Slow parity-data rebuild

[hermsnross]

Currently have added a disk controller to may array server, with capacity of 8tb 4 slots, added 3 disk @  6tb, 1tb and 6tb...as each additional disk was added I keep getting a rebuild on disk 5 after preclear is finished on newly installed disk, the rebuild is averaging 2.8mb/s need to know if this is normal or if there is a fix. Also during the rebuild unable to play movies on the Plex server. Currently disk 5 is being rebuilt with error, disk 6 okay running fine no error, disk 7 running good but with errors. When I originally installed disk 5 I had to do a rebuild, but it took only 17hour @ about 98mb/s.

[trurl]

Go to Tools-diagnostics and attach the complete Diagnostics zip file to your NEXT post 

[hermsnross]

tower-diagnostics-20200220-2140.zip

[itimpi]

You are getting continual resets on the disk being rebuilt and also less frequently on disk7 which explains the slow speed.      I would carefully check the cabling to these two drives as the most likely cause.

[hermsnross]

Its a single cable to a single sata interface, with currently no problem with disk 6....

[JorgeB]

The 6 or 10 ports controller you're using is in fact a 2 port controller with SATA port multipliers, they are a known problem, you'll need to replace it to get rid of those timeout errors.

[hermsnross]

what do you recommend replacing the controller, or SATA port multiplier, and can you recommend a better replacement???

[JorgeB]

The controller includes the SATA multiplier, replace it with any LSI with a SAS2008/2308/3008/3408 chipset in IT mode, e.g., 9201-8i, 9211-8i, 9207-8i, 9300-8i, 9400-8i, etc and clones, like the Dell H200/H310 and IBM M1015, these latter ones need to be crossflashed.

[hermsnross]

can you forward me the link  to the replacement device

[JorgeB]

Look for one on ebay, this one is considered a reputable seller.

[hermsnross]

Thanks for the recommendation, but I'm looking for a controller card/cable that would support a eSata external enclosure sy-enc50104, please advise. 

[JorgeB]

There's no recommended controller to use an eSATA enclosure with port multiplier.

[hermsnross]

why am I stuck on verifying DMI pool..and can't get to BIOS....plex server in loop

[sdamaged]

eSata external enclosure is not really supported and will give you problems like you're getting

 

As johnnie mentioned, you need a proper SAS controller

 

If you don't want issues or problems, use recommended / supported hardware

[hermsnross]

okay thanks but this a different concern...why am I stuck on verifying DMI pool..and can't get to BIOS....plex server in loop

[JorgeB]

2 hours ago, hermsnross said:

why am I stuck on verifying DMI pool.

That likely a bios/hardware issue, clear CMOS and disconnect/remove anything attached to the board, if it boots like that then start reconnecting stuff.