Bad iostat numbers
| От | Carlos H. Reimer |
|---|---|
| Тема | Bad iostat numbers |
| Дата | |
| Msg-id | PEEPKDFEHHEMKBBFPOOKKEHCDKAA.carlos.reimer@opendb.com.br обсуждение исходный текст |
| Ответы |
Re: Bad iostat numbers
(Mark Kirkwood <markir@paradise.net.nz>)
Re: Bad iostat numbers (David Boreham <david_list@boreham.org>) Re: Bad iostat numbers (Greg Smith <gsmith@gregsmith.com>) |
| Список | pgsql-performance |
avg-cpu: %user %nice %system %iowait %idle
50.40 0.00 0.50 1.10 48.00
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 7.80 0.40 6.40 41.60 113.60 20.80 56.80 22.82 570697.50 10.59 147.06 100.00
sdb 0.20 7.80 0.60 6.40 40.00 113.60 20.00 56.80 21.94 570697.50 9.83 142.86 100.00
md1 0.00 0.00 1.20 13.40 81.60 107.20 40.80 53.60 12.93 0.00 0.00 0.00 0.00
md0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Are they not saturated?
What kind of parameters should I pay attention when comparing SCSI controllers and disks? I would like to discover how much cache is present in the controller, how can I find this value from Linux?
Thank you in advance!
dmesg output:
...
SCSI subsystem initialized
ACPI: PCI Interrupt 0000:04:02.0[A] -> GSI 18 (level, low) -> IRQ 18
scsi0 : Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev 3.0
<Adaptec (Dell OEM) 39320 Ultra320 SCSI adapter>
aic7902: Ultra320 Wide Channel A, SCSI Id=7, PCI 33 or 66Mhz, 512 SCBs
Vendor: SEAGATE Model: ST336607LW Rev: DS10
Type: Direct-Access ANSI SCSI revision: 03
target0:0:0: asynchronous
scsi0:A:0:0: Tagged Queuing enabled. Depth 4
target0:0:0: Beginning Domain Validation
target0:0:0: wide asynchronous
target0:0:0: FAST-160 WIDE SCSI 320.0 MB/s DT IU QAS RDSTRM RTI WRFLOW PCOMP (6.25 ns, offset 63)
target0:0:0: Ending Domain Validation
SCSI device sda: 71132959 512-byte hdwr sectors (36420 MB)
sda: Write Protect is off
sda: Mode Sense: ab 00 10 08
SCSI device sda: drive cache: write back w/ FUA
SCSI device sda: 71132959 512-byte hdwr sectors (36420 MB)
sda: Write Protect is off
sda: Mode Sense: ab 00 10 08
SCSI device sda: drive cache: write back w/ FUA
sda: sda1 sda2 sda3
sd 0:0:0:0: Attached scsi disk sda
Vendor: SEAGATE Model: ST336607LW Rev: DS10
Type: Direct-Access ANSI SCSI revision: 03
target0:0:1: asynchronous
scsi0:A:1:0: Tagged Queuing enabled. Depth 4
target0:0:1: Beginning Domain Validation
target0:0:1: wide asynchronous
target0:0:1: FAST-160 WIDE SCSI 320.0 MB/s DT IU QAS RDSTRM RTI WRFLOW PCOMP (6.25 ns, offset 63)
target0:0:1: Ending Domain Validation
SCSI device sdb: 71132959 512-byte hdwr sectors (36420 MB)
sdb: Write Protect is off
sdb: Mode Sense: ab 00 10 08
SCSI device sdb: drive cache: write back w/ FUA
SCSI device sdb: 71132959 512-byte hdwr sectors (36420 MB)
sdb: Write Protect is off
sdb: Mode Sense: ab 00 10 08
SCSI device sdb: drive cache: write back w/ FUA
sdb: sdb1 sdb2 sdb3
sd 0:0:1:0: Attached scsi disk sdb
ACPI: PCI Interrupt 0000:04:02.1[B] -> GSI 19 (level, low) -> IRQ 19
scsi1 : Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev 3.0
<Adaptec (Dell OEM) 39320 Ultra320 SCSI adapter>
aic7902: Ultra320 Wide Channel B, SCSI Id=7, PCI 33 or 66Mhz, 512 SCBs
...
В списке pgsql-performance по дате отправления: