Hi folks,
Well I think I'm out of ideas in my experience with gvinum. I need
some help.
I cannot get gvinum to work for me at all in setting up a raid5
set. This is the first FreeBSD gizmo that I've run into that has
proven dangerously unreliable. Each time I use it I get a panic, and
one of these tries kept the machine from booting until I did a
bsdlabel -B /dev/adxx for each of three drives. (it just did it again)
I was surprised that even a dd if=/dev/zero of=/dev/adxx would not
clean up things. I read somewhere that geom does something
preventing overwrite of parts of the device.
I'm hoping someone will point out something I'm doing horribly wrong.
Synopsis:
The drives in question are ad4, ad8 and ad10 all identical disks.
One attempt under amd64 6.0 release with this gvinum patch I get
panics with i386 6.1-RC1
http://wikitest.freebsd.org/moin.cgi/GvinumMoveRename
bsd2# cat vinum_r5.config
drive a device /dev/ad4s1d
drive b device /dev/ad8s1d
drive c device /dev/ad10s1d
volume r5vol
plex org raid5 15g
sd length 5g drive a
sd length 5g drive b
sd length 5g drive c
bsd2# cat sdisk.bsdlabel
# for vinum configuraiton
# good for /dev/ad4s1 /dev/ad8s1 and /dev/ad10s1
#
#
# /dev/ad4s1:
8 partitions:
# size offset fstype [fsize bsize bps/cpg]
a: 390721889 16 unused 0 0
c: 390721905 0 unused 0 0 # "raw"
part, don't edit
d: 50g 17 vinum
bsd2# cat clean.sh
dd if=/dev/zero of=/dev/ad4 bs=1k count=100
fdisk -I ad4
bsdlabel -R /dev/ad4s1 sdisk.bsdlabel
dd if=/dev/zero of=/dev/ad8 bs=1k count=100
fdisk -I ad8
bsdlabel -R /dev/ad8s1 sdisk.bsdlabel
dd if=/dev/zero of=/dev/ad10 bs=1k count=100
fdisk -I ad10
bsdlabel -R /dev/ad10s1 sdisk.bsdlabel
The story so far:
I recently purchased a Gigabyte GA-8VT880P (VIA PT880 Pro Chipset)
and put an Intel Celeron D 336 (Intel EMB64T) processor in it. I
suppose by today's standards this is a pretty low end board but it's
way fast for what I need.
On this system the MB was replacing an older AMD Athalon board. I'm
using this system to study an upgrade path to a 4.7 system I'm
running. I stupidly decided to install the 6.0-RELEASE amd64. At
this point I'm still running the Generic kernel. I say stupidly
because the target system is really going to run an i386-RELEASE of
5.x or 6.x. Later I repented, after gvinum frustration, re-sliced
and moved my original install onto slice 2.
For disk I have to PATA drives that I have been using for some time
and 3 Samsung SATA drives. All but one of the drives is attached to
the MB controller. I have an addon "Buffalo" SATA/PATA card (also
~cheap) with a VT6421L chipset in it.
I'll comment that one of the SATA connections on the addon board does
not seem to function correctly with the amd release. I have not
tested it yet with my i386 RC-1 yet. HOWEVER I did run some default
iozone tests on all the working SATA and PATA drives so I'm fairly
confident that this the working SATA connection really works OK.
I also have a SATA "backplane". These are called various things but
the basic idea is to put three 3.5" drives in two 5.25" HH external
slots. This one has "hot swap" capability (dubious IMHO). For me
this is a convenient mechanical place to put disks. Again I'm
confident that this is OK since I ran the iozone tests with the
drives in this enclosure.
What I am trying to do:
What I'm studying is how to put together a "software" raid5 volume
and generally I like what I was reading about vinum as a flexible
tool to manage space. I'm not terribly concerned with IO performance
since I'm still calibrated to 5MB/s sustained throughput and keep
wondering why 2kb of code keeps getting repacked into 35MB's of
bloat. (see "grumble") above :-).
TIA
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