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1. [Networker] Time differences in writing 1Gb (score: 1): Author: "Maarten Boot (CWEU-USERS/CWNL)" <Maarten.Boot AT NL.COMPUWARE DOT COM>; Date: Mon, 19 Jul 2004 12:09:30 +0200; Networkers, Last week I wrote a small perl program to verify my LTO-2 tapes. I needed it after too many LTO tapes were marked full between 20 and 50 GB. On some tapes (not all) I see some interesting; /usr/local/webapp/mharc-adsm.org/html/Networker/2004-07/msg00241.html (12,953 bytes)
2. Re: [Networker] Time differences in writing 1Gb (score: 1): Author: Tim Mooney <mooney AT DOGBERT.CC.NDSU.NODAK DOT EDU>; Date: Mon, 19 Jul 2004 13:31:26 -0500; In regard to: [Networker] Time differences in writing 1Gb, Maarten Boot...: On some tapes (not all) I see some interesting time differences on an otherwise idle machine Hardware used: Sun E450 with 2; /usr/local/webapp/mharc-adsm.org/html/Networker/2004-07/msg00249.html (12,671 bytes)
3. Re: [Networker] Time differences in writing 1Gb (score: 1): Author: Howard Martin <howard.martin AT EDS DOT COM>; Date: Tue, 20 Jul 2004 04:40:12 -0400; Even better use bigasm on the machine with the tape drives, I doubt if many disks can keep up with a LTO-2 particularly if you get reasonable compression. -- Note: To sign off this list, send a "sign; /usr/local/webapp/mharc-adsm.org/html/Networker/2004-07/msg00259.html (11,441 bytes)
4. Re: [Networker] Time differences in writing 1Gb (score: 1): Author: "Maarten Boot (CWEU-USERS/CWNL)" <Maarten.Boot AT NL.COMPUWARE DOT COM>; Date: Tue, 20 Jul 2004 11:11:45 +0200; Tim, I realized that , thats why the program starts with preparing 1 block of data like cat /dev/random | gzip . The program thens reads only 1 block of 128 k into a buffer. Iit thens starts writing; /usr/local/webapp/mharc-adsm.org/html/Networker/2004-07/msg00260.html (14,020 bytes)
5. Re: [Networker] Time differences in writing 1Gb (score: 1): Author: "Maarten Boot (CWEU-USERS/CWNL)" <Maarten.Boot AT NL.COMPUWARE DOT COM>; Date: Tue, 20 Jul 2004 11:12:44 +0200; On good tapes the program gets 30 seconds for 1 GB -- Maarten Boot, Compuware Europe B.V. Hoogoorddreef 5 1101 BA Amsterdam -- Note: To sign off this list, send a "signoff networker" command via emai; /usr/local/webapp/mharc-adsm.org/html/Networker/2004-07/msg00261.html (12,248 bytes)
6. Re: [Networker] Time differences in writing 1Gb (score: 1): Author: Howard Martin <howard.martin AT EDS DOT COM>; Date: Tue, 20 Jul 2004 05:39:31 -0400; I've just realised that the times you gave are "running" times and not a series of times for different saves. I've seen this sort of thing before and assumed that it is due to other activity on the s; /usr/local/webapp/mharc-adsm.org/html/Networker/2004-07/msg00262.html (11,528 bytes)
7. Re: [Networker] Time differences in writing 1Gb (score: 1): Author: Mike Schwarz <schwarz AT LEARJET DOT COM>; Date: Tue, 20 Jul 2004 12:16:03 -0400; We saw the same thing earlier this year with a new STK tape library with IBM FC ULTRIUM2 drives with the same firmware (38D0). This library is connected to both an AIX p630 and HP L2000 servers. I wr; /usr/local/webapp/mharc-adsm.org/html/Networker/2004-07/msg00278.html (13,350 bytes)
8. Re: [Networker] Time differences in writing 1Gb (score: 1): Author: "Maarten Boot (CWEU-USERS/CWNL)" <Maarten.Boot AT NL.COMPUWARE DOT COM>; Date: Wed, 21 Jul 2004 11:12:37 +0200; Thanks Mike , That is very helpfull as is the most accurate description of the phenomenon that we see here. I did find hints to different drivers for HP on the web but no luck so far for Solaris. You; /usr/local/webapp/mharc-adsm.org/html/Networker/2004-07/msg00298.html (14,450 bytes)

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