On 06/04/2012 08:34 AM, Gary Aitken wrote:
On 06/03/12 20:59, Kaya Saman wrote:
this is a very strange issue but I guess will either be related to 2
things, PSU not being powerful enough or disk controller simply being crap.
Here's what's going on. I have a little Chenbro 4 disk mini-ITX NAS
server with 2x 2TB disks and 2x4TB disks as storage - all spread out
over 2 ZFS storage pools. Additionally I am running the root file system
on a 40GB SSD.
[...]
_______
One thing I can think of is to disconnect the questionable disk from the RAID
controller card and connect it directly to the motherboard.
Then you'd know whether the fault is with the hard drive or the RAID controller.
PSU = power supply unit? 180 watts seems very little, I didn't know any modern
system could run on so little. I thought the minimum would be around 400 watts,
and this would not allow for a powerful gaming graphics card.
Maybe you need to replace the power supply with something having more watts,
but make sure it will physically fit.
Tom
Thanks for the response!
Here's some more info that I managed to dig up:
Jun 4 02:39:19 Zeta-Ray root: ZFS: vdev I/O failure, zpool=ZFS_POOL_2
path=/dev/ad4 offset=270336 size=8192 error=6
Jun 4 02:39:19 Zeta-Ray kernel: ata2: port is not ready (timeout 15000ms) tfd =
000000ff
Jun 4 02:39:19 Zeta-Ray kernel: ata2: hardware reset timeout
Jun 4 02:39:19 Zeta-Ray kernel: unknown: TIMEOUT - WRITE_DMA48 retrying (1
retry left) LBA=269091394
Yeah, 180 Watts is what comes with the chassis as it's an external power
supply. Additionally the system is a Mini-ITX so that would account for less
power usage however, in this case I think it might be the PSU that's simply not
providing enough power.....
I will definitely try sticking the "downed" disk into the motherboard
controller directly as that will tell me if the disk is the issue or not.
If the problem is actually insufficient power, this won't tell you a thing.
You'll have to isolate the power supply as not being a problem before anything
else will be relevant.
If you swap the two new disks, and the one now on the card fails, it's probably
not a disk problem. But you still can't tell if its the card or insufficient
power.
If you can sideline the two original disks and run, it's probably power. But
I'd guess you're oversubscribed in that department. It should be relatively
easy to estimate as mfg specs for cpu + mobo + disks is readily available.
Gary
More digging yields this:
zpool iostat -v
---------- ----- ----- ----- ----- ----- -----
ZFS_POOL_2 527G 6.74T 0 0 3.18K 1.39K
ad4 431G 3.20T 0 0 1.55K 678
ad14 95.6G 3.53T 0 0 1.63K 740
---------- ----- ----- ----- ----- ----- -----
There is not much bandwidth being used..... the disk is fine!
The bandwidth gets a little more and the disk starts timing out:
---------- ----- ----- ----- ----- ----- -----
ZFS_POOL_2 527G 6.74T 0 0 19.0K 12.8K
ad4 431G 3.20T 0 0 17.3K 5.97K
ad14 95.6G 3.53T 0 0 1.72K 6.81K
---------- ----- ----- ----- ----- ----- -----
I'm pretty sure it's the Strartech.com controller in the system!!
Regards,
Kaya
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