Date: Tue, 21 Jan 2003 16:44:44 +0100 From: Dag-Erling Smorgrav <des@ofug.org> To: fs@freebsd.org Subject: Re: RAID alternatives Message-ID: <xzpznpuwlqr.fsf@flood.ping.uio.no> In-Reply-To: <xzp4r82y1ol.fsf@flood.ping.uio.no> (Dag-Erling Smorgrav's message of "Tue, 21 Jan 2003 16:15:06 %2B0100") References: <xzp4r82y1ol.fsf@flood.ping.uio.no>
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Dag-Erling Smorgrav <des@ofug.org> writes:
> - RAIDframe: "should be considered highly experimental". Any
> experiences with this? Does it work? Is it fast? Is it
> reliable? I see it requires wiring down the drive IDs, which
> vinum doesn't IIRC.
Ho, hum, well, RAIDframe fails to impress me:
root@dsa ~# raidctl -c raid0.conf
Kernelized RAIDframe activated
Searching for raid components...
RAIDFRAME: protectedSectors is 64
Waiting for DAG engine to start
raid0: rebuilding: raidlookup on device: failed: 2!
raidlookup on device: failed!
raid0: rebuilding: raidlookup on device: failed: 2!
raidlookup on device: failed!
raid0: rebuilding: raidlookup on device: failed: 2!
raidlookup on device: failed!
raid0: rebuilding: raidlookup on device: failed: 2!
raidlookup on device: failed!
Error: block size on disks (0) must be a power of 2
RAIDFRAME: failed rf_ConfigureDisks with 22
fatal kernel trap:
trap entry = 0x2 (memory management fault)
faulting va = 0xdeadc0dedeadc0de
type = access violation
cause = load instructon
pc = 0xfffffc00004be3a4
ra = 0xfffffc00004703c4
sp = 0xfffffe000bda1a90
curthread = 0xfffffc000f79f170
pid = 635, comm = raid
Stopped at strlen+0x4: ldbu t0,0(a0) <0xdeadc0dedeadc0de> <t0=0xff
fffc00005e6ede,a0=0xdeadc0dedeadc0de>
db> trace
strlen() at strlen+0x4
kvprintf() at kvprintf+0x634
vsnprintf() at vsnprintf+0x40
panic() at panic+0xb4
_mtx_lock_flags() at _mtx_lock_flags+0x70
msleep() at msleep+0x6e0
DAGExecutionThread() at DAGExecutionThread+0x260
fork_exit() at fork_exit+0xf0
exception_return() at exception_return
--- root of call graph ---
(see attached configuration file)
DES
--
Dag-Erling Smorgrav - des@ofug.org
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Content-Disposition: attachment; filename=raid0.conf
#
# Experimental RAID5 configuration
#
# 1 row, 4 columns, 0 spares
START array
1 4 0
# 4 "disks"
START disks
/dev/da1d
/dev/da1e
/dev/da1f
/dev/da1g
# RAID level 5 with 32-sector interleave factor
START layout
32 1 1 5
# 100-deep FIFO queue
START queue
fifo 100
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