[PlanetCCRMA] tuning disks with /dev/sda SCSI drives

[Noah Garrett Wallach]

On Fri, 12 Nov 2004 09:25:09 -0800, Mark Knecht wrote
> start with hdparm -tT to get some speed info. Look at interrupts 
> also. cat /proc/interrupts and cat /proc/irq/...
> 

Mark,

Okay the CCRMA documentation appears to be IDE-focused.  I am not sure what to
do with this data?

--- snip ---

[root at dhcp-178-1-168-192 root]# hdparm -tT /dev/sda
 
/dev/sda:
 Timing buffer-cache reads:   3164 MB in  2.00 seconds = 1583.03 MB/sec
 Timing buffered disk reads:  166 MB in  3.00 seconds =  55.30 MB/sec
[root at dhcp-178-1-168-192 root]# hdparm -tT /dev/sda
 
/dev/sda:
 Timing buffer-cache reads:   3432 MB in  2.00 seconds = 1718.84 MB/sec
 Timing buffered disk reads:  168 MB in  3.03 seconds =  55.53 MB/sec

[root at dhcp-178-1-168-192 root]# cat /proc/interrupts
           CPU0       CPU1
  0:    1018635     980361    IO-APIC-edge  timer
  1:        525        625    IO-APIC-edge  i8042
  8:          1          0    IO-APIC-edge  rtc
  9:          0          0   IO-APIC-level  acpi
 14:       1243       1009    IO-APIC-edge  ide0
 15:      16536       2635    IO-APIC-edge  libata
169:      60338      58591   IO-APIC-level  uhci_hcd, uhci_hcd,
radeon at PCI:1:0:0177:          0          0   IO-APIC-level  uhci_hcd
185:          0          0   IO-APIC-level  Intel ICH5
193:      27080          0   IO-APIC-level  uhci_hcd, eth0
201:          2          0   IO-APIC-level  ehci_hcd
209:          0          0   IO-APIC-level  rme9652
NMI:          0          0
LOC:    1998918    1999095
ERR:          0
MIS:          0
[root at dhcp-178-1-168-192 root]# cat /proc/irq
cat: /proc/irq: Is a directory
[root at dhcp-178-1-168-192 root]# ls /proc/irq
0  10  12  14  169  185  2    209  4  6  8  prof_cpu_mask
1  11  13  15  177  193  201  3    5  7  9
[root at dhcp-178-1-168-192 root]#


--- snip ---

cheers,

Noah


> - Mark
> 
> On Fri, 12 Nov 2004 07:44:04 -0800, Noah Garrett Wallach
> <logic at enabled.com> wrote:
> > 
> > 
> > there isnt a lot of detail for the drive in my box.  can somebody provide some
> > clues about tuning this drive?
> > 
> > --- snip ---
> > 
> > [root at dhcp-178-1-168-192 apt]# /sbin/hdparm /dev/sda
> > 
> > /dev/sda:
> >  readonly     =  0 (off)
> >  geometry     = 19457/255/63, sectors = 312581808, start = 0
> > 
> > --- snip ---
> > 
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> >
> 
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