Date: Sun, 28 Sep 2008 09:21:38 -0500 From: "Diego F. Arias R." <dak.col@gmail.com> To: "Bill Moran" <wmoran@potentialtech.com> Cc: freebsd-questions@freebsd.org, Danny Do <danhdo@gmail.com> Subject: Re: Hard disk bottle neck. Message-ID: <3b93bd110809280721g7c4a27afkc39649996c1a3cf8@mail.gmail.com> In-Reply-To: <20080928095436.3c9783c2.wmoran@potentialtech.com> References: <00d101c92154$691f53c0$3b5dfb40$@com> <20080928095436.3c9783c2.wmoran@potentialtech.com>
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First be shure your bottleneck are the hard drives. On Sun, Sep 28, 2008 at 8:54 AM, Bill Moran <wmoran@potentialtech.com> wrote: > "Danny Do" <danhdo@gmail.com> wrote: >> >> Hi guys, >> >> I have this problem for years but couldn't find a way to solve it. >> >> I have a file server handling large files from 1MByte to 1GByte. >> >> Server Info: >> FreeBSD 6.2 >> Apache 2.2.9 >> >> DELL PowerEdge 1850 >> 2GB RAM (only 184MB is active) >> 6x300MB SCSI 10K RPM RAID5 >> Gigabit Ethernet Connection >> >> My server can output NO MORE than 60Mbps (read only). >> >> The bottle neck is the hard disk. > > What evidence do you have that the bottleneck is disk IO? I've seen no > evidence, only speculation. > > In addition to the advice of others, you may be able to just beef up the > RAM. 2G isn't much these days. If you've got 200M active, you've got > about 1.8G available to cache files. If you have repeated access of the > same file, the OS can cache that file data and not even use the disk, but > it can only do that if it has enough RAM to work with. You need to get > your facts straight, though. According to the specs you've got above, > you've only got 1.5G of disk. I expect you meant 300G disks. > > You could also add disks in a RAID 10, which is generally faster than > RAID 5, or move to 15,000 RPM disks. I think you might be surprised how > much adding some RAM will help, though, unless your access patterns are > very random, RAM should speed up the access of popular data significantly. > > -- > Bill Moran > http://www.potentialtech.com > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" > -- mmm, interesante.....
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