Yes, I do backups on DLT 4500 drive and I use DLT IV media (40/80 GB). When I produce some aditionaly load thrue NFS, I can write on DLT as much fast as you are (5MB/s), but with no load (except backup), I get 500kB/s. Isn't that wierd?
-----Original Message----- From: Jeff Burton [mailto:burtonj@pprd.abbott.com] Sent: Monday, January 27, 2003 3:54 PM To: toasters@mathworks.com Subject: Re: Backup performances
Assuming you are backing up to tape, how many and what type of tape drives are you writing to? We are mostly backing up to DLT's and they max out around 5555kB/s. I have never used OmniBak Disk Agent, but in NetBackup we increased the number of data streams to 4 so we can get about 80GB an hour.
-------------------------------------------------------------- Jeff Burton UNIX Administrator Dept. GB34/Bldg. AP9A-LL EMAIL: burtonj@pprd.abbott.com Abbott Laboratories PHONE: 847-935-5778 100 Abbott Park Rd. FAX: 847-935-0142 Abbott Park, IL 60064-6115
On Mon, Jan 27, 2003 at 09:51:22AM +0100, matej.moskon@ourspace.si wrote:
Hi toasters!
I'm facing with very odd performance issue during the backup of snapshots. I have OmniBak Disk Agent instaled on HP-UX 11.0 and F740 DOT 6.0.1R3 when I start with backup procedure, the performances are as follow (sysstat 2):
CPU NFS CIFS HTTP Net kB/s Disk kB/s Tape kB/s Cache 21% 179 12 0 113 1061 2205 0 0 0 1 19% 207 8 0 167 1153 1132 0 0 0 1 21% 127 8 0 114 555 1473 868 0 0 1 17% 128 51 0 118 514 525 0 0 0 1 16% 114 15 0 124 319 353 0 0 0 1 16% 109 11 0 116 347 656 0 0 0 1 16% 123 5 0 127 308 369 0 0 0 1 20% 168 10 0 117 894 878 844 0 0 1 16% 115 5 0 143 331 543 0 0 0 1 16% 123 12 0 138 283 241 0 0 0 2 18% 147 9 0 131 623 1370 0 0 0 2 29% 364 7 0 183 2970 6333 0 0 0 2
As you can see, there is practicaly no network traffic. When I perform more load on Filer thrue HP server (such as tar or copy data on filer), the speed of writing on LTO is about 10 times faster:
CPU NFS CIFS HTTP Net kB/s Disk kB/s Tape kB/s Cache 76% 1093 41 0 388 23459 22188 1114 0 0 0 69% 1065 8 0 296 23111 22049 0 0 0 0 65% 735 6 0 342 20897 20332 0 0 0 0 58% 673 14 0 270 17603 17106 0 0 0 0 68% 869 48 0 257 22127 21323 0 0 0 0 82% 1020 50 0 7776 14957 13749 1315 0 0 0 77% 925 15 0 3213 13063 13185 8583 0 0 0 76% 1163 10 0 350 25681 24400 0 0 0 0 67% 986 63 0 389 19134 19058 0 0 0 0 68% 922 288 0 315 19461 18464 0 0 0 0 66% 943 101 0 248 20260 18998 0 0 0 0 75% 1067 9 0 277 23741 23182 458 0 0 0 79% 1025 14 0 270 22664 22671 4621 0 0 0 76% 891 24 0 236 26903 25523 0 0 0 0 80% 1064 164 0 314 26847 25485 0 0 0 0
Do you have any idea what is going on?
Matej
Matej Moškon Our Space Appliances d.o.o. Tbilisijska 59, 1111 Ljubljana email: matej.moskon@ourspace.si tel: + 386 01 24 25 392 faks: + 386 01 24 25 382 http://www.ourspace.si