[mythtv-users] Horrendous RAID-6 performance

[Yan Seiner]

John Drescher

> can you post the output of cat /proc/mdstat

OK, see below.  All of the system stuff sits on two SCSI drives.  The
array with bad performance consists of 6-400 GB SATA drives.  They only
have a single 1.2 TB partition.

selene:/var/log# cat /proc/mdstat
Personalities : [raid0] [raid1] [raid6] [raid5] [raid4]
md10 : active raid6 sdd1[0] sdi1[5] sdh1[4] sdg1[3] sdf1[2] sde1[1]
      1562834944 blocks level 6, 64k chunk, algorithm 2 [6/6] [UUUUUU]

selene:/var/log# uname -a
Linux selene 2.6.24 #1 SMP Fri Jan 25 14:59:10 PST 2008 x86_64 GNU/Linux

lspci:
00:00.0 RAM memory: nVidia Corporation MCP55 Memory Controller (rev a1)
00:01.0 ISA bridge: nVidia Corporation MCP55 LPC Bridge (rev a2)
00:01.1 SMBus: nVidia Corporation MCP55 SMBus (rev a2)
00:01.2 RAM memory: nVidia Corporation MCP55 Memory Controller (rev a2)
00:02.0 USB Controller: nVidia Corporation MCP55 USB Controller (rev a1)
00:02.1 USB Controller: nVidia Corporation MCP55 USB Controller (rev a2)
00:04.0 IDE interface: nVidia Corporation MCP55 IDE (rev a1)
00:05.0 IDE interface: nVidia Corporation MCP55 SATA Controller (rev a2)
00:05.1 IDE interface: nVidia Corporation MCP55 SATA Controller (rev a2)
00:05.2 IDE interface: nVidia Corporation MCP55 SATA Controller (rev a2)
00:06.0 PCI bridge: nVidia Corporation MCP55 PCI bridge (rev a2)
00:06.1 Audio device: nVidia Corporation MCP55 High Definition Audio (rev a2)
00:08.0 Bridge: nVidia Corporation MCP55 Ethernet (rev a2)
00:09.0 Bridge: nVidia Corporation MCP55 Ethernet (rev a2)
00:0d.0 PCI bridge: nVidia Corporation MCP55 PCI Express bridge (rev a2)
00:0e.0 PCI bridge: nVidia Corporation MCP55 PCI Express bridge (rev a2)
00:0f.0 PCI bridge: nVidia Corporation MCP55 PCI Express bridge (rev a2)
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
Miscellaneous Control
01:06.0 VGA compatible controller: nVidia Corporation NV34GL [Quadro NVS
280 PCI] (rev a1)
01:07.0 Multimedia video controller: Brooktree Corporation Bt878 Video
Capture (rev 11)
01:07.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture
(rev 11)
01:08.0 Multimedia video controller: Conexant CX23880/1/2/3 PCI Video and
Audio Decoder (rev 05)
01:08.1 Multimedia controller: Conexant CX23880/1/2/3 PCI Video and Audio
Decoder [Audio Port] (rev 05)
01:08.2 Multimedia controller: Conexant CX23880/1/2/3 PCI Video and Audio
Decoder [MPEG Port] (rev 05)
01:0b.0 FireWire (IEEE 1394): Texas Instruments TSB43AB22/A
IEEE-1394a-2000 Controller (PHY/Link)
02:00.0 PCI bridge: PLX Technology, Inc. PEX 8114 PCI Express-to-PCI/PCI-X
Bridge (rev bc)
03:04.0 SCSI storage controller: Adaptec ASC-29320ALP U320 (rev 10)
05:00.0 VGA compatible controller: nVidia Corporation G70 [GeForce 7600
GT] (rev a1)



-- 
Windows is like a canary in a coal mine, it's the first thing to die on
your network.