magic144 Posted January 13, 2022 Share Posted January 13, 2022 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). Quote Link to comment
trurl Posted January 13, 2022 Share Posted January 13, 2022 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. Quote Link to comment
trurl Posted January 13, 2022 Share Posted January 13, 2022 On 2nd thought, it isn't showing lots of reads for data disk1. Attach diagnostics to your NEXT post in this thread. Quote Link to comment
magic144 Posted January 13, 2022 Author Share Posted January 13, 2022 (edited) tower2-diagnostics-20220113-0715.zip as requested, thanks Edited January 13, 2022 by magic144 Quote Link to comment
magic144 Posted January 13, 2022 Author Share Posted January 13, 2022 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 Quote Link to comment
JorgeB Posted January 13, 2022 Share Posted January 13, 2022 It's a GUI issue, if you alternate to speed mode does it show correctly? Quote Link to comment
magic144 Posted January 13, 2022 Author Share Posted January 13, 2022 Yeah speed mode looks appropriate: it's just the read/write totals/count display that's inconsistent (dare I say wrong?) thanks Quote Link to comment
JorgeB Posted January 13, 2022 Share Posted January 13, 2022 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. Quote Link to comment
magic144 Posted January 13, 2022 Author Share Posted January 13, 2022 (edited) 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, 2022 by magic144 Quote Link to comment
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