Ugrading to 10 TB drives

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ROLLINS
Getting the hang of things
Posts: 81
Joined: Tue Oct 14, 2014 10:42 pm

Ugrading to 10 TB drives

Post by ROLLINS » Fri Nov 09, 2018 3:26 am

I am using raid 5 with four 5 tb drives.Any idea How long will the rebuild take?
I still have almost 3 tb before i run out

dolbyman
Guru
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Location: Vancouver BC , Canada

Re: Ugrading to 10 TB drives

Post by dolbyman » Fri Nov 09, 2018 4:10 am

depends on disks (new and old) and device speed

could take anywhere from <20 hours up to several days per disk, and the subsequent expansion will also take some time

ROLLINS
Getting the hang of things
Posts: 81
Joined: Tue Oct 14, 2014 10:42 pm

Re: Ugrading to 10 TB drives

Post by ROLLINS » Fri Nov 23, 2018 2:50 am

Oh ok, that's a long time where anything can happen

kherr4377
Been there, done that
Posts: 886
Joined: Mon Jun 03, 2013 3:33 am

Re: Ugrading to 10 TB drives

Post by kherr4377 » Tue Nov 27, 2018 8:33 am

I always opt for a fresh start, restoring from backups. less wear and tear on the drives, especially the ones your replacing ...
Production :
TVS-673 4.3.4 0387
4 X 3TB WD RED : 1 X 4TB HGST DESKSTAR R5
32GB
LAN-10G1SR-D, FiberHal for Cisco SFP-10G-SR
NETGEAR ProSAFE SS3300-28X

Backup :
TS-469L 4.3.4 0387
4 X 3TB WD RED R5
3GB
Located detached garage .. cheap offsite solution ...

2nd TS-469L awaiting drives and reassignment for front-line duty .......

ROLLINS
Getting the hang of things
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Joined: Tue Oct 14, 2014 10:42 pm

Re: Ugrading to 10 TB drives

Post by ROLLINS » Thu Jan 10, 2019 4:56 pm

Yea that's the thing i never did get around to having complete back,think i will do the rebuild one every couple of days

P3R
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Re: Ugrading to 10 TB drives

Post by P3R » Thu Jan 10, 2019 11:29 pm

ROLLINS wrote:
Fri Nov 23, 2018 2:50 am
Oh ok, that's a long time where anything can happen
Let's say that a disk replacement takes 24 hours, that's a very insignificant time in relation to the normal limetime of a disk. Therefore I'd say that the rebuild time, as long as it's not counted in many weeks, contribute very, very little to the risk for a faulty disk.

During a rebuild all other disks need to be read, every byte from start to finish. If that complete read is done over 10 hours or 100 hours doesn't really matter. It's much more likely that the disks have already developed a problem (that you will be made aware of during the rebuild) than that the complete read itself is causing the problem.

Other than the performance degradation (which in some professional applications can be a huge problem) the issue with long rebuild times is mostly that administrators are so worried about them when their worries should be elsewhere.

If you've done the recommended regular RAID scrubbing, the risk for a failure during the expansion is very small. If you haven't done RAID scrubbing, there's a higher risk but the rebuild time is extremely unlikely to affect it.

What you should worry about is your lack of backups, that's a much worse risk and that exist now even before you start the rebuild.
RAID have never ever been a replacement for backups. Without backups on a different system (preferably placed at another site), you will eventually lose data!

A non-RAID configuration (including RAID 0, which isn't really RAID) with a backup on a separate media protects your data far better than any RAID-volume without backup.

All data storage consists of both the primary storage and the backups. It's your money and your data, spend the storage budget wisely or pay with your data!

CiASpook
Know my way around
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Joined: Mon Mar 22, 2010 7:07 am

Re: Ugrading to 10 TB drives

Post by CiASpook » Fri Jan 11, 2019 1:07 am

I have done this prosedure many times over the years. From 8x 2TB -> 4TB -> 6TB -> 8TB -> 10TB and migrated from several systems by moving drives. Never failed. But when I went from 10TB -> 14TB I had to do a data migration due to I had to upgrade filesystem to be able to use Qtier. So I scratched my setup and restored everything from backup. Took some time. At 99,96TB usable space now.

Another thing do consider as your drive sizes increase and subsequently rebuild times also you should consider RAID6 for critical data.

But, always have good backups.
QNAP TVS-1282T3-i7-64G with 8x Seagate Ironwolf 14TB, 4x Samsung 860EVO 4TB, 2x Samsung 860EVO 2TB M.2, custom with Corsair H5 SF watercooling, Corsair SF450W PSU and Noctua NF-8A PWM 80mm fans. QTiering and RW Cache.

ROLLINS
Getting the hang of things
Posts: 81
Joined: Tue Oct 14, 2014 10:42 pm

Re: Ugrading to 10 TB drives

Post by ROLLINS » Wed Jan 23, 2019 1:11 am

First one took 11 hours, then i went in change the priority, rest took 9 hours

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