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Adding a hdd of a different spec
#1
I have a 918+ with 2x 8TB IronWolfs (IronWolves?!) now i have an extra WD Black 4TB (WD4003FZEX) spare so i was going to put that in also.

2 questions

1, Does it make any difference having different spec drives in? - my gut feeling is they're all 7200 so probably not really.

Looking at this comparison on userbenchmark i can't really see the wood from the trees.  Big difference in 4K Read is worrying, though i'm not sure i trust those figures.

2, How can i measure performance before & after?

Thanks

Paul
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#2
Are you adding it into one array or will it be there as a separate drive?
Alan
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#3
(17-03-2019, 06:53 PM)alansh Wrote: Are you adding it into one array or will it be there as a separate drive?

All into the same array - so will go to 1 x 12TB useable.
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#4
You won't added it into the same one. Can't add smaller drives then 8TB. Equal or greater then 8 is your option atm. Guessing those 2x8 are in SHR?
Synology DS918+ (4x4TB WD RED - RAID 5 with 2x250GB 970EVO NVMe) | Synology DS412+ (4x3TB WD RED - RAID 5) | RT1900AC
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#5
(18-03-2019, 08:38 AM)Rusty Wrote: You won't added it into the same one. Can't add smaller drives then 8TB. Equal or greater then 8 is your option atm. Guessing those 2x8 are in SHR?

Yes they are in SHR - though according to the Synology Raid calculator i can do this - can't quite get my head around how it does it though!
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#6
Raid calc is for fresh array only, not when you add drives on an existing volume.
Synology DS918+ (4x4TB WD RED - RAID 5 with 2x250GB 970EVO NVMe) | Synology DS412+ (4x3TB WD RED - RAID 5) | RT1900AC
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#7
You can create new (2nd) SHR with the 4TB. Of course, with one drive, there is no RAID redundancy.
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