What does the SMART info show for the drives - are there any reallocated
blocks? A large number of those scattered over the disk would certainly
cause seeking for both reads and writes.
I will check the SMART this evening but I don't think that this is causing
the seek. The sound is very constant and for the whole time of syncing
the array.
I will also run a dd on the disk to compare.
It's also worth checking whether there's anything else that would be
accessing the disks in the background (monitoring/indexing/etc).
Unlikely because I have not yet created a filesystem after setting up
the RAID4.
I can't think of anything else that would be causing reads to seek - SMR
disks or write-intent bitmaps would only affect writes.
Exactly
Is there any way or tool to monitor all disk read/write commands - not only
the count or amount but every access with LBA and length?
Patrick
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