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Old 09-02-2006, 10:24 PM   #1
DBabo
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SCSI controllers and drives.


Guys:

this is from the RHEL3 ( 2.4 kernel ), part of the messages file :

Aug 28 15:01:27 somehost kernel: SCSI subsystem driver Revision: 1.00
Aug 28 15:01:27 somehost kernel: scsi0 : Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev 1.3.10-RH1
Aug 28 15:01:27 somehost kernel: <Adaptec AIC7902 Ultra320 SCSI adapter>
Aug 28 15:01:27 somehost kernel: aic7902: Ultra320 Wide Channel A, SCSI Id=7, PCI 33 or 66Mhz, 512 SCBs
Aug 28 15:01:27 somehost kernel:
Aug 28 15:01:27 somehost kernel: scsi1 : Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev 1.3.10-RH1
Aug 28 15:01:27 somehost kernel: <Adaptec AIC7902 Ultra320 SCSI adapter>
Aug 28 15:01:27 somehost kernel: aic7902: Ultra320 Wide Channel B, SCSI Id=7, PCI 33 or 66Mhz, 512 SCBs
Aug 28 15:01:27 somehost kernel:
Aug 28 15:01:27 somehost kernel: blk: queue ca15f618, I/O limit 524287Mb (mask 0x7fffffffff)
Aug 28 15:01:27 somehost kernel: (scsi0:A:0): 320.000MB/s transfers (160.000MHz DT|IU|RTI, 16bit)
Aug 28 15:01:27 somehost kernel: (scsi0:A:1): 320.000MB/s transfers (160.000MHz DT|IU|RTI, 16bit)
Aug 28 15:01:27 somehost kernel: (scsi0:A:2): 320.000MB/s transfers (160.000MHz DT|IU|RTI, 16bit)
Aug 28 15:01:27 somehost kernel: (scsi0:A:3): 320.000MB/s transfers (160.000MHz DT|IU|RTI, 16bit)
Aug 28 15:01:27 somehost kernel: Vendor: SEAGATE Model: ST3146807LW Rev: DS10
Aug 28 15:01:27 somehost kernel: Type: Direct-Access ANSI SCSI revision: 03
Aug 28 15:01:27 somehost kernel: blk: queue ca15f418, I/O limit 524287Mb (mask 0x7fffffffff)
Aug 28 15:01:27 somehost kernel: Vendor: SEAGATE Model: ST3146807LW Rev: DS10
Aug 28 15:01:27 somehost kernel: Type: Direct-Access ANSI SCSI revision: 03
Aug 28 15:01:27 somehost kernel: blk: queue ca0f2e18, I/O limit 524287Mb (mask 0x7fffffffff)
Aug 28 15:01:27 somehost kernel: Vendor: SEAGATE Model: ST3146807LW Rev: DS10
Aug 28 15:01:27 somehost kernel: Type: Direct-Access ANSI SCSI revision: 03
Aug 28 15:01:27 somehost kernel: blk: queue ca0f2c18, I/O limit 524287Mb (mask 0x7fffffffff)
Aug 28 15:01:27 somehost kernel: Vendor: SEAGATE Model: ST3146807LW Rev: DS10
Aug 28 15:01:27 somehost kernel: Type: Direct-Access ANSI SCSI revision: 03
Aug 28 15:01:27 somehost kernel: blk: queue ca0f2a18, I/O limit 524287Mb (mask 0x7fffffffff)
Aug 28 15:01:27 somehost kernel: scsi0:A:0:0: Tagged Queuing enabled. Depth 32
Aug 28 15:01:27 somehost kernel: scsi0:A:1:0: Tagged Queuing enabled. Depth 32
Aug 28 15:01:27 somehost kernel: scsi0:A:2:0: Tagged Queuing enabled. Depth 32
Aug 28 15:01:27 somehost kernel: scsi0:A:3:0: Tagged Queuing enabled. Depth 32
Aug 28 15:01:27 somehost kernel: Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
Aug 28 15:01:27 somehost kernel: Attached scsi disk sdb at scsi0, channel 0, id 1, lun 0
Aug 28 15:01:27 somehost kernel: Attached scsi disk sdc at scsi0, channel 0, id 2, lun 0Aug 28 15:01:27 somehost kernel: Attached scsi disk sdd at scsi0, channel 0, id 3, lun 0
Aug 28 15:01:27 somehost kernel: SCSI device sda: 286749480 512-byte hdwr sectors (146816 MB)
Aug 28 15:01:27 somehost kernel: sda: sda1 sda2 sda3 sda4 < sda5 sda6 sda7 sda8 sda9 sda10 >
Aug 28 15:01:27 somehost kernel: SCSI device sdb: 286749480 512-byte hdwr sectors (146816 MB)
Aug 28 15:01:27 somehost kernel: sdb: sdb1 sdb2
Aug 28 15:01:28 somehost kernel: SCSI device sdc: 286749480 512-byte hdwr sectors (146816 MB)
Aug 28 15:01:28 somehost kernel: sdc: sdc1 sdc2
Aug 28 15:01:28 somehost kernel: SCSI device sdd: 286749480 512-byte hdwr sectors (146816 MB)
Aug 28 15:01:28 somehost kernel: sdd: sdd1
Aug 28 15:01:28 somehost kernel: blk: queue ca028c18, I/O limit 524287Mb (mask 0x7fffffffff)
Aug 28 15:01:28 somehost kernel: ata1: SATA max UDMA/133 cmd 0xFE00 ctl 0xFE12 bmdma 0xFEA0 irq 18
Aug 28 15:01:28 somehost kernel: ata2: SATA max UDMA/133 cmd 0xFE20 ctl 0xFE32 bmdma 0xFEA8 irq 18
Aug 28 15:01:28 somehost kernel: ata1: SATA port has no device.
Aug 28 15:01:28 somehost cups: cupsd startup succeeded
Aug 28 15:01:28 somehost kernel: ata2: SATA port has no device.
Aug 28 15:01:28 somehost kernel: scsi2 : ata_piix
Aug 28 15:01:28 somehost kernel: scsi3 : ata_piix
Aug 28 15:01:28 somehost kernel: LVM version 1.0.8-2(26/05/2004) module loaded
Aug 28 15:01:28 somehost kernel: Journalled Block Device driver loaded

-- end of quote --

Do i read this correctly that :
1. all 4 drives ( scsi ) attached to the same controller.
2. the speed of the data transfer is 320.000MB/s. Is this bits or bytes?
 
Old 09-03-2006, 04:14 AM   #2
ilpadrino
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1.- Yes, everybody have a single one scsi controller. It is not necessary to have more than one (for typical scsi devices)

2.- Bytes. Note that MB means MegaBytes and Mb means Megabits.

Regards
 
Old 09-03-2006, 08:27 AM   #3
michaelk
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FYI.
This SCSI controller has 2 channels which means you can connect up to 30 devices. 15 devices per channel. The SCSI controller typically is assigned bus ID 7.
The transfer rate is 320 MByte/sec/channel. However, typically the bus is only as fast as the slowest connected device.
 
Old 09-03-2006, 09:59 PM   #4
DBabo
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all right. thank you.
Now:
(scsi0:A:0): 320.000MB/s transfers - means that controller can pass up to ~ 320 GBytes per sec.

If i'm not totaly drunk it means that ( and as you guys noted) i don't care ( from the performance perspective ) how many drives are hanging off it, casue they jsut can't push so much data through it. Correct?

the drives :
I/O limit 524287Mb - means the throughoutput ? roughly 1/5 GBytes per sec??
 
  


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