You ignored the possibility of the 4K partition misalignment so I don't consider it solved
Code:
# diskinfo -v ada0
ada0
512 # sectorsize
400088457216 # mediasize in bytes (372G)
781422768 # mediasize in sectors
0 # stripesize
0 # stripeoffset
775221 # Cylinders according to firmware.
16 # Heads according to firmware.
63 # Sectors according to firmware.
S0NFJDWQ304886 # Disk ident.
If your 'slow' disk reports a sector size of 4096 and if that partition
p is not aligned on a 4K boundary it will have a negative impact on disk performance.
From
https://en.wikipedia.org/wiki/Advanced_Format :
Quote:
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The translation process is more complicated when writing data that is either not a multiple of 4K or not aligned to a 4K boundary. In these instances, the hard drive must read the entire 4,096-byte sector containing the targeted data into internal memory, integrate the new data into the previously existing data and then rewrite the entire 4,096-byte sector onto the disk media. This operation, known as read-modify-write (RMW), can require additional revolution of the magnetic disks, resulting in a perceptible performance impact to the system user. Performance analysis conducted by IDEMA and the hard drive vendors indicates that approximately five to ten percent of all write operations in a typical business PC user environment may be misaligned and a RMW performance penalty incurred.
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That is why I asked for the output of
diskinfo(8) and
gpart(8)
Although not needed for this particular disk because it does not have 4K disk sectors, I aligned the first partition on a 63 x 8 = 504 sectors boundary.
Code:
# gpart show
=> 63 625142385 ada0 MBR (298G)
63 441 - free - (220k)
504 20971440 1 freebsd (10G)
20971944 83885760 2 !166 (40G)
104857704 520284744 3 freebsd [active] (248G)
So please check the disk sector size and partition alignment