Re: SPARC STORAGE ARRAY and RAID 5
From: Dennis Clarke (dclarke_at_blastwave.org)
Date: 04/28/03
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Date: Mon, 28 Apr 2003 02:49:10 -0400
On Sun, 27 Apr 2003, Solaris Boy wrote:
>Hi..
hello
>I have some Q's regarding the SPARC STORAGE ARRAY.
ok .. shoot
>I looked up sun.com
>and they dont have any info on this( Unless I am extremely bad at
>browsing websites). All that I see on the storage part is SUN STOR
>EDGE. Is this(SPARC STORAGE ARRAY) an antique now?
yes. It is EOL for a long time now.
>Can I still
>use this to install solaris 9.
no problem.
>Also We would like to do RAID5 on this.
Really really _bad_ idea. If you want world class slow performance then
you can do RAID5 via SVM but ... don't do that to yourself. Just don't.
>Is this possible on this storage array? Is it a good idea to have HD's
>manufactured by other vendors or go for HD's manufactured by SUN. I
>guess they come in 18GB and 36GB.
Well .. 18Gb disks are definately not supported on the SSA.
In fact, I don't think that you will get much more than a 4Gb Sun disk
in that SSA within the definitions of Sun specs. Outside of that you may
be able to simple put 9Gb disks in there also.
Be sure that you have ssaadm installed on the server.
Thus :
# uname -a
SunOS medusa 5.9 Generic_112233-04 sun4u sparc SUNW,Ultra-2
# cat /etc/release
Solaris 9 s9_58shwpl3 SPARC
Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
Use is subject to license terms.
Assembled 15 April 2002
Solaris 9 Maintenance Update 2 applied
# which ssaadm
/usr/sbin/ssaadm
# ssaadm -v display c1
- Getting state information from SPARCstorage Array
/devices/sbus@1f,0/SUNW,soc@1,0/SUNW,pln@a0000000,78c6ac:ctlr
- Verifying Controller is healthy
Controller is a:SUN SSA100
- Reading state of each drive
- Reading vendor's information and capacity from each drive
SPARCstorage Array 100 Configuration
(ssaadm version: 1.23 00/07/17)
Controller path:/devices/sbus@1f,0/SUNW,soc@1,0/SUNW,pln@a0000000,78c6ac:ctlr
DEVICE STATUS
TRAY 1 TRAY 2 TRAY 3
slot
1 Drive: 0,0 Drive: 2,0 Drive: 4,0
2 Drive: 0,1 Drive: 2,1 Drive: 4,1
3 Drive: 0,2 Drive: 2,2 Drive: 4,2
4 Drive: 0,3 Drive: 2,3 Drive: 4,3
5 Drive: 0,4 Drive: 2,4 Drive: 4,4
6 Drive: 1,0 Drive: 3,0 Drive: 5,0
7 Drive: 1,1 Drive: 3,1 Drive: 5,1
8 Drive: 1,2 Drive: 3,2 Drive: 5,2
9 Drive: 1,3 Drive: 3,3 Drive: 5,3
10 Drive: 1,4 Drive: 3,4 Drive: 5,4
CONTROLLER STATUS
Vendor: SUN
Product ID: SSA100
Product Rev: 1.0
Firmware Rev: 3.12
Serial Num: 00000078C6AC
Accumulate Performance Statistics: Disabled
Thus, I have thirty disks in the SSA with ten in each tray. Common sense
dictates that you can not simply create one large RAID5 stripe across all
thirty disks. Why? Well, in the event of a disk failure you will need to
take the entire array offline in order to spin down a tray and replace a
single disk. The best way to setup things is to simply stripe an entire
tray together and then mirror that with its neighbor tray. If you have all
three trays full then you can create a three-way mirror and do online backups
whenever you want by taking a tray offline. So long as you don't lose a disk
in each tray you're fine.
Be sure to read the man page of the ssaadm utility. You will need it.
The key thing to know is how to spin down a tray and replace a disk while
running.
Dennis
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