curious to know...

 

I'm setting up a new system - just pre-cleared (via plugin) my 10TB drive, then installed 2x 6TB drives previously used from the shelf
I configured the 10TB as parity, and the 2x 6TB drives as data, then started parity sync.
I'm wondering why, from the ongoing stats, that reads and writes only appear to involve 2 out of the 3 drives?? (see attached).

 

Its reading the data disks to get the result of the parity calculation and write it to the parity disk. This is exactly what you should always see on any rebuild, whether data or parity. Lots of reads from all other disks, lots of writes to the rebuilding disk, all zeros in the Errors column.

On 2nd thought, it isn't showing lots of reads for data disk1.

 

Attach diagnostics to your NEXT post in this thread.

tower2-diagnostics-20220113-0715.zip

 

as requested, thanks

Edited January 13, 20224 yr by magic144

vmstat -d appears to show plenty going on for both sdc and sdd (data drive reads) and sdb (parity drive writes)
 

root@Tower2:~# vmstat -d
disk- ------------reads------------ ------------writes----------- -----IO------
       total merged sectors      ms  total merged sectors      ms    cur    sec
loop0    127      0    7578     515      0      0       0       0      0      0
loop1     42      0     690     168      0      0       0       0      0      0
loop2      0      0       0       0      0      0       0       0      0      0
loop3      0      0       0       0      0      0       0       0      0      0
loop4      0      0       0       0      0      0       0       0      0      0
loop5      0      0       0       0      0      0       0       0      0      0
loop6      0      0       0       0      0      0       0       0      0      0
loop7      0      0       0       0      0      0       0       0      0      0
sda      984  13946   98646    4437     89      1    1811     313      0      2
sdc   20697540 1288320655 10472145394 562282684      4      0       4      93      0  34932
sdd   20697457 1288320441 10472152197 148281605      4      0       4     108      0  28604
sdb      676      0   24398    1260 20685562 1288330609 10472129324 15762343      0  27455
md1       62      0    2194       0      0      0       0       0      0      0
md2       62      0    2194       0      0      0       0       0      0      0

so I'm wondering if it's just a GUI/display/presentation issue

It's a GUI issue, if you alternate to speed mode does it show correctly?

Yeah speed mode looks appropriate:

 

it's just the read/write totals/count display that's inconsistent (dare I say wrong?)

thanks

Could be a device or GUI issue, but those values are known to be inaccurate anyway, even when using identical devices, I would just ignore, keep in speed mode, much more useful.

ok then, will ignore (no other signs of disk/device errors/issues - and the vmstat and /proc/diskstats info seems appropriate for BOTH data drives, despite the GUI)

 

thanks to all for the feedback

Edited January 13, 20224 yr by magic144