Messages in this thread | | | Date | Fri, 15 Feb 2008 11:36:25 -0600 | From | Roger Heflin <> | Subject | Re: Disk schedulers |
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Lukas Hejtmanek wrote: > On Fri, Feb 15, 2008 at 03:42:58PM +0100, Jan Engelhardt wrote: >> Also consider >> - DMA (e.g. only UDMA2 selected) >> - aging disk > > it's not the case. > > hdparm reports udma5 is used, if it is reliable with libata. > > The disk is 3 months old, kernel does not report any errors. And it has never > been different. >
A new current ide/sata disk should do around 60mb/second, check the min/max bps rate listed on the disk companies site, and divide by 8, and take maybe 80% of that
Also you may consider using the -l option on the scp command to limit its total usage.
This feature has been around at least 8 years (from 2.2) that high levels of writes would significantly starve out reads, mainly because you can queue up 1000's of writes, and a read, when the read finishes there are another 1000's writes for the next read to get in line behind, and wait, and this continues until the writes stop.
Roger
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