Date: Thu, 2 Oct 2003 11:38:01 +0200 From: "Putinas" <pilkis@gmx.net> To: <freebsd-hardware@FreeBSD.ORG> Subject: fasttrack 100 raid0 and low write speed Message-ID: <051501c388c8$dfe0bc30$1e64a8c0@spotripoli.local>
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Hi all,
I have in my 4-STABLE system 2 drives in RAID 0 configuration:
ATA channel 2:
Master: ad4 <WDC WD600AB-22CBA1/04.07B04> ATA/ATAPI rev 5
Slave: no device present
ATA channel 3:
Master: ad6 <WDC WD600AB-22CBA1/04.07B04> ATA/ATAPI rev 5
Slave: no device present
and following controller
atapci0: <Promise ATA100 controller> port
0x9800-0x983f,0xa000-0xa003,0xa400-0xa407,0xa800-0xa803,0xb000-0xb007 mem
0xf0800000-0xf081ffff irq 9 at device 11.0 on pci2
( only this controller is sitting on irq 9 )
and I have noticed very low write speed with samba , transfer speeds are
lower then 1 mb/s, here is output from iostat
tty ad2 ad4 ad6 cpu
tin tout KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s us ni sy in id
0 9813 0.00 0 0.00 0.00 0 0.00 0.00 0 0.00 16 0 5 3 76
0 77 0.00 0 0.00 128.00 7 0.87 128.00 7 0.87 0 0 2 9
88
0 78 128.00 1 0.12 128.00 7 0.87 128.00 7 0.87 1 0 4 9
87
0 80 0.00 0 0.00 128.00 7 0.87 128.00 8 1.00 0 0 5 14
81
0 79 0.00 0 0.00 128.00 6 0.75 128.00 6 0.75 0 0 2 3
95
0 78 0.00 0 0.00 87.00 27 2.29 75.69 26 1.92 2 0 8 22 68
when read speed goes more then 8mb/s transfer via wire already, after
playing with samba settings I found out what writing to ad2 drive which is
not RAID0 part goes up to 7-8Mb/s without problem. So all my guessing about
wrong samba or network tuning was wrong and I come to the point:
why writes to array are so slow ? Is it "normal" or there is a way to fix
this somehow ?
Please reply me directly to e-mail ( if there will be any ;-)
Thank you,
Putinas
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