Re: [Networker] Disaster Recovery testing
2006-05-10 06:06:05
I've have successfully done several serious DR tests with my backup
environment (Win 2000, Legato 6.1.4 and 7.1.1, HP MSL5000 series
libraries). Successfully recovering 2 Sun Solaris, 1 HP-UX, 1 AIX and 16
servers running several windows versions.
Our live systems run on HP hardware and our DR site has Dell hardware. The
first thing to beware of is TCP/IP speeds and duplex FIXED on both server
and switch, but secondly the BLOCKSIZE configuration on your scsi bus and
within Legato. unix/linux tends to use 128k blocks by default (correct me
if I'm wrong) and windows defaults to 64k blocks. This may explain DR
problems when using a Windows box to restore a linux client.
You can use the following command on your legato windows box to check the
scsi block size:
mt â??f \\.\Tape0 status (this allows you to check the maximum block size of
the tape drive. When this is not 128k or above, you need to make a setting
on the scsi adapter in the registry:
HKLM\SYSTEM\CurrentControlSet\Services\<scsidriver>\parameters\device; add
DWord MaximumSGList=FF)
The above text is applicable to our standard 128k block size; this may not
apply to other environments.
Not having configured the same block size on your DR legato server as the
tape were written with will result in slow performance, errors and even
worse recovery failures.
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