“No data available” Error in GlusterFS Brick Log

Recently I was poring over my GlusterFS brick logs trying to troubleshoot a problem with self healing and I saw some (6,000+!) errors which alarmed me: [2013-11-22 09:21:51.138732] E [posix.c:2668:posix_getxattr] 0-homes-posix: getxattr failed on /mnt/gfs/wingu0/sda1/homes/yajamma/qdd_programs/qdd_files/qdd3_beta/MS_extract.pl: system.posix_acl_access (No data available) It turns out this error isn’t an error after all, and there’s a patch merged upstream […]

Disabling AES-NI on Linux OpenSSL

Ever since the Sandy Bridge microarchitecture, Intel CPUs have been coming with hardware-accelerated AES support (aka “AES-NI”, new instructions). I figured it would be interesting see a comparison between AES with and without the hardware acceleration on my Intel Core i5-3317U CPU (Ivy Bridge) on Arch Linux. According to a post on the OpenSSL Users […]

Remove all XFCE packages on Arch Linux

A few weeks ago, in a moment of weakness, I installed xfce4 and xfce4-goodies. I was having problems with GNOME 3.8 on my hipster Samsung Series 9 laptop, and decided maybe XFCE (4.10.1 as of this writing) was the answer. Nope. GTFO. I went back to GNOME and forgot the affair ever happened… until now, […]

Update GlusterFS 3.3.1 to 3.4.0 on CentOS 6.4 cluster

Notes from the GlusterFS 3.3.1 -> 3.4.0 upgrade on my storage / compute cluster at ILRI, Kenya. I referenced Vijay Bellur’s blog post about upgrading to 3.4, then added my own bits using Ansible for my infrastructure (I gave an overview of my Ansible setup here). Our cluster is comprised of: Three “storage” nodes (gluster […]