Brad Fitzpatrick (brad) wrote,
Brad Fitzpatrick
brad

a story about raid

So just last night I posted about my new server / RAID array, right?

Tonight I'm copying over the contents of the old server's 100GB RAID to the new RAID.

During the first file being copied over (a big .tar.gz from /raid/backups/, first directory alphabetically), my desktop freezes (which netboots off my old server) and I hear louding clicking noises from the other room.

My old server's IDE bus was:

hda (primary master): 40 GB boot
hdb (primary slave): 100 GB, raid 1
hdc (secondary master): cd-rom
hdd (secondary slave): 100 GB, raid 1

Anyway, hdb was the clicky one. And it took out the primary channel, rendering the machine very pathetic (and my desktop frozen) until I unplugged the disk from hdb. At that point, hda came back alive, and the RAID-1 realized hdb was gone and gave all traffic to hdd.

My rsync from sammy kept on going, and my desktop came back alive.

Morals of this story:

-- disks die
-- funny timing
-- PATA w/ shared channels suck. go SATA!

Heh, just got email:
From: mdadm monitoring <root@xxSNIPPEDxx.danga.com>
To: brad@danga.com
Subject: DegradedArray event on /dev/md0:tally

This is an automatically generated mail message from mdadm
running on tally

A DegradedArray event had been detected on md device /dev/md0.

Faithfully yours, etc.
Oh, and mdadm is cool.

Oh, and 100Mbps ethernet is fucking slow.
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