Disk in parity slot is not biggest


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I have two Samsung 860Evo 2TB, and when I tried to use one as data and the other one as parity, Unraid told me "Disk in parity slot is not biggest" and array is not permitted to start.

I know the topic about "HPA mode", but I'm not using Gigabyte motherboard, my machine is HPE Microserver 10+ and the command hdparm indicates that HPA is disabled for both disks.

Any clues for what's going on?

Thanks !

tower-diagnostics-20210731-1847.zip

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Not sure why they are reported as different sizes, but in the syslog I see

 

Jul 31 18:46:46 Tower kernel: mdcmd (1): import 0 sdc 2048 1953513560 0 Samsung_SSD_860_EVO_2TB_S597NJ0NB20380F

Jul 31 18:46:46 Tower kernel: md: import disk0: (sdc) Samsung_SSD_860_EVO_2TB_S597NJ0NB20380F size: 1953513560

Jul 31 18:46:46 Tower kernel: md: disk0 new disk

Jul 31 18:46:46 Tower kernel: mdcmd (2): import 1 sdb 64 1953514552 0 Samsung_SSD_860_EVO_2TB_S597NJ0NB18397B

Jul 31 18:46:46 Tower kernel: md: import disk1: (sdb) Samsung_SSD_860_EVO_2TB_S597NJ0NB18397B size: 1953514552

Jul 31 18:46:46 Tower kernel: md: disk1 new disk

 

which suggests they are not exact;y the same size.    You could try swapping them over and see if UnRaid then lets you start the array.

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12 minutes ago, itimpi said:

Not sure why they are reported as different sizes, but in the syslog I see

 

Jul 31 18:46:46 Tower kernel: mdcmd (1): import 0 sdc 2048 1953513560 0 Samsung_SSD_860_EVO_2TB_S597NJ0NB20380F

Jul 31 18:46:46 Tower kernel: md: import disk0: (sdc) Samsung_SSD_860_EVO_2TB_S597NJ0NB20380F size: 1953513560

Jul 31 18:46:46 Tower kernel: md: disk0 new disk

Jul 31 18:46:46 Tower kernel: mdcmd (2): import 1 sdb 64 1953514552 0 Samsung_SSD_860_EVO_2TB_S597NJ0NB18397B

Jul 31 18:46:46 Tower kernel: md: import disk1: (sdb) Samsung_SSD_860_EVO_2TB_S597NJ0NB18397B size: 1953514552

Jul 31 18:46:46 Tower kernel: md: disk1 new disk


 

which suggests they are not exact;y the same size.    You could try swapping them over and see if UnRaid then lets you start the array.

tried to swap them and i was able to start the array.

but i really don't want to move all the data...

the weird thing is that the command `hdparm` shows the same size

i'd better cancel the order for another two 860 evo, since the tiny difference.

thank you for the reply!

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On 8/1/2021 at 6:10 AM, JorgeB said:

SSDs have the same size, but the first one was was likely formatted before v6.9.x, the new alignment now makes them have a smaller partition.

Thanks!

So the only way is to transfer the data and reformat it?

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