5 Jun
2016
5 Jun
'16
1:26 a.m.
So in short i have six identical drives. Same manufacture, model, and
firmware. Three of them work fine, the other three also work fine but
they always show up as the wrong target.
For example i have a Sun D1000 storage array with 12 slots (targets
0-11). It doesn't matter what slot you put them in, these three drives
always have the same target number. One is target 8, on target 4, one
target 2. I doesn't matter one of the drives is by itself or together
with other drives.
Take the disk that always shows up as target two for example. If you
place this drive in slot zero, then place a normal working drive in slot
2, and finally attempt to write data to target 2 both drives will get
the write. The same effect also applies to reads. If you boot an OS with
the drives in this configuration you will usually get a panic.
I can verify the same behavior on my Sum V210 and Dell PE 2850. This is
such a bizarre way for a disk to act / fail. Has anyone ever seen this
before?
5 Jun
5 Jun
5:25 a.m.
On Sun, Jun 5, 2016 at 7:26 AM, <alexmcwhirter at triadic.us> wrote:
So in short i have six identical drives. Same
manufacture, model, and
firmware. Three of them work fine, the other three also work fine but they
always show up as the wrong target.
Is there a jumper on the drives that is overriding the address
assigned by the enclosure? The whole point of SCA is that you don't
use jumpers to assign the drive address, it just figures it out
somehow. It sounds like the SCA isn't being allowed to do its thing.
10:28 a.m.
On 2016-06-05 6:25 AM, Jonathan Katz wrote:
On Sun, Jun 5, 2016 at 7:26 AM, <alexmcwhirter at
triadic.us> wrote:
The SCA
connectors has pins on it for setting the drive address, so the
the disk backplane slot that the drive is plugged into sets the drive
address. These drives normally have jumper positions on them to set
addresses as well, however the normal case is that the actual address is
the backplane set address ORed with what is set in the jumpers. For
instance if the drive has a jumper for address 2 set, and you plug it
into the address 0 slot it will respond to address 2, but if you plug it
into the address 1 slot it will respond to address 3, but when plugged
into slot with address 2 it will correctly respond to 2. The OP claims
that these
drives respond to the same address no matter where they are plugged,
which does not seem possible on any SCA drive I have ever seen.
If the drives happen to have 50 or 68 pin connectors that are mounted on
a carrier with a connector that plugs into a backplane that sets an
address, in this case this is normally done with a small cable that
connects the auxiliary connector on the drive to the appropriate pins on
the carrier, in that case if this cable is disconnected and address
jumpers are installed on the drive, I could see the OP's situation
occurring.
I have no experience with Sun disk enclosures so I don't know what sort
of drives or drive carriers they use in their enclosures so I cannot say
for sure what may be going wrong.
Paul.
So in short i have six identical drives. Same
manufacture, model, and
firmware. Three of them work fine, the other three also work fine but they
always show up as the wrong target.
Is there a jumper on the drives that is
overriding the address
assigned by the enclosure? The whole point of SCA is that you don't
use jumpers to assign the drive address, it just figures it out
somehow. It sounds like the SCA isn't being allowed to do its thing.
2:50 p.m.
On 2016-06-05 10:28, Paul Berger wrote:
It sounds like the SCA isn't being allowed to do
its thing.
The SCA connectors has pins on it for setting the drive address, so
the the disk backplane slot that the drive is plugged into sets the
drive address. These drives normally have jumper positions on them to
set addresses as well, however the normal case is that the actual
address is the backplane set address ORed with what is set in the
jumpers. For instance if the drive has a jumper for address 2 set,
and you plug it into the address 0 slot it will respond to address 2,
but if you plug it into the address 1 slot it will respond to address
3, but when plugged into slot with address 2 it will correctly respond
to 2. The OP claims that these
drives respond to the same address no matter where they are plugged,
which does not seem possible on any SCA drive I have ever seen.
If the drives happen to have 50 or 68 pin connectors that are mounted
on a carrier with a connector that plugs into a backplane that sets an
address, in this case this is normally done with a small cable that
connects the auxiliary connector on the drive to the appropriate pins
on the carrier, in that case if this cable is disconnected and address
jumpers are installed on the drive, I could see the OP's situation
occurring.
I have no experience with Sun disk enclosures so I don't know what
sort of drives or drive carriers they use in their enclosures so I
cannot say for sure what may be going wrong.
Paul.
So the D1000 is mostly a dumb box. It only has functions to set
addresses and power on / off the drives. It uses standard SCA scsi
drives, nothing fancy. Anyways, yes one of the drives shows up as target
two no matter what slot it's in. If there is another drive in slot two
the target id's will conflict.
There are no pins on these drives, and the exhibit the same behavior in
other machines. I just find it weird, hopefully the other three drives
don't start doing the same thing.
2970
days inactive
2970
days old
3 comments
3 participants
participants (3)
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alexmcwhirter＠triadic.us -
jon＠jonworld.com -
phb.hfx＠gmail.com