MC stated:
< > On Thu, 24 May 2007, MC wrote:
< >
< > > An advantage Linux has over both Solaris and
< > Windows is that Linux
< > > software RAID supports adding disks to an existing
< > array.
< >
< > Bzzzt...wrong answer. ZFS supports software RAID
< > (zraid) and allows you to
< > toss disks at the pool in any way you want. You can
< > add them in pairs and
< > mirror them, just toss them in, or do a number of
< > other things with them
< > such as creating serpate pools and/or filesystems.
<
< I don't believe that is the case. What I'm talking about is "growing an
array with devices". So you have 3 disks in a raid5/raidz array, and then you
add another disk, causing the free space on the array to grow from (3-1) disks
worth of space to (4-1) disks worth of space. Data is preserved across this
growth.
<
< Linux can achieve the above with four commands. They amount to expanding the
array into the extra disk, and then expanding the file system into the full
array. ( http://scotgate.org/?p=107 )
<
< This topic has come up many times on the ZFS forums, and even then it is hard
to get a straight answer. I blame that on a non-standard vocabulary
surrounding these topics. Grow, array, pool, etc... lots of confusion and
ambiguity there. But by the end of each question thread, an authoritative
answer shows up:
http://www.opensolaris.org/jive/thread.jspa?messageID=108195#108195
<
< So unless something has changed since April, only Linux (and a number of
hardware solutions) support growing raid5 arrays with devices.
Indeed SVM has been able to so as well, Solaris 9 in fact could.
(SVM == Solaris Volume Manager)
An example from the Solaris 9 docs..
How to Expand a RAID 5 Volume
http://docs.sun.com/app/docs/doc/817-2530/6mi6gg896?a=view
Solaris 9 was released sometime before April I believe.
Googling for 'windows expand raid 5' throws up about 943,000 results.
perhaps one of those may explain how to do so on that OS.
Windows too it seems to have been about since before April.
Regards,
--
Sean.
.
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