I bought 6x HUS726060AL5215 (6TB SAS3) and ran
The sixth had the following:
You'll notice the running time is 160% as long, dropping the overall average read/write from about 175MB/sec down to about 110MB/sec. The culprit seems to be corrected errors. Fast disks:
Slow disk:
Despite having about the same PoH, the slow disk has read and written far less data, and has 1000x as many corrected errors.
So, dead disk walking?
badblocks
on them. Five of them had runs that looked very similar to this:
Code:
# time badblocks -svw -b 4096 -c 131072 /dev/da1
Checking for bad blocks in read-write mode
From block 0 to 1465130645
Pass completed, 0 bad blocks found. (0/0/0 errors)
real 4545m36.927s
user 60m19.007s
sys 20m51.058s
Code:
# time badblocks -svw -b 4096 -c 131072 /dev/da0
Checking for bad blocks in read-write mode
From block 0 to 1465130645
Pass completed, 0 bad blocks found. (0/0/0 errors)
real 7307m25.928s
user 54m20.283s
sys 20m34.253s
Code:
Accumulated power on time, hours:minutes 32734:58
Accumulated start-stop cycles: 30
Accumulated load-unload cycles: 1220
Elements in grown defect list: 0
Vendor (Seagate Cache) information
Blocks sent to initiator = 53830322436964352
Error counter log:
Errors Corrected by Total Correction Gigabytes Total
ECC rereads/ errors algorithm processed uncorrected
fast | delayed rewrites corrected invocations [10^9 bytes] errors
read: 0 853 0 853 22857415 2228793.886 0
write: 0 90 0 90 3996424 580876.925 0
verify: 0 0 0 0 365101 2.214 0
Code:
Accumulated power on time, hours:minutes 32905:16
Accumulated start-stop cycles: 34
Accumulated load-unload cycles: 1423
Elements in grown defect list: 83
Vendor (Seagate Cache) information
Blocks sent to initiator = 8059375755198464
Error counter log:
Errors Corrected by Total Correction Gigabytes Total
ECC rereads/ errors algorithm processed uncorrected
fast | delayed rewrites corrected invocations [10^9 bytes] errors
read: 0 866516 0 866516 17891861 1342161.269 0
write: 0 69 0 69 5686799 84367.620 0
verify: 0 0 0 0 717638 1.713 0
So, dead disk walking?