| pofcorn |
03-16-2007 03:10 PM |
How to force write cache mode on aacraid?
Hi,
I have an IBM xSeries 366 with 2 ServeRAID cards.
A Serveraid 8i is installed in its dedicated slot. 2 70 gig SAS drives configured in Raid 1.
A Serveraid 6m installed in a PCIX slot, connected to a EXP400 (external hard drives enclosure). 2 300 gig drives installed in the EXP400 configured in Raid 1.
I configured the cards and arrays using the Serveraid bootable CD. I set the 2 cards in write-back mode.
The 2 cards install and work fine under Ubuntu 6.06.
However, Ubuntu keeps setting them in write-through mode. This is not optimal because both cards have a battery-backed cache, so there is no risk of data loss.
I would like to know if there is a way to force the aacraid driver to use write-back mode.
Here is the relevant output from dmesg
Code:
160.915444 SCSI subsystem initialized
160.916690 Adaptec aacraid driver (1.1-4 Feb 1 2007 17:03:23)
160.916753 GSI 16 sharing vector 0xA9 and IRQ 16
160.916759 ACPI: PCI Interrupt 0000:01:02.0A -> GSI 25 (level, low) -> IRQ 169
160.931279 AAC0: kernel 5.2-011835
160.931283 AAC0: monitor 5.2-011835
160.931285 AAC0: bios 5.2-011835
160.931288 AAC0: serial 163933
160.931290 AAC0: 64bit support enabled.
160.931292 AAC0: 64 Bit DAC enabled
160.931616 scsi0 : ServeRAID
160.931820 Vendor: IBM Model: Systeme Rev: V1.0
160.931833 Type: Direct-Access ANSI SCSI revision: 02
160.957862 Driver 'sd' needs updating - please use bus_type methods
160.957947 SCSI device sda: 143155200 512-byte hdwr sectors (73295 MB)
160.957960 sda: Write Protect is off
160.957963 sda: Mode Sense: 03 00 00 00
160.957985 sda: got wrong page
160.958408 sda: assuming drive cache: write through
160.959081 SCSI device sda: 143155200 512-byte hdwr sectors (73295 MB)
160.959098 sda: Write Protect is off
160.959100 sda: Mode Sense: 03 00 00 00
160.959127 sda: got wrong page
160.959539 sda: assuming drive cache: write through
160.960106 sda: sda1 sda2 sda3 sda4 < sda5 sda6 >
160.989401 sd 0:0:0:0: Attached scsi removable disk sda
161.297934 GSI 17 sharing vector 0xB1 and IRQ 17
161.297942 ACPI: PCI Interrupt 0000:05:08.0A -> GSI 19 (level, low) -> IRQ 177
161.337077 scsi1 : IBM PCI ServeRAID 7.12.05 Build 761 <ServeRAID 6M>
161.337285 Vendor: IBM Model: SERVERAID Rev: 1.00
161.337300 Type: Direct-Access ANSI SCSI revision: 02
161.337494 SCSI device sdb: 585936896 512-byte hdwr sectors (300000 MB)
161.338008 sdb: got wrong page
161.338428 sdb: assuming drive cache: write through
161.339204 SCSI device sdb: 585936896 512-byte hdwr sectors (300000 MB)
161.339715 sdb: got wrong page
161.340127 sdb: assuming drive cache: write through
161.340700 sdb: sdb1
161.357123 sd 1:0:0:0: Attached scsi disk sdb
161.358673 Vendor: IBM Model: SERVERAID Rev: 1.00
161.358687 Type: Processor ANSI SCSI revision: 02
161.362684 Vendor: IBM-ESXS Model: MAW3300NC FN Rev: C206
161.362705 Type: Direct-Access ANSI SCSI revision: 04
161.363538 SCSI device sdc: 585937500 512-byte hdwr sectors (300000 MB)
161.365022 SCSI device sdc: drive cache: write through
161.366086 SCSI device sdc: 585937500 512-byte hdwr sectors (300000 MB)
161.367554 SCSI device sdc: drive cache: write through
161.367559 sdc: sdc1
161.383362 sd 1:1:0:0: Attached scsi disk sdc
161.386814 Vendor: IBM-ESXS Model: MAW3300NC FN Rev: C206
161.386828 Type: Direct-Access ANSI SCSI revision: 04
161.388275 SCSI device sdd: 585937500 512-byte hdwr sectors (300000 MB)
161.389599 SCSI device sdd: drive cache: write through
161.390323 SCSI device sdd: 585937500 512-byte hdwr sectors (300000 MB)
161.391650 SCSI device sdd: drive cache: write through
161.391657 sdd: sdd1
161.392986 sd 1:1:1:0: Attached scsi disk sdd
161.429957 Vendor: IBM Model: EXP400 S320 Rev: D110
161.429973 Type: Processor ANSI SCSI revision: 03
What's weird is that the system is able to detect the physical drives under the enclosure (sdc and sdd) but I don't think it's a problem, I don't mount them or anything.
Thanks. |
