Table of Contents Zpool Administration Install ZFS on Debian GNU/Linux VDEVs RAIDZ The ZFS Intent Log (ZIL) The Adjustable Replacement Cache (ARC) Exporting and Importing Storage Pools Scrub and Resilver Getting and Setting Properties Best Practices and Caveats ZFS Administration Copy-on-write Creating Filesystems Compression and Deduplication Snapshots and Clones Sending and Receiving Filesystems ZVOLs iSCSI, [...]
Table of Contents Zpool Administration Install ZFS on Debian GNU/Linux VDEVs RAIDZ The ZFS Intent Log (ZIL) The Adjustable Replacement Cache (ARC) Exporting and Importing Storage Pools Scrub and Resilver Getting and Setting Properties Best Practices and Caveats ZFS Administration Copy-on-write Creating Filesystems Compression and Deduplication Snapshots and Clones Sending and Receiving Filesystems ZVOLs iSCSI, [...]
Table of Contents Zpool Administration Install ZFS on Debian GNU/Linux VDEVs RAIDZ The ZFS Intent Log (ZIL) The Adjustable Replacement Cache (ARC) Exporting and Importing Storage Pools Scrub and Resilver Getting and Setting Properties Best Practices and Caveats ZFS Administration Copy-on-write Creating Filesystems Compression and Deduplication Snapshots and Clones Sending and Receiving Filesystems ZVOLs iSCSI, [...]
Table of Contents Zpool Administration Install ZFS on Debian GNU/Linux VDEVs RAIDZ The ZFS Intent Log (ZIL) The Adjustable Replacement Cache (ARC) Exporting and Importing Storage Pools Scrub and Resilver Getting and Setting Properties Best Practices and Caveats ZFS Administration Copy-on-write Creating Filesystems Compression and Deduplication Snapshots and Clones Sending and Receiving Filesystems ZVOLs iSCSI, [...]
Table of Contents Zpool Administration Install ZFS on Debian GNU/Linux VDEVs RAIDZ The ZFS Intent Log (ZIL) The Adjustable Replacement Cache (ARC) Exporting and Importing Storage Pools Scrub and Resilver Getting and Setting Properties Best Practices and Caveats ZFS Administration Copy-on-write Creating Filesystems Compression and Deduplication Snapshots and Clones Sending and Receiving Filesystems ZVOLs iSCSI, [...]
I just setup an SSD ZFS Intent Log, and the performance improvements have been massive. So much so, I need to blog about it. But first, I need to give you some background. I’m running a 2-node KVM hypervisor cluster replicating the VM images over GlusterFS (eventually over RDMA on a DDR InfiniBand link). One [...]
I’ve been in the UNIX and GNU/Linux world since 1999. Back then, hard drives were barely passing double digits in GB, and RAM was PC100 speed at roughly 128 MB max. In fact, it wasn’t uncommon for most systems to have 32 MB of RAM with an 8 GB hard drive. And we ran GNOME, [...]
Per my last post, I decided to setup an entropy server that the community could use. So, I’ve done just that. That server uses 5 entropy keys from Simtec Electronics in the U.K. as its hardware true random number generators. It hands out high quality randomness for the most critical cryptographic applications. The purpose, is [...]
With my last post about the entropy key hardware true random number generator (TRNG), I was curious if I could set this up as a server. Basically, bind to a port that spits out true random bits over the internet, and allow clients to connect to it to fill their own entropy pools. One of [...]
I noticed that on my machine, my entropy was staying high, then falling off. Then, at what appeared to be some arbitrary point, it would fill back up, in a very periodic manner. This is, of course, after running haveged in the background. Curious, I started looking into it. It took a while to find. [...]
I admit that my last post sucked. I’ve been working on a few things that I want to blog about, but it’s going to take time to get all my ducks in a row. So, that post was mostly “filler”. Read as “I haven’t blogged in a while, and should probably put something up”. Sorry. [...]
This is just a quick post about getting a fully kernel-space encrypted ZFS filesystem setup with GNU/Linux, while still keeping all the benefits of what ZFS offers. Rather than using dmcrypt and LUKS, which would bypass a lot of the features ZFS brings to the table, encryptfs is our ticket. The reason this is so [...]
There are times when “kill -9″ is the only time you can kill a PID that is behaving badly. However, it’s usually not needed if you know your signals. When I encounter a badly behaving program, here is the procedure I usually take. First, I’ll send a SIGTERM (kill -15) to the PID. Sometimes this [...]
So, we were just recently troubleshooting a connectivity issue at the office. Some things seemed slow, other things seemed fast. It was hard putting a finger on it. So, we starting pinging random stuff, trying to figure out exactly what was going on. Is it routing? Is in DNS? Is it layer 2? What gives? [...]
I recently built two servers that I plan on using for a sandbox with various technologies (Infiniband, ZFS, RDMA, GlusterFS, Btrfs, Ceph, LXC, KVM, etc, etc, etc). So, getting everything installed and running, I ran into a rather interesting bug. I installed KVM and libvirt, and started rolling out some virtual machines. I wanted to [...]
