On Jun 16, 2010, at 9:02 AM, Carlos Varela <carlos.var...@cibc.ca>
wrote:
Does the machine respond to ping?
Yes
If there is a gui does the mouse pointer move?
There is no GUI (nexentastor)
Does the keyboard numlock key respond at all ?
Yes
I just find it very hard to believe that such a
situation could exist as I
have done some *abusive* tests on a SunFire X4100
with Sun 6120 fibre
arrays ( in HA config ) and I could not get it to
become a warm brick like
you describe.
How many processors does your machine have ?
Full data:
Motherboard: Asus m2n68-CM
Initial memory: 3 Gb DDR2 ECC
Actual memory: 8 GB DDR2 800
CPU: Athlon X2 5200
HD: 2 Seagate 1 WD (1,5 TB each)
Pools: 1 RAIDZ pool
datasets: 5 (ftp: 30 GB, varios: 170 GB, multimedia:
1,7TB, segur: 80 Gb prueba: 50 Mb)
ZFS ver: 22
The pool was created with EON-NAS 0.6 ... dedupe on,
Similar situation but with Opensolaris b133. Can ping machine but
its frozen about 24 hours. I was deleting 25GB of dedup data. If I
move 1-2 GB of data then the machine stops responding for 1 hour but
comes back after that. I have munin installed and the graphs stop
updating during that time and you can not use ssh. I agree that
memory seems to not be enough as I see a lot of 20kb reads before it
stops responding (reading DDT entries I guess). Maybe dedup has to
be redesigned for low memory machines (a batch process instead of
inline ?)
This is my home machine so I can wait but businesses would not be so
happy if the machine becomes so unresponsive that you can not access
your data.
The unresponsiveness that people report deleting large dedup zfs
objects is due to ARC memory pressure and long service times accessing
other zfs objects while it is busy resolving the deleted object's
dedup references.
Set a max size the ARC can grow to, saving room for system services,
get an SSD drive to act as an L2ARC, run a scrub first to prime the
L2ARC (actually probably better to run something targetting just those
datasets in question), then delete the dedup objects, smallest to
largest.
-Ross
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