On 6/16/2010 6:55 AM, Scott Kaelin wrote:
On Wed, Jun 16, 2010 at 6:03 AM, Orvar Korvar
<knatte_fnatte_tja...@yahoo.com
<mailto:knatte_fnatte_tja...@yahoo.com>> wrote:
"You can't expand a normal RAID, either, anywhere I've ever seen."
Is this true?
Depending on the software/hardware you used this is not true. Highend
HW raid controller support capacity expansion (adding a new drive to
an existing array). There is also an experimental feature (atleast it
was when i used it) of mdadm (linux soft raid) which allows you to do
the same thing (i think they call it modifying the geometry of the
array in their docs) but you need certain kernel features turned on.
--
Scott Kaelin
0x6BE43783
Actually, most modern SCSI and SAS raid controllers support adding a
disk to an existing RAID3/4/5/6 configuration. I know my IBM ServeRAID
controllers do, and they've been doing it since, well, the stone age (or
at least the mid-90s). IIRC, you can do it to it in Solaris Volume
Manager (Disksuite), and even in VxVM supports it, though both do it
imperfectly (or, perhaps, I should say sub-optimally).
While it's a much simpler task to implement in hardware than in
software, it's more difficult than normal for something like ZFS. Not to
say that we *really* could have the BP rewrite stuff finished sometime
soon... <hint><hint>
:-)
--
Erik Trimble
Java System Support
Mailstop: usca22-123
Phone: x17195
Santa Clara, CA
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
