Boot from Raid

[Jeff Tarnok]

------ =_NextPart_000_01BC80A2.FDBB9E80
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit

Thanks for the information.
----------
From: 	leavitt@webcom.com[SMTP:leavitt@webcom.com]
Reply To: 	ssa-managers@Eng.Auburn.EDU
Sent: 	Tuesday, June 24, 1997 11:03 AM
To: 	ssa-managers@Eng.Auburn.EDU
Subject: 	Re: Boot from Raid

> 
> We have an 18 disk SSA110 Sun Array connected to a 4000 running Solaris =
> 2.51. We would like to boot the 4000 from the raid and mirror the root =
> volume. Is there any danger to booting booting from the array? Is there =
> any documentation that can help expedite the process?  Thanks
> 

This is supported, but generally not recommended (informally), according
to nearly ever Sun engineer I've spoken to (the people who get to fix
things when they break). Basically, it adds a very significant layer
of complexity to the booting process, relatively little protection,
and vastly increases the complexity of upgrades of both the volume
manager and the OS, as well as decreasing the "portability" of the
data on the storage array.

The recommended method of disaster recovered is "high-availability"...
dd your root disk to an equivalent internal disk on a nightly basis.

When your primary disk dies, or someone pulls a bonehead manuever
like rm -r /bin, or a patch upgrade or backout goes bad, instead of
having to recover from tape, or reconstruct everything, you do
a "break", go down to the "ok" prompt, and type "boot disk1" 
(or equivalent), and you're back up. Further, apparently, if your
primary disk goes bad, and your system crashes, it will try and
boot off the bad disk, and failing that, fall back to the secondary
disk ("disk1"). Not sure how to set this up, or whether it is
automatic.

Regards,
Thomas Leavitt


-- 
WebCom (sm)                        Thomas Leavitt--leavitt@webcom.com
Voice: (408) 457-9671 x101         Executive Vice President
 
WebCom Home Page <URL:http://www.webcom.com/>



------ =_NextPart_000_01BC80A2.FDBB9E80
Content-Type: application/ms-tnef
Content-Transfer-Encoding: base64

