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SHR vs JBOD, drive health

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366
68
NAS
DS923+ (16GB)
Router
  1. RT6600ax
Operating system
  1. Windows
Reading/writing files to a JBOD setup instead of SHR, wouldn't that cause less disk I/O than on a SHR setup cause a file actually has a "home drive" rather than all of them on a SHR-setup? Hope you get what I mean..
 
Plausible. I guess you weigh the risk of one hardware failure versus per device total read/write. Then which do you consider needs to be protected against more.
 
Very difficult to justify JBOD (combining multiple physical drives into one virtual drive). If you do the math on probabilities, a failure of either physical drive means the volume is lost.
 
Last edited:
Only when you have redundancy - And then have a drive failure - can you appreciate the upfront expense SHR entails……..

Wife - the person who I have to run past for all purchases Here…… understands this all too well, because she saw that firsthand at her work years ago, and the repercussions of that decision! We are complete believers in redundancy here. She hardly ever complains about fixing/upgrading anything related to redundancy!

Now that doesn’t mean we don’t use single drives….. It just means they are delegated to the 3rd location or so for redundant storage. We prefer multiple redundant storage, with nearly instant access, with the first 2 also being redundant (SHR, or Raid 1, if you will), as opposed to a backup, that can take time to recover from. Time is money.

We have been using Synology’s SHR For maybe 8+ years now, on 4 different systems. After the first, there was no consideration of anything else on the next 3!!!! Have not encountered anything for me to say otherwise. Synology SHR has been fine for us, even when a drive failure has occurred! You know I’m critical. I have no issues with SHR!
 
I/O Load (JBOD vs SHR): JBOD localizes I/O to a single disk, reducing overall load compared to SHR, which involves striping and parity across all disks, increasing disk activity.
Why?
Without a dedicated disk controller, Synology relies on the CPU for all disk operations.

Read/Write Operations: JBOD is less suitable for frequent read/write operations due to fragmentation and uneven disk wear. The choice between JBOD and RAID depends on the specific data usage patterns and frequency of access.

… then there is no universal answer valid for everyone.

If I were ever to use JBOD, it would be as a backup of last possible choice -strictly for incremental, sequential backups, with no furious overwrites. Otherwise, it could end up like Waterloo: a total disaster waiting to happen!
 
Otherwise, it could end up like Waterloo: a total disaster waiting to happen!
Depends which side you were on ... unless you were a lowly soldier and then it probably wasn't very good on either side.

… then there is no universal answer valid for everyone
Indeed. The scenario should always determine what the answer should be, or at least limit the possible answers.
 
If I were ever to use JBOD, it would be as a backup of last possible choice -strictly for incremental, sequential backups, with no furious overwrites.
Exactly, that's why I set up my backup NAS this way and my backups are incremental.
 

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