Date: Fri, 4 Apr 2003 18:21:50 -0500 From: "Michael G. Jung" <mikej@confluenttech.com> To: <freebsd-fs@freebsd.org> Subject: 5.0 Raidframe / SMP / Questions Message-ID: <9D7F0DF3FB16D41184010050DA90E000BF6631@neo.confluentasp.local>
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First I'm new to raidframe... but I have a few questions/problems - =
thanks to all
in advance...
--mikej
Michael Jung
The scenario - I have 20xFastWide 18.2 disks - would like to mirror two =
for boot=20
2 hot spare and use 16 raid 5(4?).... I'm looking for drive space and =
not necessarily=20
raw speed.
I'm testing with:=20
FreeBSD dual-450.mikej.com 5.0-RELEASE FreeBSD 5.0-RELEASE #0: Thu Jan =
16 22:16:53 GMT 2003 =
root@hollin.btc.adaptec.com:/usr/obj/usr/src/sys/GENERIC i386
0) I've been reading the netbsd list and it seems problems exist with =
smp... is that=20
the case with FreeBSD ????
1) "man raidcontrol" indicates that you need to set the disklabel to =
"RAID" if you want
the kernel to boot from the partition but disklabel stubbornly =
insists that "RAID" is not a valid
type... I get this error when trying to do so with disklabel......
"line 23: Warning, unknown file system type RAID"
and it kindly marks the partion type to "unknown"
2) Does RAID 4 work????? for write performance would this not be a =
better option?
3) I have two drives in the chain that I get "unknown IOCTL" when they =
are in my raid
config... yet they are labeled exactly like the rest..... this is =
when running raidctl -C myconfigfile
(yeah da3s1e and da9s1e are the culprits)
Here is the config file (note they are commented out.. and the drive =
count is 8 active drives)
START array
# numRow numCol numSpare
1 8 0
START disks
/dev/da0s1e
/dev/da1s1e
/dev/da2s1e
#/dev/da3s1e
/dev/da4s1e
/dev/da5s1e
/dev/da6s1e
/dev/da7s1e
/dev/da8s1e
START spare
#/dev/da9s1e
START layout
# sectPerSU SUsPerParityUnit SUsPerReconUnit RAID_level_5
32 1 1 5
START queue
fifo 100
++++++++++++++++++++
Here is a sample disklabel of a drive that complains about IOCTL
++++++++++++++++++++
# /dev/da3s1c:
type: SCSI
disk: da3s1
label:=20
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 255
sectors/cylinder: 16065
cylinders: 2213
sectors/unit: 35566480
rpm: 3600
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0 # milliseconds
track-to-track seek: 0 # milliseconds
drivedata: 0=20
8 partitions:
# size offset fstype [fsize bsize bps/cpg]
c: 35566480 0 unused 0 0 # (Cyl. 0 - =
2213*)
e: 35551782 0 4.2BSD 0 0 0 # (Cyl. 0 - =
2212*)
(root@dual-450) /etc#=20
++++++++++++++++++++++
Here is a drive that works in my config file
++++++++++++++++++++++
(root@dual-450) /etc# disklabel da1s1
# /dev/da1s1c:
type: SCSI
disk: da1s1
label:=20
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 255
sectors/cylinder: 16065
cylinders: 2213
sectors/unit: 35566480
rpm: 3600
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0 # milliseconds
track-to-track seek: 0 # milliseconds
drivedata: 0=20
8 partitions:
# size offset fstype [fsize bsize bps/cpg]
c: 35566480 0 unused 0 0 # (Cyl. 0 - =
2213*)
e: 35551782 0 4.2BSD 0 0 0 # (Cyl. 0 - =
2212*)
(root@dual-450) /etc#=20
NOTE: da0 has the lowest sector count of 35551782... so I've set all e: =
slices to this value
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