From: Peter R (niagarap@HOTMAIL.COM)
Date: Fri Dec 06 2002 - 14:18:09 EST
Thanks alot Mike for your suggestions, we are trying to set different block
sizes..But still running into problems...But I appreciate your info.
>From: Mike_Giammarino@praxair.com
>To: niagarap@HOTMAIL.COM
>Subject: AIX 415 Disaster recovery problems..
>Date: Fri, 6 Dec 2002 07:57:07 -0500
>
>Hope you don't mind the e-mail, it's just that I've posted this before.
>I am running AIX 4.3.3 with DLT 7000's attached and have used tar, cpio,
>and backup over time. Here is what I've found to work for me.
>When backing up a filesystem, I set "BLOCK size" to 0 on the output tape
>unit and the number of 512 buffers to 128. The cpio option is C128, backup
>is b128, I add this to whatever other options I use.
>When restoring, I set the "BLOCK size" to 65536 on the input tape unit and
>still set the number of 512 buffers to 128 on the cpio or restore command.
>I've tested various combinations of block and buffer sizes and found this
>to work best for me.
>I did find at times the restore would take 5 to 7 times longer than the
>backup took. But, that was only if I deleted and created the filesystem
>or, if I built the filesystem on another server then tried to restore it.
>I've found that if I reboot the server after creating the filesystem(s),
>the restore time was about the same as the backup time. I don't know why
>this worked for me but it did.
>I found this out when testing our disaster/recovery procedures.
>I use backup now because of the 2GB file size limit with cpio.
>Just my experience, hope it helps.
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