So after looking around this morning for a simple file system script to alert me when my ZFS pools have problems on my new file server I found a few, the problem was none worked correctly. Strangely these scripts were … Continue reading
So after some messing around I discovered that with Cyanogenmod CM11 (KitKat) release that USB Mass Storage mode wasn’t working, so after some messing around here is what I’ve found. If you’re like me, you enabled developer mode: Go to … Continue reading
Originally taken from: http://www.datadisk.co.uk/html_docs/redhat/rh_lvm.htm Logical Volume Manager (LVM) This is a quick and dirty cheat sheet on LVM using Linux, I have highlighted many of the common attributes for each command however this is not an extensive list, make sure you … Continue reading
As a general rule of thumb external journaling on ext4 / ldiskfs type file systems can and will greatly improve overall write performance. This is due to the fact that you’re off loading small (4K) writes to an external disk … Continue reading
What is Lustre DNE? The Lustre Distributed Namespace (DNE) feature is a new technology developed for the Lustre File system. The feature it self allows for the distribution of file and directory metadata across multiple Lustre Metadata Targets (MDT). With … Continue reading
When installing lustre it is necessary to generate the storage targets, this is completed with mkfs.lustre, normally this happens without issue, however from time to time this isn’t the case. The following issues are ones I’ve seen and solutions are … Continue reading
From the Wikipedia article on Lustre File Systems: Lustre is a type of parallel distributed file system, generally used for large-scale cluster computing. The name Lustre is a portmanteau word derived from Linux and cluster.[3] Lustre file system software is available under the GNU General Public License (version 2 only) and … Continue reading
Just a reminder, if you’ve got an SSD and any modern Linux distribution fstrim is your friend. I suggest running it as a simple cron job.
In Lustre 2 and above, the inode numbers, which on a standard file system represent the static integer ID of a file now appear to be totally insane, being full 64bit integers. [root@coolermaster lustre]# stat x y z File: `x’ … Continue reading
As requested, here is a Lustre 2.4.0 /proc/fs/lustre dump containing various bits of information on my simple single node test system Click here to view