Yesterday I noticied the following text in dmesg, which was
here for a long time:
SCSI subsystem initialized
Adaptec aacraid driver (1.1-4 Feb 19 2006 18:08:14)
ACPI: PCI Interrupt 0000:04:02.0[A] -> GSI 52 (level, low) -> IRQ 169
AAC0: kernel 4.2-0[7348]
AAC0: monitor 4.2-0[7348]
AAC0: bios 4.2-0[7348]
AAC0: serial c3c8bf
scsi0 : aacraid
Vendor: Adaptec Model: 1 Rev: V1.0
Type: Direct-Access ANSI SCSI revision: 02
SCSI device sda: 580452352 512-byte hdwr sectors (297192 MB)
sda: Write Protect is off
sda: Mode Sense: 03 00 00 00
sda: got wrong page
sda: assuming drive cache: write through
SCSI device sda: 580452352 512-byte hdwr sectors (297192 MB)
sda: Write Protect is off
sda: Mode Sense: 03 00 00 00
sda: got wrong page
sda: assuming drive cache: write through
sda: sda1 sda2 sda3 sda4 < sda5 sda6 >
sd 0:0:0:0: Attached scsi removable disk sda
There are several questions about it.
o What's this "got wrong page" message and "Mode sense" stuff?
It looks like sd_mod (or whatever) wants to get some info from
the "drive" (which is a virtual scsi drive, it's a raid array
in reality), and hardware returns something unexpected. Is it
a controller issue?
o Why linux "thinks" it's a removable disk? It's not removable
in any sense. I dunno how the fact that it's "removable"
affects other I/O operations, but the fact itself is somewhat
strange.
Also, I noticied this:
# hdparm -t /dev/sda
Timing buffered disk reads: 210 MB in 3.00 seconds = 70.00 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device
What does it mean, and should i be concerned? It looks like the
drive (some "part" of it anyway, be it the controller, or driver,
or physical drives) does not implement a command which is useful
and even important to ensure proper write ordering/commits.
The above output is from 2.6.15.4 kernel, but looking at syslog
it seems the same behaviour was here for a long time, at least
since 2.6.11 (first log entry I have).
The controller is like this (from lspci):
0000:04:02.0 RAID bus controller: Adaptec AAC-RAID (rev 01)
Subsystem: Adaptec AAR-21610SA PCI SATA 16ch (Corsair-16)
Flags: bus master, 66MHz, slow devsel, latency 64, IRQ 169
Memory at f8000000 (32-bit, prefetchable) [size=64M]
Expansion ROM at feaf8000 [disabled] [size=32K]
Capabilities: [80] Power Management version 2
Thanks.
/mjt
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