Hi,
(this thread replaces a reply to an earlier thread that was old and not very relevant)
I'm have serious performance problems with NAS drives on my iMac (OSX 10.6.8 3.06GHz IC2D 4GB) and Mac Pro (10.6.8 2.8GHz IC2D 16GB). I recently replaced a WD iBook World NAS that was extremely slow with a new Seagate Blackarmor NAS 220 4TB Raid5. I thought the WD drive was failing because it was so slow. The new drive is no faster than the WD drive.
I can write to the drives at speeds I would expect (>50Mb/sec). Faster if connected
via a gigabit path. Reading from either drive is exceedingly slow. It takes me several HOURS to copy a 150MB file from either the WD or Seagate NAS to either Mac. I can copy the same file in several minutes to my windows PC over the exact same network connected to the exact same switch and router.
I believe there is some kind of a problem in the OSX tcpip software. I've found some information describing tcpip issues in OSX relating to tuning the delayed_ack setting in the tcpip configuration... for instance here:
iMac & Drobo FS NAS slow connection.. | Q8i.Org
I have tried these with no significant improvement.
Anybody have any clue what is going on? ALL my PC's have no problem getting reasonable transfer rates from these drives..
Please don't reply with posts describing how NAS drives are inherently slow and I should be using a..... This configuration would suit my needs if it worked as it should.
AND! Thanks in advance for any help,
Steve
(this thread replaces a reply to an earlier thread that was old and not very relevant)
I'm have serious performance problems with NAS drives on my iMac (OSX 10.6.8 3.06GHz IC2D 4GB) and Mac Pro (10.6.8 2.8GHz IC2D 16GB). I recently replaced a WD iBook World NAS that was extremely slow with a new Seagate Blackarmor NAS 220 4TB Raid5. I thought the WD drive was failing because it was so slow. The new drive is no faster than the WD drive.
I can write to the drives at speeds I would expect (>50Mb/sec). Faster if connected
via a gigabit path. Reading from either drive is exceedingly slow. It takes me several HOURS to copy a 150MB file from either the WD or Seagate NAS to either Mac. I can copy the same file in several minutes to my windows PC over the exact same network connected to the exact same switch and router.
I believe there is some kind of a problem in the OSX tcpip software. I've found some information describing tcpip issues in OSX relating to tuning the delayed_ack setting in the tcpip configuration... for instance here:
iMac & Drobo FS NAS slow connection.. | Q8i.Org
I have tried these with no significant improvement.
Anybody have any clue what is going on? ALL my PC's have no problem getting reasonable transfer rates from these drives..
Please don't reply with posts describing how NAS drives are inherently slow and I should be using a..... This configuration would suit my needs if it worked as it should.
AND! Thanks in advance for any help,
Steve