Re: New RAID array syncs very slow

Jay Roberts <roberts@oddpost.com> · Wed, 24 Mar 2004 07:20:06 -0500

This turned out to be really helpful. While investigating why one of  
the drives had so much lower numbers than the others using the test you 
suggested, I discovered a bent down pin in the cable socket. After 
fixing , the stats popped back up to the other drives' levels, and the 
estimated sync time on the 1.3 Duron box dropped to around 4 hours. I 
moved all the hardware back to the original P3-450 box, made sure DMA 
was enabled, and the sync time was now only 8 hours vs 91. A huge 
improvement and a livable time period. I was surprised at the difference 
in sync time between the two boxes.  Almost double on the P3-450 over 
the 1.3 Duron. 

Gordon Henderson wrote:

On Tue, 23 Mar 2004, Jay Roberts wrote:

I just set up a new Raid5 array using 4 200GB disks on 2 controllers. I
created the array, and it begins to sync up, but it will not sync at
over 600Kb. It has been over 12 hours now, and the sync is only 7% done.
From reading, I know that sync should only take a few hours, but at the
current rate mine will take 91 hours which seems like an insane amount

of time. I am looking for any advice on this.  Details follow:

You probably don't have DMA enabled on the controller. See what

 hdparm /dev/hde

and for all the other drives you have gives.

Do a crude speed test with

 hdparm -Tt /dev/hde

too. You ought to get at least 45MB/sec on a modern IDE drive.

You might have to build a custom kernel to get the right driver for the
chipset.

Gordon

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