Messages in this thread | | | From | Chris Boot <> | Subject | Re: RAID Sync Speeds | Date | Mon, 22 May 2006 18:02:34 +0100 |
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On 22 May 2006, at 14:05, Rainer Shiz wrote:
> Hi, > I have a general question on operating software RAIDs in linux. > I am running md RAID in linux 2.6.12 kernel. I observed that the > sync speeds > were always much closer to /proc/sys/dev/raid/speed_limit_min value, > than > /proc/sys/dev/raid/speed_limit_max value. I agree that disk activity > (I/O) and > other system usage will bring down sync speeds. But I want sync speeds > to be > higher at whatever cost. So I thought I will just set max value to > around > 500000 and leave the min at 5000. But with idle disk activity and > otherwise > idle system usage, I still see sync speeds around 5300Kb/s only. > > So Is the 2.6 kernel designed to sync at speeds closer to min than > max? > > Please advise.
I must admit I keep my settings on the default (1000/200000) and get whatever my disks can handle, usually 50-70MB/sec. All this is on a completely idle system, doing anything disk bound at all will lower these numbers significantly. This is on various SATA controllers, all with Seagate drives.
HTH, Chris
-- Chris Boot bootc@bootc.net http://www.bootc.net/
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