Number of SCSI drives
To All: I have the following setup: ADVANSYS dual channel scsi: Channel 1 2 x 36 GB sda (ID0) & sdb (ID2) Channel 2 2 x 18 GB sdc (ID1) & sdd (ID2) Adaptec 2940 UW sde (ID0) - IBM 2GB sdf (ID1) - Quatum 9GB sdg (ID3) - Quantum 4.5 GB --- (ID4) - Seagate 2GB sdh (ID5) - Quantum 4.5 GB --- (ID6) - IBM 2GB Why aren't the drives at ID4 & ID 6 being detected by Linux during boot? Both drives show up in the Adaptec bios. Is this a cable limitation? If so why do all drives show up in the Adaptec bios but not under Linux? Are there additioal paramters I need to provide to have Linux detect all six drives? I searched the FAQ, SCSI HOWTO, and GOOGLE, but did not find anything directly applicable. I am trying to string the drives on the Adaptec controller in a RAID 0 configuration (strip set). Any thoughts would be appreciated. Thanks db Following is boot log (note that there are no errors on boot): <4>Attached scsi disk sda at scsi0, channel 0, id 0, lun 0 <4>Attached scsi disk sdb at scsi0, channel 0, id 2, lun 0 <4>Attached scsi disk sdc at scsi1, channel 0, id 1, lun 0 <4>Attached scsi disk sdd at scsi1, channel 0, id 2, lun 0 <4>Attached scsi disk sde at scsi2, channel 0, id 0, lun 0 <4>Attached scsi disk sdf at scsi2, channel 0, id 1, lun 0 <4>Attached scsi disk sdg at scsi2, channel 0, id 3, lun 0 <4>Attached scsi disk sdh at scsi2, channel 0, id 5, lun 0 <4>SCSI device sda: 71132960 512-byte hdwr sectors (36420 MB) <6> sda: sda1 <4>SCSI device sdb: 71132960 512-byte hdwr sectors (36420 MB) <6> sdb: sdb1 <4>SCSI device sdc: 35566480 512-byte hdwr sectors (18210 MB) <6> sdc: sdc1 <4>SCSI device sdd: 35566480 512-byte hdwr sectors (18210 MB) <6> sdd: sdd1 <4>SCSI device sde: 4226725 512-byte hdwr sectors (2164 MB) <6> sde: <4>SCSI device sdf: 17781520 512-byte hdwr sectors (9104 MB) <6> sdf: <4>SCSI device sdg: 8899737 512-byte hdwr sectors (4557 MB) <6> sdg: <4>SCSI device sdh: 8899737 512-byte hdwr sectors (4557 MB) <6> sdh:
To All:
I have the following setup:
ADVANSYS dual channel scsi: Channel 1 2 x 36 GB sda (ID0) & sdb (ID2) Channel 2 2 x 18 GB sdc (ID1) & sdd (ID2)
Adaptec 2940 UW sde (ID0) - IBM 2GB sdf (ID1) - Quatum 9GB sdg (ID3) - Quantum 4.5 GB --- (ID4) - Seagate 2GB sdh (ID5) - Quantum 4.5 GB --- (ID6) - IBM 2GB
Why aren't the drives at ID4 & ID 6 being detected by Linux during boot? Both drives show up in the Adaptec bios. Is this a cable limitation? If so why do all drives show up in the Adaptec bios but not under Linux? Are there additioal paramters I need to provide to have Linux detect all six drives? I searched the FAQ, SCSI HOWTO, and GOOGLE, but did not find anything directly applicable.
I am trying to string the drives on the Adaptec controller in a RAID 0 configuration (strip set).
Any thoughts would be appreciated.
I can't help on the recognition side, but I hope you have very little needs for reliability from your RAID 0 setup. With a 6 drive RAID 0, the odds of a failure are 6 times what they are for a simple drive. So if the above used drives have a 3-year mean lifetime before failure, then your RAID 0 is likely to fail every 6 months or so. Greg
On Mon August 23 2004 1:51 pm, david brenner wrote:
To All:
Why aren't the drives at ID4 & ID 6 being detected by Linux during boot? Both drives show up in the Adaptec bios. Is this a cable limitation? If so why do all drives show up in the Adaptec bios but not under Linux? Are there additioal paramters I need to provide to have Linux detect all six drives?
I am trying to string the drives on the Adaptec controller in a RAID 0 configuration (strip set).
Any thoughts would be appreciated.
Thanks
db
I'd double-check and then triple-check the termination settings of the drives and cable and controller, SCSI ID settings of all the drives and try at least one other SCSI cable on all the devices on the Adaptec. Then I'd also check the power supply for the system and make triple sure you have enough power for all these devices. I don't think a 400 watt supply would be adequate to handle all these plus CD drives, video card, NIC(s), etc. When doing a RAID 0, all these older drives will be spinning and accessing all the time using lots of power. Newer drives may have 10x the capacity but they will use as much power as these older drives. 10 drives and how bug is the power supply? And what else is in the system? Stan
On Monday 23 August 2004 04:07 pm, SRGlasoe wrote:
Why aren't the drives at ID4 & ID 6 being detected by Linux during boot?
Both drives show up in the Adaptec bios. Is this a cable limitation? If so why do all drives show up in the Adaptec bios but not under Linux? Are there additioal paramters I need to provide to have Linux detect all six drives?
Is the aic7xxx module loaded? The install may not have taken care of two scsi controllers. lsmod | grep aic or look into /etc/sysconfig/kernel for INITRD_MODULES and see if aic7xxx is in the initrd list. My guess is that it isn't. -- +----------------------------------------------------------------------------+ + Bruce S. Marshall bmarsh@bmarsh.com Bellaire, MI 08/23/04 19:36 + +----------------------------------------------------------------------------+ "Doctrine is nothing but the skin of truth set up and stuffed." - Beecher
participants (4)
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Bruce Marshall -
david brenner -
Greg Freemyer -
SRGlasoe