USB Storage support

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smitty16
DD-WRT Novice


Joined: 25 Feb 2017
Posts: 18

PostPosted: Sun Sep 15, 2019 14:44    Post subject: USB Storage support Reply with quote
Hello Community,

I've a General Question which I can't find an answer for Rolling Eyes. Can anyone tell me, wether DD-WRT supports usb storage devices with partions on it larger than 16TB in size? Thank you very much
regards
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jxm
DD-WRT Guru


Joined: 23 Jul 2017
Posts: 710
Location: Brisbane, Australia

PostPosted: Mon Sep 16, 2019 0:38    Post subject: Reply with quote
Does it matter? The biggest USB drive on the market is 5TB. The largest drive available right now is a 15TB device designed to fit in a data centre rack, it would be pretty ugly trying to connect it via USB.

Cheers
smitty16
DD-WRT Novice


Joined: 25 Feb 2017
Posts: 18

PostPosted: Mon Sep 16, 2019 7:08    Post subject: Reply with quote
@jxm

thx for your reply, but in case your answers only consist of counterquestions then you should keep your breath and keep them by yourself. It was a simple Question, and if you don't know the answer, why not simply keep silent then Question Besides my usb drive I'm Talking about is a raid 5 drive with about 30TB. So Long ...
Wildlion
DD-WRT User


Joined: 24 May 2016
Posts: 465

PostPosted: Mon Sep 16, 2019 22:44    Post subject: Reply with quote
DD-WRT supports ext4, so in theory it should be able to.

Have you tried it?
kernel-panic69
DD-WRT Guru


Joined: 08 May 2018
Posts: 1993
Location: Texas, USA

PostPosted: Tue Sep 17, 2019 1:17    Post subject: Reply with quote
Wildlion wrote:
DD-WRT supports ext4, so in theory it should be able to.

Have you tried it?


Not across the board. Depends on the device and flash size.
smitty16
DD-WRT Novice


Joined: 25 Feb 2017
Posts: 18

PostPosted: Tue Sep 17, 2019 6:17    Post subject: Reply with quote
thank you very much for your answers. Yes of Course I tried ext4, since ext2/3 are not even able to grow above 16TB. ext4 does if the filesystem is set to 64bit (4K Blocks) with e2fsprogs and resize2fs. I could get e2fsprogs with entware tuo my DD-WRT (v3.0) and I could even prepare the filesystem within DD-WRT (ssh) this way, but when I try to mount the Partition I get the message 'filesystem too large'. Maybe it's the Linux kernel or the processor of my router (ARMv7), I don't know but it seems to be not possible. But anyway, thank you very much for your inouts.

regards
Wildlion
DD-WRT User


Joined: 24 May 2016
Posts: 465

PostPosted: Wed Sep 18, 2019 0:42    Post subject: Reply with quote
@kernel-panic69 very true, do not disagree

smitty16, sorry that it does not work, would have to dig through the code itself to see if it is limited somewhere.
d0ug
DD-WRT Guru


Joined: 31 Jul 2015
Posts: 760

PostPosted: Wed Sep 18, 2019 4:33    Post subject: Reply with quote
I honestly could not imagine putting that much storage on a USB link on a router with what is a technically BETA experimental firmware. I'd be worried day and night about that data just not being there some day.

If you want to put that much storage on a NAS, do yourself a favor and buy yourself a QNAP or Synology NAS. Even a used one off ebay from a few years ago for a few hundred dollars will run circles around a router based hack, offer more features, performance and stability in both the software and hardware. Why spend that much money on the disks to just have it all hanging off a usb port based hack?

And no level of RAID is going to save you in the case of some firmware bug totally trashing your file system. The RAID controller in that USB attached storage will happy write whatever garbage a firmware bug tells it to all over those disks totally trashing the data on them. If it even contains a real hardware RAID controller. A lot of those types of storage systems are simply a USB to SATA bridge with a port multiplier, relying on a proprietary driver or the OS to handle the RAID in software.

Even the QNAP / Synology SOHO type devices do not have a hardware RAID controller in them. They're doing linux software RAID. You're not likely going to be seeing real hardware RAID until you get into rack mounted storage solutions that cost in the double digit thousands of dollars.

RAID is not a backup! It is meant for either increasing performance or availability depending on the level of RAID chosen. RAID won't save you from the OS, a bug, or some malware writing all over your precious data, or a power surge nuking more than one of your drives.

I myself have two identical QNAP 4 bay devices. Both are set up identically with a total of 16TB of disks per NAS using RSYNC to sync the data changes from the master NAS to the mirror NAS nightly. If one of those NAS devices totally dies, or a disk dies, I don't have to sit there on pins and needles worrying about the rest of the RAID 5 array dying during the rebuild process, which is has been a high probability for some time with the increase in disk sizes over the years. The eventual plan is for my mirror NAS to not even live in the same house as the primary one. I have already tested having the mirror device at a remote location with the mirror device VPNed back to my home network and then rsyncing over the VPN tunnel.
scar1943
DD-WRT User


Joined: 10 Nov 2018
Posts: 183
Location: South Carolina

PostPosted: Mon Sep 23, 2019 14:41    Post subject: Reply with quote
kernel-panic69 wrote:
Wildlion wrote:
DD-WRT supports ext4, so in theory it should be able to.

Have you tried it?


Not across the board. Depends on the device and flash size.


Folks,

I also, would like the know the answer as well. Its an interesting question.

I use the USB port and external drive for assorted non-critical backups. Video game saves, assorted OS images, ancient useless software that I can't seem to toss. Sorta' makes me a data hoarder. Wink

Anyone discover a limit (other than the grueling USB lack of speed)? I'm going to assume the limit is the file system limits, not due to the firmware?
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