The One Problem With My Racks & The NDS-4600-JD-05
My zero-U PDUs get covered up as my rack isn't super super deep.
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NDS-4600 - SATA Drive Failures In Linux
One issue I've recently run into with a failed SATA drive in one of my NDS-4600 units is that Linux frequently tries to recover the drive by resetting the bus. This takes out a few other disks in the group with it. The resulting IO timeouts cause problems for my Ceph OSDs using those disks.
It should be noted that only some types of disk failures cause this. The host bus resets only are done by the Linux kernel in some cases (I think) and I suspect the cause of the other disks errors is said disk.
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OSX Was Unix Once
Repeater Update | 449.375- 110.9hz | Changed Room
I've turned off the VA-Sterling room for now as I've got my node defaulting to the Virginia room with a few other nodes in the state.
Sterling, Va Wires-X Node & Repeater Is Up: 449.375- 110.9hz
The Sterling, VA, USA repeater and WIRES-X node is now up and operational.
It is a full duplex WIRES-X node, C4FM Repeater, and FM Repeater in FM19ha run by KG4TIH.
Scrubbing Vs Deep Scrubbing
Ceph has two forms of scrubbing that it runs periodically: Scrub and Deep Scrub
A Scrub is basically as fsck for replicated objects. It ensures that each object's replicas are all the latest version and exist.
A Deep Scrub is a full checksum validation of all data.
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Ceph For Media Storage (Big But Slow I/O)
My Ceph cluster at home isn't designed for performance. It's not designed to maximum availability. It's designed for a low cost per TiB while still maintaining usability and decent disk-level redundancy. Here is some recent tuning to help with performance and corruption prevention....
70cm Sterling Wires-X Node Online
Sterling, Va now has a Wires-X node (100% digital with full control) on 439.800MHz.
Note: If/when coordinated frequencies come in and the associated repeater is up, the frequencies will change.
23TiB On CephFS & Growing
Original post on Reddit
Hardware
Previously I posted about the used 60-bay DAS units I recently acquired and racked. Since then I've figured out the basics of using them and have them up and working.