centos Archives - AWS Managed Services by Anchor

Large filesystem “support”

By | Technical | 2 Comments

I’ve written recently on how to handle systems with very large storage subsystems. One would think that as we make our way through 2009 that the supporting tools for such large filesystems are at the top of their game, but as I’ve been playing with 24TB of storage I’ve realised that this is hardly the case: The most commonly used bootloader for Linux systems, GRUB, doesn’t yet have capabilities to boot from GPT partitions (at least not in the stable release) The most commonly used partitioner, fdisk, doesn’t support GPT-partitioned disks (and hence no disk larger than 2TB) GNU parted, which does support GPT, insists on performing all partition resize operations itself (including resizing the contained filesystem). Since it doesn’t yet understand LVM, it can’t resize any partition that contains…

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Awesome Linux tool of the day: dstat

By | Technical | No Comments

What is dstat?  dstat is a versatile replacement for vmstat, iostat and ifstat. Dstat allows you to view all of your system resources instantly. Eg, You can compare disk usage in combination with interrupts from your HDD controller, or compare the network bandwidth numbers directly with the disk throughput (in the same interval). No blog post pimping a cool tool would be complete without the obligatory screen shot.

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