pwm

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  1. This is an error with the disk file system. Replacing the original disk and rebuilding will just end up with a different disk containing a file system with the same errors. The message "Fsck?" at the end of the following line is a suggestion to try to use the file system check program to try to repair the file system: May 22 16:37:39 Media kernel: REISERFS error (device md2): vs-5150 search_by_key: invalid format found in block 885368410. Fsck? Another thing to note is that reiserfs isn't maintained anymore because the file system creator is spending his time in jail. So after you have repaired the file system, it might be a good idea to empty the disk by copying the files to another disk and then reformat the disk with a different file system type.
  2. pwm

    How do you define your shares

    Another reason for special media shares is that these shares are often used with media players - and the credentials used for the media players should have limited access since it's hard to know the actual security level of the media player. The media players just might have huge back doors that haven't been found yet.
  3. No, I don't think using consumer disks should be an issue. Just wondering if there might be some interaction with pin 3 of the SATA power connector - the signal in the SAS standard and in SATA v3.2+ and v3.3 intended to turn on/off power to the drive to force a full reboot of the drive. But I can't understand why connecting two SSD would make the backplane change behavior. And I can't see how 2xHDD + 2xSSD would draw so much current that something would break.
  4. Any component burned by supplying power to four disks?
  5. The parity can't repair broken file systems. The parity operates on disk level, and can be used to restore a disk image to the state it had at the last parity update. But if some software or hardware failure results in bad data being written to a data disk then the bad data will be mirrored to the parity disk so the system will restore the same broken file system. That's why parity isn't a replacement for backup - it's just a way to improve the availability. But file deletions or overwrites or raw disk writes will also update the parity - the parity logic can't separate intended file system changes from unintended. If you do not have any backup of the affected data, then you either need to check for recovery software that can scan the disk for file information that may be read out. Or you need to figure out if there exists any better software (or manual help) that can manage to repair more of the broken file system.
  6. Interesting file system - it looks like the start of the partition is completely zeroed for some reason. My guess is that the following is a printout of how many inodes the file system expects and how many it can actually find - a loss of 2250 entries: sb_icount 27328, counted 25088
  7. You should not just notify in the web browser. Configure and turn on email notifications or possibly make use of some suitable agent that can push to your phone. You want to get notifications from the system without first having to actively log in and look at the system - it's important that you can take quick actions if you get problems with a disk. If you have one parity drive, then unRAID can only recover from one broken disk. With two parity drives it can only recover from two broken disks. This means you don't want the system to run with emulated disks for any longer time.
  8. pwm

    Copying speeds

    Have you checked that the read and write counters in unRAID are static when you aren't copying? Just so you don't have any docker that might perform some unexpected accesses concurrently with your test.
  9. pwm

    X399 and Threadripper

    Lots of other equipment manages just fine with water cooling, so the concept as such has a quite good track record. It's just that water cooling solutions for PC equipment doesn't seem to be supplied with commercial grade pumps. People don't want to pay maybe $300 for just the pump. And that's probably the reasonable price for a pump designed for 20+ years of service life so the pump can manage a similar low failure rate as the other critical parts (processor, motherboard, PSU, RAM) of the system. And besides that, lots of water cooling solutions has toy-like connectors that doesn't age well. It doesn't help if the pump works well if the system leaks coolant. And where does any leaking coolant go? So in the end - if selecting between commercial-grade fans or semi-toy water cooling, it's important to remember that the standard water cooling systems really are not of the same quality. But they look great.
  10. Just a question - have you notifications enabled so you get mail with status information from your unRAID?
  11. pwm

    Support for more drives?

    It would be a bad idea - the best drives you can get specifies a 0.33% annual failure rate when they are new. So one drive failure every 6 years for such a big system. When the drives gets older then the annual failure rate will start to increase - which means the probability of multiple disk failures will start to be significant with such a big system. And disk failures aren't even the only danger when you build really big systems. There is a reason why big systems uses hierarchical designs to avoid that the failure probability starts to explode. The next thing is that it's a question of diminishing returns. When you have 5 data disks, you need to chip in 40% more to add 2 parity disks. When you have 25 data disks, you only need to add 8% for the 2 parity drives. So it isn't economically meaningful to double the number of drives just to keep down the cost of the parity drives - it's way better to instead use two independent arrays. Especially since two arrays allows better transfer rates and better availability and better ability to recover. The math isn't the same since the failure distribution is significantly different than the birthday distribution, but the birthday paradox is still an interesting concept about escalating probabilities: https://en.wikipedia.org/wiki/Birthday_problem
  12. pwm

    UR 6.5.2 one drive was off (Solved)

    Just remember that the name of the product is unRAID - it is not RAID. A traditional RAID array would stripe the data so individual files would be smeared over all the disks in the array. unRAID needs to fit each individual file on a specific disk - which also means you can play a movie from the array with just that specific data disk spinning.
  13. pwm

    CRC error count getting larger

    Gold-plated connectors normally uses (and requires) very little contact pressure. What you want is mechanical pressure on the connector shells to make sure vibration doesn't move the connector, resulting in wear on the contact points. Connectors that aren't using gold-plated surfaces are normally designed so there is a significant contact force - often because one part of the connector is intended to cut into the metal of the other surface to form a gas-tight connection to avoid oxidation. But this isn't required - or wanted - for gold-plated connectors. One problem with gold-plated connectors and low contact pressure is that in some designs, vibrations can allow dust to slowly move in and lift the spring and move in between the two surfaces.
  14. pwm

    CRC error count getting larger

    I normally did 45 degree bends to move them out of the way. Worked well with both IDE, floppy and SCSI cables. I never had a machine with air flow issues caused by any IDE cables. The only case I have had airflow issues with was my Chieftec Jumbo 15 because that case was designed to just cool disks and with almost zero air movements over the motherboard - a result of the case being designed for high-power SATA disks at a time when the CPU might consume max 15 W and there was no 3D graphics cards.
  15. The only way you can change file system is by moving your files somewhere else so you get an empty disk you can reformat. When unRAID rebuilds, it will do a binary block-by-block rebuild so it must always restore exactly the same file system as the original disk had. unRAID will not understand anything about file system structures - it just restores binary data in the way it was stored on the original disk.

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