eJ8+IjoRAQaQCAAEAAAAAAABAAEAAQeQBgAIAAAA5AQAAAAAAADoAAEIgAcAGAAAAElQTS5NaWNy
b3NvZnQgTWFpbC5Ob3RlADEIAQ2ABAACAAAAAgACAAEEkAYATAEAAAEAAAANAAAAAwAAMAIAAAAL
AA8OAAAAAAIB/w8BAAAAVQAAAAAAAACBKx+kvqMQGZ1uAN0BD1QCAAAAAHNzYS1tYW5hZ2Vyc0BF
bmcuQXVidXJuLkVEVQBTTVRQAHNzYS1tYW5hZ2Vyc0BFbmcuQXVidXJuLkVEVQAAAAAeAAIwAQAA
AAUAAABTTVRQAAAAAB4AAzABAAAAHAAAAHNzYS1tYW5hZ2Vyc0BFbmcuQXVidXJuLkVEVQADABUM
AQAAAAMA/g8GAAAAHgABMAEAAAAeAAAAJ3NzYS1tYW5hZ2Vyc0BFbmcuQXVidXJuLkVEVScAAAAC
AQswAQAAACEAAABTTVRQOlNTQS1NQU5BR0VSU0BFTkcuQVVCVVJOLkVEVQAAAAADAAA5AAAAAAsA
QDoBAAAAAwBxOgAAAAACAfYPAQAAAAQAAAAAAAACSD8BBIABABMAAABSRTogQm9vdCBmcm9tIFJh
aWQA+QUBBYADAA4AAADNBwYAGAANAB8AOQACAFkBASCAAwAOAAAAzQcGABgADQAeACYAAgBFAQEJ
gAEAIQAAADBCMUI5NDM4OTlFQ0QwMTFBMzZCMDA2MDk3RDJDRTI5ABgHAQOQBgDoBwAAFAAAAAsA
IwAAAAAAAwAmAAAAAAALACkAAAAAAAMALgAAAAAAAwA2AAAAAABAADkAYAHlg8SAvAEeAHAAAQAA
ABMAAABSRTogQm9vdCBmcm9tIFJhaWQAAAIBcQABAAAAFgAAAAG8gMSD4ziUGwzsmRHQo2sAYJfS
zikAAB4AHgwBAAAAAwAAAE1TAAAeAB8MAQAAABYAAABXaW5kb3dzL0FETUlOL3Rhcm5va2oAAAAD
AAYQJYO9RgMABxDFBQAAHgAIEAEAAABlAAAAVEhBTktTRk9SVEhFSU5GT1JNQVRJT04tLS0tLS0t
LS0tRlJPTTpMRUFWSVRUQFdFQkNPTUNPTVNNVFA6TEVBVklUVEBXRUJDT01DT01SRVBMWVRPOlNT
QS1NQU5BR0VSU0BFTgAAAAACAQkQAQAAAGMGAABfBgAADAsAAExaRnW2eKI/AwAKAHJjcGcxMjX+
MgD/AgYCpAPkBesCgwBQEwNUAgBjaArAc2V0/jIGAAbDAoMOUALzBxMCgG59CoAIzwnZOxVvDjA1
LwKACoEOcQtgbg4QMDMIM1xoBbB6ZG9jtQAAKhJVIAKRGXBsGaWXCvsTsQvyYwBAIFQSgBxuawQg
AhAFwHRoZU4gC4AcwQDAdGkCIC5BCotsaTE4MALRafAtMTQ0DrAM0B9zC1m3HvAKoANgdAWQBUAt
IZevCocgSwwwIRZGA2E6Ip4DIRYMgiBsZWF2aSECQEB3ZWIFoG0ugScBW1NNVFA6Jl9MbV0iPyNN
UmULUHmdHEBvJH8liwQQYS0DgURhZwSQc0BFGHAuGEF1YghwHeBFRFW/KQ8jTQZgAjArjyWLVApQ
AHNkYXksIEp1Em4dIDI0M6AxOTmyNzRAMToYoBQQTS8f/yNNK28sfy2PLp81vzC1OkA+aiFRN08l
iysAPUBCb98hMBywA2EH8AtwZAqFHg3cMzYgFxulIRY+QKZDQHZXHSASgHYdIAORHvAgSmQEAGsG
AFNBNKAwVzzBA6AHEHIzgCAFoG6vM+AhYAmAHPBvRGAgH5D5HxAgcjPQAwAYcAYABvATCsAEACA9
Q2cyLjXUMS5D4ncIYGxGsB7Q/msdIEbRBuA/gR0CRyM/s58dAkXwQCBEYUawbWlF4K8c1QNgP4FI
eHYG8HUHgP1JUEkEIB0BFXBEYStAM3D/GHAEkEpGR7JQFktnCsBF8f4/TphIeE8zGTBOUQIwHaMf
HPEdoEYgA5EdEGxwIPhleHAJgCaQSjEdESER+mMHkHNR8BxFQ2dATBxQw0hBSEFzdXBwFREJgL8z
oDpQBUA5oDPgRfBsKzF+bj+BFXAnAVPBDnBGsCj7HUVaUSkzoADQBaFE0Bhw3wqFRtEz4ArAKzFl
REAFwDtFkgnwZwuACeAFwEknvURBc1kwSiBUQUbgKFXT/GVvC1BJgRjgWeFKsUbg/R9AeF0GWJAY
cAQgYOBfwosdECtAYhVwYWspSVB8QmEN0VpCM6AmkERgZL5kBCBHAF4hK0AAkGcDAG8fQFSxBUAL
YHkEkAqFb+pmRiFtYKF4JpArQEbR/x0CUBZWFTOgFXALYB2wREC/KzEe0AJAYLEhFR3BLAqF/UxC
dmPQaiArQAuABQAn4P8SsE6zZwpm4VkQCcBkoAeR/2bhBuAdABzzTiQKhTllTDP5HQJPU1xRYoFV
AAMgcVHvBYFsYkeyHQIiWTIBoAMQ/WeBImbSHQEKhTNwAZBm0P9i0zkQRtBF8DmgUZQd9lgX/0vR
WukHgB0ABHBm0kTRa9FfT7Fa0l4hRqFIQSJYkGe8aC0mcAtwC2BzVS57UPt0NkaweQhhTSRE00bS
XoH8cXVpkAdAMSEdMXkROYB/AyBE01QxRwADAHpQa/Ji9WPRc3Y9V2KyfCMhEAdwfwrAT1FE4kTQ
B5AzoAWxc9cDcGCAM+FwScBsZNIG4P8z4B0QZKBwAgpQXiEKhUoD9x2AIYAFwC9zUGrwgtJHAD0K
sHQScG3mgtJ/0GNr+whgWdFvB5F/0FmBC4B5Af+EcWbgCoVEIXJzRuB5VUtV/mFVYILDWtKJMUdw
IWFeEv55YjMzoHwhU3FrFnLgY0PuIjOgiIBTcXdf03KzX6C3c7AhEWcwdFxRcKJ5VWDbjpF8hjFz
sAqFKAWxfXj3XEJMUXwhJ08BiAJt4UlQ/kYIcE7SXFFZIArAMSFkM39m8HwiCoWBu4iIk9WC8Xn/
eQE/4AUAY9AdEGkRZHED8P9xoYyQK0BMQQqFSoNm4HPj94jCRMOQ1GZ6oXJ0HaAzoP+dUHGhlINn
xRKwRjEzcGUws3Q2ROIoIpHkY5FOP4H/WQBPARjgB+BG0RKxYiIEIP9ZEILDYqFO0mRiBABrFlnA
2wNxHbBjdj0rAGcLEWkQ91gXA3EEIEwn5EBMCoUhkA+AlybgCFA/4ChzbSm/VpCqj6rjpvwhkCff
bQqFrFZvDeA/MSgfkDiqYIA0NTctOTY3HDDNH9AwHDCq5kV4BZBZwOdpka5wrqEgUBVwAJAOcHcC
MAqFqU1IgyGxkHWiPPBVUkw6Gy8AUEnAIQYPGkAcgEawf4B0cDov1C93tyAuJtgvQd9C5b+n30Dv
uD8hUgqFFJEAvbAAAwAQEAAAAAADABEQAQAAAEAABzBQoc9UxIC8AUAACDBQoc9UxIC8AR4APQAB
AAAABQAAAFJFOiAAAAAAAwANNP03AABPlg==

------ =_NextPart_000_01BC80A2.FDBB9E80--