March 11, 201313 yr Hi All, I've set-up a HP N40L to act as an off-site backup to my Synology box, but am experiencing really poor write speeds during local testing - Using midnight commander I am only seeing 15MB/s on disk to disk transfers! Version 5.0-rc11 Disks are 3no. 3tb WD Reds (1no. parity & 2no. storage) and 2no. 1tb Samsung F2 (1no. storage & 1no. cache) which have all seen previous action and performed much better. BIOS is modified and adjusted as per the guides on the net. hdparm giving me read speeds of 150 MB/s. Parity sync and new writes only hit 25MB/s So, is this just a limitation of the hardware or should I be seeing faster writes? Its been awhile since I used unraid but I'm sure it was quicker than this! Many thanks, J 130311-214800_syslog.txt
March 11, 201313 yr I have an HP N40L with 3 x WD Red 3 TB drives (1 parity and 2 data) running 5.0-rc10. I am still running the standard HP bios that came with the box. I did bump the memory to 4 GB. With some download and file transfer activity ongoing my last parity check averaged 100 MB/sec. Watching the main screen during a parity check, with no other activity going on, shows about 140 MB/sec. Larger file copies over the network from a Windows box to the unRAID run at about 25 MB/sec using FastCopy with default parameters. I don't know what to expect here but am not unhappy with that number. Are you saying that new data writes over the network hit 25 MB/sec? That is about what I see, but parity checks with no other activity ongoing should be much faster. If you see disk read speeds of 150 MB/sec on a single disk that also indicates you should see better parity checks.
March 12, 201313 yr My build is below, and parity with the 2Tb drives was around 60MB/s+ which was faster than with 4.7 As 36bitter said, I'm getting the same 25MB/s over the network. Doesn't bother me because once the initial upload in done, it's just individual files and a lot of reading (which is much faster). The N40L is a great little box. I've got an extra drive in the ODD bay as an apps drive. Gets a little hot in there 40degC though. Personally I have never see the BIOS, I just put the USB key in and away it went.
March 13, 201313 yr Author Have you switched on Write Caching in the BIOS? Ah, I thought I had but it doesn't appear to have saved when I exited the bios Write speeds are now a steady 34MB/s Thanks for the replies folks! J
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