Switching ext4 to btrfs on a VPS with no CD-ROM

The default filesystem on my VPS was ext4 and I wanted to use btrfs. However, the CD-ROM options were disabled so there was no simple way to boot a rescue CD and do the conversion. Happily, it was possible without opening a ticket to use GRUB to boot an ISO image. This will require console […]

December 10, 2015 · agw · No Comments
Tags: , , ,  · Posted in: Debian, Linux, Technical

kos-mos is dead, meet t-elos

The old file server was a beast. 2 2.4GHz dual-core Opterons, the old 90nm chips. 5GB (don’t ask) of RAM. And…2.7TB of storage, with a big pile of 250GB and 500GB drives mashed together into several arrays that were dumped into a volume group. The whole thing was encrypted just for kicks. There was also […]

March 7, 2011 · agw · No Comments
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ISA is not fast

Using a pair of ISA IDE controllers for a mirror, and an ISA NIC is a recipe for sloooooow. md2 : active raid1 sda3[2] sdb3[1] 425600 blocks [2/1] [_U] [====>…………….] recovery = 24.3% (104064/425600) finish=10.5min speed=508K/sec Oh yeah.

March 30, 2010 · agw · No Comments
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kos-mos is healthy again

With the receipt of a replacement drive that took about a year for me to send back for warranty repair, all the RAIDs in kos-mos are rebuilt and happy now. Seagate sent a 400GB model to replace the 250GB I sent out. Doesn’t gain me anything really since I don’t have any other 400GB drives. […]

August 7, 2009 · agw · No Comments
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HPT-366 finale: giving up.

Yeah, I’m a quitter. After having some more interrupt issues with the HPT-366 IDE controller in the old file server, this morning I decided to make another effort to get to the bottom of it. The issues I was having seemed to coincide with the tulip ethernet driver reporting various problems. First on the list, […]

July 5, 2009 · agw · No Comments
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Automatic notification of Debian package updates via cron

Very simple, and hinted at in the Debian APT HOWTO. I think I used to use a different package for this, but I think I like the simplicity of this method better. After installing apt-show-versions, I made the following entry in root’s crontab: @daily apt-get -q -q update 2> /dev/null && apt-show-versions -u root gets […]

June 20, 2009 · agw · 4 Comments
Tags: , , ,  · Posted in: Debian, Technical

HPT-366, breakage workaround

Looks like I have been able to get around the issues with the HPT-366 chipset. I have a filesystem reorg (xfs_fsr) going on with the system, heavy drive activity, and no timeouts or bus resets. The solution was to turn everything on, including DMA and write cache, but explicitly disabling interrupt unmask. Now with all […]

May 24, 2009 · agw · No Comments
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It’s back!

After much delay, I finally got my ass in gear and rebuilt my dual-head Linux setup. For months now I’ve been using my XP64 “game machine” as my primary machine for everything – gaming, work, internet, etc. Before I moved I used my Linux workstation for virtually everything except gaming. It’s been a while but […]

April 28, 2009 · agw · No Comments
Tags: , ,  · Posted in: Linux