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Bruce n Philly
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Re: Which HDD's for backup.


js47 wrote:

But why use RAID0 instead of JBOD? Especially with SSDs you are doubling your risk while getting the same capacity and the same read/write speed. With HDDs at least you get improved performance — still not worth it though.

Edit:
- If you have two 4TB drives in RAID0, you get 8TB of usable space. But if either one of those drives fail, you lose all data on both drives since in RAID0 part of every file is on both drives but no single file is on a single drive. For 2 drives in RAID0 you typically will achieve 2x the read and write speeds of a single drive, but this is largely irrelevant for SSDs.
- If you have two 4TB drives in JBOD, you also get 8TB of usable space. But if either one of those drives fail, you only lose the data that was on the drive that failed.



Coupla things...

First, let's keep to internal storage in a PC. JBOD, aka just a bunch of disks, are just single disks with their own drive letters. Nothing wrong with this, but I had a small stack of SSDs sitting around of 1 gig each. If you have the available SATA ports available on your mother board, I think it is really convenient to configure them as one RAID 0 disk as you have only one drive letter and a slight increase in performance. I use this as a kind of a scratch drive for storing photos right off of my cards and then cull them from there. I also have a few folders of static files on this RAID array. Given that I back up my system regularly, I am not worried if this RAID 0 craps out. The static folders can be recovered from my NAS and the photos, while very inconvenient, can be re-read from my camera cards (or from my NAS if I ran the backups). I never delete my photos on my camera cards until I head out the next time thus having a temporary backup if needed. BTW, I never needed it and my SSDs have never failed. I feel the increased risk of RAID 0 with SSDs is negligible.

On my NASs I use spinners (HDDs) configured as RAID 5 (or the NAS vendor's equivalent) for everything and just have the entire NAS as a single volume... to keep this real simple. RAID 5 will tolerate a single disk failure with not data loss. The cost to this is a hit on performance and available disk space as some is used for redundancy smeared across the four drives. I have experienced hard drive failure in my NASs a few times now... I have been using them for many many years now. Spinners will fail. My NASs allow for hot swaps so away I went. The time it takes to resynce the new drive is long on my older NASs and will take many days... during which the files are available but at reduced performance. Even with my drive failures, I never lost data. Using a NAS in RAID 5 as storage for transactional data such a photo file there for editing is kind of dumb as it is slow... going through a network and then the slower drive system.

My transactional files are always inside my PC using the fastest drives in the fastest ports.

Maybe what is confusing is my drives inside my PC that I use for transactional purposes. My C drive is the operating system and applications like Light Room. My photos library, LR catalog, and the transactional photos (the ones I am editing) are on the D drive. My C and D drives are stupid fast NVME M.2 Gen5 drives, the C is 2TB, and D is 4TB. My E drive is the RAID 0 array. I recently built this screaming machine.

Peace
Bruce in Philly



Sep 09, 2024 at 04:03 PM





  Previous versions of Bruce n Philly's message #16637701 « Which HDD's for backup. »

 




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