymore

SSDs man, I personally still don't trust them for primary storage. My data array is unraid, several spinning disks. Spinners just always work for me, there are gotchas of being jostled or turned off incorrectly, but if you treat them well they'll last a real long time. Plus the double redundancy of my array and I'm very happy with it. (Plus I don't see 20TB ssds on the market for 300 bucks either).

SSDs though wear out, they only have so many IOPS in them. I had some in a traditional raid and it just ate through them. Too many writes and I had 5/6 fail on me. I use them now as cache drives, for unraid you can set a faster drive to store data temporarily, and then it will move it off the cache drive later onto the main array, and that's a level of risk I'm happy with.