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Hi all,


Apologies if posting under wrong thread, admin please feel free to move.


I noticed after my recent installation of DSM 6.2.1 the performance is very poor compared to my previous 5.2 setup.

Not sure if it's HDD read/write related by over it seems extremely slow starting from login and browsing, ending with file transfer and usage of DSM File app.


Some outputs here for my hdd performance:


root@sin-nas01:/dev# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [raidF1]
md3 : active raid1 sdc3[3] sdd3[2]
      1948692416 blocks super 1.2 [2/2] [UU]

md2 : active raid1 sdb3[0]
      204893184 blocks super 1.2 [1/1] [U]

md1 : active raid1 sdb2[0] sdc2[1] sdd2[2]
      2097088 blocks [12/3] [UUU_________]

md0 : active raid1 sdb1[0] sdc1[1] sdd1[2]
      2490176 blocks [12/3] [UUU_________]



root@sin-nas01:/dev# hdparm -t /dev/sdd3

 Timing buffered disk reads: 444 MB in  3.00 seconds = 147.98 MB/sec  (<-- which is looking good)

root@sin-nas01:/dev# hdparm -t /dev/sdc3

 Timing buffered disk reads: 

^C  (<-- it just stops there and have to Ctrl+C to terminate)


I'm a noob when it comes to DSM and linux in general. Are there any well-known issues that I failed to read about and is there a way to improve performance?


Any advise would be much appreciated.



Edited by byallmeans
highlighted some of the key comments
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