Disk very slow in FreeBSD
rloefgren at forethought.net
Sat Jul 10 16:38:02 UTC 2010
On 07/09/10 20:26, Depo Catcher wrote:
> I've tried everything here:
> and here: http://forums.freebsd.org/showthread.php?t=15722
> Also followed this:
> I have a 2TB WD drives that I would like to use as one big data
> I'm using UFS2. No raid, nothing fancy. I'm on FreeBSD 6.4 Release.
> Under windows I can easily read/write about at ~75MB/s without doing
> nothing but formatting it.
> My friend has the same drives in Linux, he says he can get ~50MB/s on
> his very low end system (crap cpu and only 256mb of ram).
> Under FreeBSD, my write is at best ~6MB/s and read is about ~9MB/s.
> The CPU, amount of ram, etc are all better than both the above boxes
> so don't think it's bound by anything externally like that. From what
> I read, the partitions aren't aligned correctly?
> What's going on here? For start to finish, how should I partition and
> format these so they don't suck?
> [root at fire2 ~/drive]# diskinfo -v /dev/da3
> 512 # sectorsize
> 2000396746752 # mediasize in bytes (1.8T)
> 3907024896 # mediasize in sectors
> 243201 # Cylinders according to firmware.
> 255 # Heads according to firmware.
> 63 # Sectors according to firmware.
> 8 partitions:
> # size offset fstype [fsize bsize bps/cpg]
> a: 3906961408 1 4.2BSD 4096 32768
> bsdlabel -R /dev/da3 datadrive.cfg
> newfs -S 4096 -b 32768 -f 4096 -O 2 -U -m 8 -o space -L u2 /dev/da3
> /dev/da3 /u3 ufs rw 2 2
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sysctl -a | grep vfs.read_max
and post the result. Or just set it to something bigger than (8?) and
see what speeds you get. On my box:
FreeBSD is set up pretty conservatively out of the box. The learning
curve is fun.
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