Unix Imaging for Redundancy Post: 7424

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Top Forums UNIX for Advanced & Expert Users Unix Imaging for Redundancy Post 7424 by loadc on Wednesday 26th of September 2001 09:40:58 AM

09-26-2001

Registered User

Hmmm....

Well-

you tried my favorite already, "dd" is great, but how about a "dd" once a month, for a "Full image" mirror, and then using a *fsdump command to dump over the slices of the fs for the rest of the month? this is faster, but not as strenuous or inclusive as "dd". Is this a heavily used server 24/7? If not, the "dd" on a nightly or weekly basis should be fine. If the data is pretty static, like some static web pages with a separate database for info storage, then I'd say that a weekly "dd", and another whenever any major revisions are made would be good, but it really comes down to the state of your data. Since you are only looking at the mirror to maintain uptime, I am assuming this is some sort of webserver. If not, I'd look at getting something off to tape as well asap, you can never have too many backups to a removable media source. I'll also go with the hardline approach on this one, buy a good tape drive if you are using one, a good way to determine the value of your data is to see how much you put into your backup system. If you backup to a $10 DDS1 DAT drive, that must be all your data is worth to you.
My old place of work used to backup our webserver like this:
-weekly "dd" to an IDENTICAL drive as that in the server itself
-nightly ufsdump of the critical filesystems over to the mirror drive
-daily tape backup to a DLT, incremental and a monthly full image

This worked on a Solaris box, it was a Sparc, they flip IDs 0 and 1 (if I remember right) on boot, so we just set the mirror at ID2. This was a great setup, and it worked quite well until one of the drives died and someone (not me, I swear) tried to "dd" to the replacement from the production drive. They crossed-up the "if" and "of" args, so we copied a nice, formatted disk with a spanking new drive label on it over to our produciton webserver drive, that was a bad day. Luckily, the tape was there, and so I say again, get your data on a removable media, keep at least two copies and one HAS to be off-site. I may sound paranoid, but these are reasonable measures for a business that places value on it's data. If your computer makes you any sort of income (tangible or not), the data on that computer is worth, at minimum, what you make off of it, sometimes much more....

Later,

loadc

loadc

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LEARN ABOUT LINUX

cvcd

cvcd(1M)                                                  System Administration Commands                                                  cvcd(1M)

NAME

       cvcd - virtual console daemon

SYNOPSIS

       /platform/platform_name/cvcd

DESCRIPTION

       The virtual console daemon, cvcd, is a server process that supports the network console provided on some platforms. The cvcd daemon accepts
       network console connections from a remote host (only one host at any given time). Console input is read from this connection and  forwarded
       to cvc(7D) by way of cvcredir(7D).

       Similarly,  console  output is read from cvcredir(7D) and forwarded across the network console connection. If cvcd dies, console traffic is
       automatically rerouted through an internal hardware interface.

       The cvcd daemon normally starts at system boot time. Each domain supports only one cvcd process at a time.

       Caution:        On Sun Enterprise 10000 domains, cvcd uses a configuration file (/etc/ssphostname) to determine the name of the  host  from
                       which  network console connections are allowed. If the remote console host is renamed, you must edit the configuration file
                       to reflect that change.

OPERANDS

       The following operands are supported:

       platform_name           The official Sun platform name used in packaging and code. For example, for Sun Fire 15K servers, the platform_name
                               would     be SUNW,Sun-Fire-15000.

ATTRIBUTES

       See  attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Architecture                 |Sun     Enterprise    10000  |
       |                             |servers,  Sun Fire High-End  |
       |                             |Systems                      |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcvc.u                    |
       +-----------------------------+-----------------------------+

SEE ALSO

       svcs(1), svcadm(1M), services(4), attributes(5), smf(5), cvc(7D), cvcredir(7D)

       Sun Enterprise 10000 SSP Reference Manual

       System Management Services (SMS) Reference Manual

NOTES

       The cvcd service is managed by the service management facility, smf(5), under the service identifier:

       svc:/system/cvc

       Administrative  actions  on  this  service, such as enabling, disabling, or requesting restart, can be performed using svcadm(1M). The ser-
       vice's status can be queried using the svcs(1) command.

SunOS 5.10                                                          11 Aug 2004                                                           cvcd(1M)