Disk very slow in FreeBSD
c.kworr at gmail.com
Sat Jul 10 11:18:31 UTC 2010
10.07.2010 05:26, 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 partition.
> I'm using UFS2. No raid, nothing fancy. I'm on FreeBSD 6.4 Release.
Have you tried last release version?
> 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
Can you post detail about your controller? Can you post cache and error
recovery mode pages for your disks? Dmesg sample?
# camcontrol devlist
<ATA WDC WD1002FBYS-0 0C06> at scbus0 target 0 lun 0 (da0,pass0)
<ATA WDC WD1002FBYS-0 0C06> at scbus0 target 1 lun 0 (da1,pass1)
<HITACHI HUS156030VLS600 A392> at scbus0 target 2 lun 0 (da2,pass2)
<HITACHI HUS156030VLS600 A392> at scbus0 target 3 lun 0 (da3,pass3)
<HITACHI HUS154545VLS300 A500> at scbus0 target 4 lun 0 (da4,pass4)
<HITACHI HUS154545VLS300 A500> at scbus0 target 5 lun 0 (da5,pass5)
Now take scbus:target:lun and issue:
# camcontrol modepage 0:0:0 -l
0x01 Read-Write Error Recovery Page
0x03 Format Device Page
0x04 Rigid Disk Drive Geometry Page
0x08 Caching Page
0x0a Control Mode Page
The caching page is number 8:
# camcontrol modepage 0:0:0 -m 8
Demand Retention Priority: 0
Write Retention Priority: 0
Disable Pre-fetch Transfer Length: 0
Minimum Pre-fetch: 0
Maximum Pre-fetch: 0
Maximum Pre-fetch Ceiling: 0
Sphinx of black quartz judge my vow.
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