🚀 go-pugleaf

In article <1992May20.150945.14909@rdg.dec.com>, sybertz@brsux0.bro.dec.com (Marc Sybertz) writes:
>Newsgroups: misc.wanted,aus.wanted,comp.sys.sgi,comp.sys.dec,comp.sys.sun.wanted
>From: sybertz@brsux0.bro.dec.com (Marc Sybertz)
>Subject: Re: Multivendor network backup for unix workstations
>Reply-To: sybertz@ketje.enet.dec.com
>
>
>--In article <ROMIG.92May19133332@brachiosaur.cis.ohio-state.edu>, romig@brachiosaur.cis.ohio-state.edu (Steve Romig) writes:
>>From: romig@brachiosaur.cis.ohio-state.edu (Steve Romig)
>>Newsgroups: misc.wanted,aus.wanted,comp.sys.sgi,comp.sys.dec,comp.sys.sun.wanted
>>Subject: Re: Multivendor network backup for unix workstations
>>
>>If someone could give me a number like "10% of the amount backed up"
>>or "15kb per file backed up" or something, I could make reasonable
>>and useful estimates.
>>
>>--- Steve
>>

Based on the info you mailed me, I estimate the total space needed for 
your indexes to 1.548 GB. (with a pick to 1.9GB).
Regarding the benefit for users when they want to browse, it is very cheap.

Look below for the estimation calculation.
 
Regards,
Marc Sybertz.

+------------------------------------------+
| From : Marc Sybertz                      |
| Dept : EIS - Unix Service Center         |
| Func : Unix System Management Specialist |
| Mail : sybertz@ketje.enet.dec.com        |
| Loc  : DIGITAL - BRO (Brussels, Belgium) |
+------------------------------------------+

  1.700.000 files
  x     150 bytes
-----------------
255.000.000 bytes -> 243MB for full backup

Based on a average change of 15% (which is the common one on our machines here
at Brussels, but it depends of course of the environment) :

  1.700.000 x 15% = 255.000
		    x   150
		  ---------
		 37.500.000 bytes -> 36MB for 2 backups a day

  1.700.000 x 15% = 255.000 x 7 = 1.785.000
				  x     150
				-----------
				267.750.000 bytes -> 255 MB for a backup a week

 Date	  MB index needed	Total
-------   ---------------       -----
01   00         243              243
01 m 01          36              279
01 t 02          36              315
01 w 03          36              351
01 t 04          36              387
01 f 05          36              423
01 s 06          36              459
01 s 07         255              714
01 m 08          36              750
01 t 09          36              786
01 w 10          36              822
01 t 11          36              858
01 f 12          36              894
01 s 13          36              930
01 s 14         255             1185
01 m 15          36             1221
01 t 16          36     -  36   1257	-36 = recycling dayly tape 
01 w 17          36     -  36   1257	      and purging corresponding indexes
01 t 18          36     -  36   1257
01 f 19          36     -  36   1257
01 s 20          36     -  36   1257
01 s 21         255     -  36   1512
01 m 22          36     -  36   1512
01 t 23          36     -  36   1512
01 w 24          36     -  36   1512
01 t 25          36     -  36   1512
01 f 26          36     -  36   1512
01 s 27          36     -  36   1512
01 s 28         255     -  36   1767
01 m 29          36     -  36   1767
01 t 30          36     -  36   1767
01 w 31          36     -  36   1767
02 t 01         243     -  36   1974
02 f 02          36     - 279   1695	-279 = recycling dayly tapes
02 s 03          36     -  36   1695	       and purging dayly and monthly indexes
02 s 04         108     - 255   1548    -255 = recycling weekly tapes
					       and purging weekly index