Re: Spinning down an old disk array
- From: "H Vlems" <hvlems@xxxxxxxxxx>
- Date: Fri, 12 Sep 2008 22:20:49 +0200
"JF Mezei" <jfmezei.spamnot@xxxxxxxxxxxxx> schreef in bericht
news:48cac674$0$9668$c3e8da3@xxxxxxxxxxxxxxxxxxxx
FWIW:JF, the RD54 and RD53 (Maxtor disks IIRC) and both models have short
Back when I ran my all mighty Microvax II on RD54, I was concerned about
its age. But the RD54 never quit. But I was given an RD53 and I
connected it and it worked. It started to log a few errors. So I
shutdown the system to check connectiosn etc, and when I restarted it,
the RD53 started to spin up, but never accelereated to normal speed.
(the way I saw it, it was like when a jet aircraft starts an engine, the
engine starts to spin from the starter, but it is only once they apply
the fuel and ignite it that it *really* starts to spin up. That disk was
like in "starter" mode and didn't ignite...
lifespans, say 12 to 14 years when used (switched on) most of the time.
Possibly Maxtor designed these disks for a much shorter MTBF, no idea. But
SCSI devices tend to live a lot longer.
Motor and bearing failures are noticable, sudden loud noise usually hight
But for a newer generation SCSI disk (250meg), it had come off an old
mac. It started to log errors while running. Not sure if it was the
motor failing or the heads/surface.
pitched is a bad sign.
Though I have a couple of Barracuda's that scream as if tortured but
otherwise perform well and errorfree.
You're referring to power surges at startup time, right? I'm sure the effect
In the case of a disk array, my concern would be with regards to power.
If you are goin to power up the whole thing, does it have logic to
sequentially power up drives, or would they all get their power at the
same time ? Are they set to spin up automatically, or await a spin up
command from the SCSI bus ?
is there but these disks are no RA81's :-)
Besides those disks were wired to start up sequentially otherwise they'd
blow a fuse.
If you could power up the drives one after the other, it might be betterYou've got a point here, unless the diskbays have dual power supplies.
because of less strain on the power supply and each drive would then
not see as big of a power spike. You could also more easily see which
drive is spinning up and which isn't.
If they have been running for that long without many interruptions and
in good environment (temperature not too hot) I woudln't be *too*
worried about then not spinning up.
Would starting those disks while still warm be easier ? I am thinking if
there is any oil in the motor, bearings whatever, old oil might seize if
allowed to cool down and offer more resistance to a power up, whereas if
still warm, it would still be fluid ? Would that be a concern, or is
that totally offbase ?
The heads are parked in a landing zone. Which may be a very rarely used
location. Once the heads are there they may get stuck in that position. The
motor bearing(s) would worry me. When the disk bearing was perpendicular to
gravity (disk on its side) the low side of the bearing would wear out a
little more that the topside. When shutdown and power off, the bearing cools
down and the metal will shrink (very little but will be there). The spindle
might get stuck in the worn out bearing and never spin up again. After a
short while I guess the motor will burn out.
Hans
.
- References:
- Spinning down an old disk array
- From: Peter Weaver
- Re: Spinning down an old disk array
- From: H Vlems
- Re: Spinning down an old disk array
- From: JF Mezei
- Spinning down an old disk array
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