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SubjectDAC960 and cache...
Date

Hi,

I have a Mylex Acceleraid 170 Raid board and i use
DAC960 RAID Driver Version 2.4.11 of 11 October 2001
under linux (kernel 2.4.18).
Here is the cat /proc/rd/c0/current_status :

***** DAC960 RAID Driver Version 2.4.11 of 11 October 2001 *****
Copyright 1998-2001 by Leonard N. Zubkoff <lnz@dandelion.com>
Configuring Mylex AcceleRAID 170 PCI RAID Controller
Firmware Version: 6.00-15, Channels: 1, Memory Size: 32MB
PCI Bus: 0, Device: 6, Function: 0, I/O Address: Unassigned
PCI Address: 0xFC000000 mapped at 0xE0800000, IRQ Channel: 16
Controller Queue Depth: 512, Maximum Blocks per Command: 2048
Driver Queue Depth: 511, Scatter/Gather Limit: 128 of 257 Segments
Physical Devices:
0:0 Vendor: QUANTUM Model: ATLAS10K3_36_SCA Revision: 020W
Wide Synchronous at 160 MB/sec
Serial Number: 344208142992
Disk Status: Online, 71798784 blocks
0:1 Vendor: QUANTUM Model: ATLAS10K3_36_SCA Revision: 020W
Wide Synchronous at 160 MB/sec
Serial Number: 344207749285
Disk Status: Online, 71798784 blocks
0:2 Vendor: QUANTUM Model: ATLAS10K3_36_SCA Revision: 020W
Wide Synchronous at 160 MB/sec
Serial Number: 344211046648
Disk Status: Online, 71798784 blocks
0:3 Vendor: QUANTUM Model: ATLAS10K3_36_SCA Revision: 020W
Wide Synchronous at 160 MB/sec
Serial Number: 344211046660
Disk Status: Online, 71798784 blocks
0:4 Vendor: QUANTUM Model: ATLAS10K2-TY184J Revision: DDD6
Wide Synchronous at 160 MB/sec
Serial Number: 161034310612
Disk Status: Online, 35827712 blocks
0:5 Vendor: QUANTUM Model: ATLAS10K2-TY184J Revision: DDD6
Wide Synchronous at 160 MB/sec
Serial Number: 161034412602
Disk Status: Online, 35827712 blocks
0:7 Vendor: MYLEX Model: AcceleRAID 170 Revision: 0600
Wide Synchronous at 160 MB/sec
Serial Number:
Logical Drives:
/dev/rd/c0d0: RAID-6, Online, 107483136 blocks
Logical Device Initialized, BIOS Geometry: 255/63
Stripe Size: 64KB, Segment Size: 8KB
Read Cache Disabled, Write Cache Disabled
No Rebuild or Consistency Check in Progress

as you see, both read and write cache are disabled. I don't manage to enable
them... would you give me any clue ?

I also think my filesystem is slow : i used
mke2fs -b 4096 -R stride=16 -i 16384 /dev/rd/c0d0p4
but i only get arround 5 Mo/s while doing a tar c KDE | dd of=/dev/null
(KDE is a 715 Mo source/compilation tree of KDE)
Do you have any clue on how to improve this performance (direct sequencial
access on this disk using dd give me around 50 Mo/s)

Thx in advance for you help.

N. Turro
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