Re: Scuzzy drives

At Fri, 01 Jun 2007 14:51:38 -0500 Ignoramus27006 <ignoramus27006@xxxxxxxxxxxxxxxxxxxx> wrote:


On Fri, 01 Jun 2007 12:32:02 -0700, Jim Moe <jmm-list.AXSPAMGN@xxxxxxxxxxxxxx> wrote:
Ignoramus27006 wrote:
Are SCSI drives hot pluggable? We have a linux werver (FC6) where our
system guy just inserted two scsi drives (little server grade
drives). No new related messages appeared in /var/log/messages. Do I
need to reboot to see those drives?

It depends. Yes. No. (There is a certain dearth of information.)
Is your drive bay a RAID unit? If so, your storage capacity just
increases as more or larger drives are added to it.
If the drives were just to your personal computer (no RAID), you must
partition and format the drives yourself.


There is some RAID feature, yes, the first two drives are RAID. I am
now completely confused. The df command does not seem to show
increased space.

Software or Hardware RAID?

If software, you need to:

1) Get the SCSI controller to see them (should be automagical)
and for the driver to see them (tweeking /proc/scsi/scsi as Dances With
Crows wrote).
2) Update the software RAID conf. This may require a reboot.


If hardware RAID, it depends on your RAID controller. *Some*
controllers automagically grow the RAID, others need to have their
configuration updated. Some can do this on a live system others need
to be down at 'firmware' level (requires a reboot).

Generally, randomly just sticking additional disks into a SCSI drive
bay does not do very much *by itself*. You need to do some System Admin
work as well. That is, once the hardware tech. has done *his* job
(mounting the drives on the 'sleds' and shoving them into the bay), the
System Admin needs to earn *his* paycheck (logging onto the system
console and messing with one or more configuation utilities). If you
have a hardware RAID-5 system and you are just swaping a bad drive out,
many RAID controllers with automagically do a rebuild, although some
will need to be nudged (sent a message that the bad drive has been
replace).


i


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