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Category Archives: Unix and Linux

Linux/Unix based computers, including NAS servers, VPN servers, cron-running machines, and desktop workstations.

Making duplicity and ncftpput play nice with vsftpd FTP daemon


I’ve been setting up yet another remote backup lately (see associated problem here). For this purpose (on Unix), the duplicity solution looks ideal. However, I’ve tried it on a couple of lightweight FTP servers (a TL-WDR3600 and a Raspberry Pi) and neither of them work. I keep getting a “Permission Denied” message. I did quite […]

Keeping FreeBSD TCP performance in the midst of a highly-buffered connection


I was perplexed recently, when I began an rsync job to a raspberry pi server. I know exactly what limits the bandwidth of this connection–it is the CPU (or network) on the Raspberry Pi, which cannot accept data fast enough. So, even though my server is on a 1 Gbit/s interface, and the Raspberry Pi […]

worrbase – CrashPlan on FreeBSD 9.0, A HOWTO


I’m blogging this as a reminder to myself on what to do. I found it years ago, but that link doesn’t seem to exist anymore. Anyway, this is a good write-up on FreeBSD 9.0: worrbase – CrashPlan on FreeBSD 9.0, A HOWTO. The only difference betwen this and what I did was that I use […]

NFSv4 ACL history


Good summary of NFSv4 ACL’s (and their history): Implementing Native NFSv4 ACLs in Linux (by Greg Banks at SGI). Be the first to like. Like Unlike

Crucial m500 120GB as a ZFS slog


I re-did my benchmarks of my ZFS ZIL using a Crucial m500. The main reason I got this drive is that it has power-loss protection. And, it’s speeds are adequate to keep up with my gigabit Ethernet samba server. Here are the results. My first run was decent, but not stellar:

I didn’t do […]

Crucial m500 120GB benchmarks


The latest in my obsession with SSD’s. I jumped on a $70 deal at NewEgg. I bought it to use as a SLOG (ZIL) in my ZFS server, because of its write speeds and because of its power loss protection. I immediately updated the MU03 firmware to MU05. This may be with a SATA II […]

More ZIL/SLOG comparisons


Suspicious of my previous tests using iozone, I wrote a small program (that follows) to measure synchronous write speed. I tested this with and without an SLOG device, and then used a really fast Plextor M5 Pro 256GB SSD as the SLOG. I wanted to make sure that something could achieve the fast SLOG speed […]

SLOG tests on a 32GB Kingston SSD with iozone


This is a follow-up on my previous post. I ran iozone both with and without the [ccie]-e[/ccie] flag. This flag includes a sync/flush in the speed calculations. This flush should tell ZFS to commit the in-process data to disk, thus flushing it to the SLOG device (or to the on-disk ZIL). I ran 4 tests: […]

ZFS slog (ZIL) considerations


Running List of Alternatives 2015-08-11 It looks from this Anandtech article that the m550 does not have as strong power-loss protection as I originally thought. It protects the “lower pages” (least-significant bits) from corruption between page writes. But, it does not protect the DRAM buffer from losing data. 2014-07-07 The Transcend MTS600 line is capable […]

Kingston SV100S2/32 and SV100S2/64 benchmarks


Update 2014-04-06: Tests on the 64GB with a $10 Sabrent USB 3.0 Enclosure Added to the end The 64GB SSD has been my solid-state workhorse in my ZFS pool for a while. First, it was the L2ARC, then it was the ZIL. In fact, I used to have two, but I broke the connector off […]