Hard disk bottle neck.

Wojciech Puchar wojtek at wojtek.tensor.gdynia.pl
Sun Sep 28 11:30:06 UTC 2008

> Server Info:
> FreeBSD 6.2
> Apache 2.2.9
> DELL PowerEdge 1850
> 2GB RAM (only 184MB is active)

so what's up with other 1.8GB?

> 6x300MB SCSI 10K RPM RAID5

300MB disks at 10K? there was such?

> Gigabit Ethernet Connection
> My server can output NO MORE than 60Mbps (read only).

you mean Mbps or MBps

> The bottle neck is the hard disk. If I use ONE connection to download file
> from my server, the speed can go up to about 400Mbps.
> If I let visitors download using multiple connections, the server cannot
> output more than 60Mbps.
> My service is similar to rapidshare/megaupload, I am wondering how they
> configure their servers?
patch /usr/src/sys/sys/param.h

#ifndef DFLTPHYS
#define DFLTPHYS        (1024 * 1024)   /* default max raw I/O transfer size */
#ifndef MAXPHYS
#define MAXPHYS         (1024 * 1024)   /* max raw I/O transfer size */

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