Re: Speed on 3581 LTO-2 Tape Drive

[Wayne McAlpine <wmcalpine@xxxxxxxxxxxxxxxxx>]

I'm not logging the IFS save so I don't know the amount of storage used. 
 I don't have the latest version of the IFSTOOLS that lets you exclude 
QOPT, so I can't do a global query to determine size.

richard@xxxxxxxxxxx wrote:
> Hello Wayne, 
>
> What was the total size for the 222,000 IFS objects ?   Our 3.8 million 
> objects take up about 100gb. 
>
> If your 222,000 objects are only about 11gb, I would have expected just a 
> few minutes to back them up if the tape drive was running at close to 
> rated speeds. 
>
> I think it's the large number of small objects that is killing performance 
> because the tape drive probably never gets into streaming mode. 
>
> However this is pure speculation since I'm still learning the 3581 :-)
>
> Regards,
> Richard Schoen
> RJS Software Systems Inc. 
>
> Email: richard@xxxxxxxxxxxxxxx
> Web Site: http://www.rjssoftware.com
> Tel: (952) 898-3038
> Fax: (952) 898-1781
> ----------------------------------------------------------------------------------
> Our last backup of 222,000 IFS objects took 37 minutes with a 3582 tape 
> library HVD-attached to a Model 740, so 8 to 9 hours sounds right.  One 
> suggestion, if you have enough DASD, is to try saving the images to a 
> save file and then saving the save file to tape.
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