------------- Begin Forwarded Message -------------
Date: Tue, 8 Dec 1998 10:52:44 -0500 (EST)
From: "Matthew C. Aycock" <matt@mathcs.emory.edu>
Subject: SUMMARY: ODS on U10 with IDE drives
To: ssa-managers@sunmanagers.ececs.uc.edu
MIME-Version: 1.0
Content-MD5: SUbMrBlgfEOrdg/h7aL30Q==
Michael,
The followin is from the Solstice Disksuite 4.2 Installation manual
(see docs.sun.com if you need a copy of the installation manual).
It describes the supported configuration containing EIDE drives and
mirroring. I am currently mirroring 2 EIDE Master drives on our news
server and it is working fine, although I have never tried to pull the
plug on one of the drives.
Hope this helps,
Matthew
**********************************************************************
Supported configurations with EIDE Drives
Solstice DiskSuite 4.2 running on Solaris 7 (and DiskSuite 4.1 running on
Solaris 2.6) supports EIDE drives on
Darwin class SPARC machines, including Ultra 5, Ultra 10, and Ultra 30 and x86
machines that have EIDE
drives. Solstice DiskSuite sees no difference between EIDE and SCSI drives.
Solstice DiskSuite supports mirroring of EIDE drives only if they are on
different channels. The Darwin class
machines have two IDE channels, each with a master and a slave. The problem is
that if an error occurs on a
master drive, the slave drive for that channel will no longer respond to
requests. For that reason, you can
mirror only disks on different channels. This is a design issue for IDE drives
and not a bug introduced by Sun. If
you are running on Solaris 2.6, you can install patchID 106407-02 to prevent
this problem.
The following table shows the supported configurations and where mirroring is
supported on the Darwin class
SPARC machines that have EIDE drives.
Supported Configurations on Darwin Class Machines
Primary
Secondary
SCSI
Category
Master
Slave
Master
Slave
1
D1
None
None
None
D1 mirrored to SCSI
2
D1
CDROM
None
None
D1 mirrored to SCSI
3
D1
CDROM
D2
None
D1 mirrored to SCSI
4
D1
CDROM
D2
None
D2 mirrored to SCSI
5
D1
None
D2
None
D1 mirrored to SCSI
6
D1
None
D2
None
D2 mirrored to SCSI
7
D1
None
D2
None
D1 mirrored to D2
8
D1
None
D2
CDROM
D1 mirrored to SCSI
9
D1
D2
None
None
D1 & D2 mirrored to SCSI
10
D1
D2
CDROM
None
D1 & D2 mirrored to SCSI
11
D1
D2
D3
CDROM
D1 & D2 mirrored to SCSI
12
D1
None
D2
D3
D2 & D3 mirrored to SCSI
Some users want to create a server with higher availability by mirroring two
EIDE drives. In the previous
table, configuration 7 shows that this is possible. However, it is important to
realize that DiskSuite
recommends three disks for the location of three metadevice state databases.
These disks create a quorum that
guarantees continuous operation. If the first two disks are EIDE drives, the
third should be a SCSI drive.
Solstice DiskSuite supports mirroring of the internal boot drive, however
DiskSuite requires that three
metadevice state databases be created to ensure a quorum. That means you should
have three disks on the
system to ensure the safety of your data. It is possible to operate with only
two metadevice state databases, but
you are at risk if a disk fails.
**********************************************************************
------------- Begin Forwarded Message -------------
Date: Tue, 08 Dec 1998 09:40:40 -0500
From: Michael Pavlov <misha@cibc.com>
X-Accept-Language: ru
To: sun-managers@sunmanagers.ececs.uc.edu
Subject: SUMMARY: ODS on U10 with IDE drives
Content-Transfer-Encoding: 7bit
Original post:
> Have anyone tried that ?
> Will 0 + 1 make sense if master dies ?
> Or without the master IDE slave is dead too ?
> I also suspect it will be awfully slow.
I received few replies and did a quick testing myself.
Ronald and Rick brought to my attention that U10 has second IDE controller.
After I hooked up both drives as a master to separate connectors and pulled
secondary cable out - machine hang. Probably it's the
*same* "controller" but separate interfaces.
I sonclude that ODS in 0+1 mode on U10 with IDE drives won't give me any extra
redundancy.
Thnx to:
Salehi, Michael E
Mark Sherman
Rick Reineman
Ronald Loftin
--
_ _ _ Michael Pavlov
O /O /O /
_/\_/\_/\_/ CIBC Openheimer, New York
/ \/ \/ \ voice: (212)667-4420
_/ _/\_/\_ \_ alpha: (800)319-4525
------------- End Forwarded Message -------------
----------
Matthew C. Aycock
Operating Systems Analyst/Admin, Senior
Dept Math/CS
Emory University, Atlanta, GA
Internet: matt@mathcs.emory.edu
------------- End Forwarded Message -------------
----------
Matthew C. Aycock
Operating Systems Analyst/Admin, Senior
Dept Math/CS
Emory University, Atlanta, GA
Internet: matt@mathcs.emory.edu
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