dmesg 내용입니다. 이게 무슨 소릴

SCSI subsystem initialized
megaraid: 2.20.5.1 (Release Date: Thu Nov 16 15:32:35 EST 2006)
megaraid: probe new device 0x101e:0x1960:0x1028:0x0493: bus 5:slot 0:func 0
ACPI: PCI Interrupt 0000:05:00.0[A] -> GSI 21 (level, low) -> IRQ 177
input: ImPS/2 Generic Wheel Mouse as /class/input/input1
megaraid: fw version:[1.74] bios version:[3.27]
scsi0 : LSI Logic MegaRAID driver
scsi[0]: scanning scsi channel 0 [Phy 0] for non-raid devices
Vendor: PE/PV Model: 2x2 SCSI BP Rev: 0.35
Type: Processor ANSI SCSI revision: 02
scsi[0]: scanning scsi channel 1 [Phy 1] for non-raid devices
Vendor: PE/PV Model: 2x3 SCSI BP Rev: 0.35
Type: Processor ANSI SCSI revision: 02
scsi[0]: scanning scsi channel 2 [virtual] for logical drives
Vendor: MegaRAID Model: LD 0 RAID0 69G Rev: 1.74
Type: Direct-Access ANSI SCSI revision: 02
SCSI device sda: 143110144 512-byte hdwr sectors (73272 MB)
sda: Write Protect is off
sda: Mode Sense: 00 00 00 00
sda: asking for cache data failed
sda: assuming drive cache: write through
SCSI device sda: 143110144 512-byte hdwr sectors (73272 MB)
sda: Write Protect is off
sda: Mode Sense: 00 00 00 00
sda: asking for cache data failed
sda: assuming drive cache: write through
sda: sda1 sda2 sda3
sd 0:2:0:0: Attached scsi disk sda
Vendor: MegaRAID Model: LD 1 RAID0 69G Rev: 1.74
Type: Direct-Access ANSI SCSI revision: 02
SCSI device sdb: 143110144 512-byte hdwr sectors (73272 MB)
sdb: Write Protect is off
sdb: Mode Sense: 00 00 00 00
sdb: asking for cache data failed
sdb: assuming drive cache: write through
SCSI device sdb: 143110144 512-byte hdwr sectors (73272 MB)
sdb: Write Protect is off
sdb: Mode Sense: 00 00 00 00
sdb: asking for cache data failed
sdb: assuming drive cache: write through
sdb:
sd 0:2:1:0: Attached scsi disk sdb
Vendor: MegaRAID Model: LD 2 RAID0 69G Rev: 1.74
Type: Direct-Access ANSI SCSI revision: 02
SCSI device sdc: 143110144 512-byte hdwr sectors (73272 MB)
sdc: Write Protect is off
sdc: Mode Sense: 00 00 00 00
sdc: asking for cache data failed
sdc: assuming drive cache: write through
SCSI device sdc: 143110144 512-byte hdwr sectors (73272 MB)
sdc: Write Protect is off
sdc: Mode Sense: 00 00 00 00
sdc: asking for cache data failed
sdc: assuming drive cache: write through
sdc:
sd 0:2:2:0: Attached scsi disk sdc
qla1280: Skipping AMI SubSys Vendor ID Chip
ACPI: PCI Interrupt 0000:00:03.0[A] -> GSI 16 (level, low) -> IRQ 185
scsi1 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 7.0

aic7892: Ultra160 Wide Channel A, SCSI Id=7, 32/253 SCBs

위 내용은 dmesg로 본 내용인데요

이 부분중에 특히

sda: asking for cache data failed
sda: assuming drive cache: write through

이 부분이 무슨 의미인지 궁금합니다.

기존에 centos4x 에서는 이런거 본적이 없는데 이번에 새로 centos5x로 바꾸면서 첨 본 내용같습니다.

서버는 델6650으로 2003년 정도에 구입한 좀 된 서버입니다.

일단 저런 메세지가 떠도 정상적으로 모든 작동(재부팅 등)은 정상적입니다.

다만 저게 먼지 궁금해서요 ....