Raid 5 is becoming less viable due to the increasing rebuild times, necessitating raid 1 instead. But new drives have better iops too so maybe not as severe as predicted.
Yeah I would not touch RAID 5 in this day and age, it’s just not safe enough and there’s not much of an upside to it when SSDs of large capacity exist. RAID 1 mirror is fast enough with SSDs now, or you could go RAID 10 to amplify speed.
When setting up RAID1 instead of RAID5 means an extra few thousand dollars of cost, RAID5 is fine thank you very much. Also SSDs in the size many people need are not cheap, and not even a thing at a consumer level.
5x10TB WD Reds here. SSD isn’t an option, neither is RAID1. My ISP is going to hate me for the next few months after I set up backblaze haha
But have you had to deal with the rebuild of one of those when a drive fails? It sucks waiting for a really long time wondering if another drive is going to fail causing complete data loss.
Not a 10TB one yet, thankfully, but did a 4TB in my old NAS recently after it started giving warnings. It was a few days iirc. Not ideal but better than the thousands of dollars it would cost to go to RAID1. I’d love RAID1, but until we get 50TB consumer drives for < $1k it’s not happening.
tbf all the big storage clusters use either mirroring or erasure coding these days. For bulk storage, 4+2 or 8+2 erasure coding is pretty fast, but for databases you should always use mirroring to speed up small writes. but yeah for home use, just use LVM or zfs mirrors.
depends on a lot of factors. If you only need ~30TB of storage and two spare RAID disks, 3x 40TB disks will be much more costly than 6x 10TB disks, or even 4x 20TB disks.
You’d still put the 40TB drives in a raid? But eventually you’ll be limited by the number of bays, so larger size is better.
They’re also ignoring how many times this conversation has been had…
We never stopped raid at any other increase in drive density, there’s no reason to pick this as the time to stop.
Raid 5 is becoming less viable due to the increasing rebuild times, necessitating raid 1 instead. But new drives have better iops too so maybe not as severe as predicted.
Yeah I would not touch RAID 5 in this day and age, it’s just not safe enough and there’s not much of an upside to it when SSDs of large capacity exist. RAID 1 mirror is fast enough with SSDs now, or you could go RAID 10 to amplify speed.
When setting up RAID1 instead of RAID5 means an extra few thousand dollars of cost, RAID5 is fine thank you very much. Also SSDs in the size many people need are not cheap, and not even a thing at a consumer level.
5x10TB WD Reds here. SSD isn’t an option, neither is RAID1. My ISP is going to hate me for the next few months after I set up backblaze haha
But have you had to deal with the rebuild of one of those when a drive fails? It sucks waiting for a really long time wondering if another drive is going to fail causing complete data loss.
Not a 10TB one yet, thankfully, but did a 4TB in my old NAS recently after it started giving warnings. It was a few days iirc. Not ideal but better than the thousands of dollars it would cost to go to RAID1. I’d love RAID1, but until we get 50TB consumer drives for < $1k it’s not happening.
tbf all the big storage clusters use either mirroring or erasure coding these days. For bulk storage, 4+2 or 8+2 erasure coding is pretty fast, but for databases you should always use mirroring to speed up small writes. but yeah for home use, just use LVM or zfs mirrors.
Of course, because you don’t want to lose the data if one of the drives dies. And backing up that much data is painful.
depends on a lot of factors. If you only need ~30TB of storage and two spare RAID disks, 3x 40TB disks will be much more costly than 6x 10TB disks, or even 4x 20TB disks.