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тАО01-21-2009 12:08 AM
тАО01-21-2009 12:08 AM
[Data Protector Express] Error 1401 and size limitation
I have some problems with my daily saves : Before, I was used to see the error 1401 "Please insert compatible media". I tried different actions, like modify rotation (with and without), the hardware and software compression, scan my device and medias with a hp utility, and more. But nothing has changed.
Then I noticed the save always stopped at 37~38 Gb. I have removed some files, now the save takes ~34 Gb, and it works.
Good new, but why? I use HP DAT72 cartridge, with both software compression and hardware compression (I tried without).
So what is the matter? Thanks for your responses, and sorry for my english (I'm French)
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тАО01-21-2009 01:07 PM
тАО01-21-2009 01:07 PM
Re: [Data Protector Express] Error 1401 and size limitation
What hardware are you working with and what version of DPE ?
Pablo Alavarado Siles
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тАО03-24-2009 12:50 AM
тАО03-24-2009 12:50 AM
Re: [Data Protector Express] Error 1401 and size limitation
I tried like you said (without software compression with no rotation), but it didn't worked. The save always stops at about ~38Gb.
It really makes me trouble because I must select the data to save, and they are all important.
Thank you in advance
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тАО03-24-2009 07:34 AM
тАО03-24-2009 07:34 AM
Re: [Data Protector Express] Error 1401 and size limitation
http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?lang=en&cc=us&prodTypeId=12169&prodSeriesId=1144272&prodNameId=1144275&swEnvOID=1005&swLang=13&mode=2&taskId=135&swItem=co-58946-1
Pablo Alvarado Siles
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тАО04-27-2009 12:11 AM
тАО04-27-2009 12:11 AM
Re: [Data Protector Express] Error 1401 and size limitation
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тАО04-28-2009 07:33 AM
тАО04-28-2009 07:33 AM
Re: [Data Protector Express] Error 1401 and size limitation
But other kinds of data like jpeg and mpeg cannot be compressed, because the data has already been compressed as part of the save process. Compression removes patterns from data... and if it's done well, there are no (or are very few) patterns left in the data for the next round of compression to work with.
Also note that there are two types of compression, called "lossy" and "lossless". "Lossy" compression is used in jpeg and mpeg data. As you edit and re-save a jpeg, for instance, each time it looses a bit more of the data, so the next time you read it it will be just a bit more pixellated, until it looks quite ugly.
Contrast that with "lossless" compression, which is used in tape drives and .zip compression. The file we get back when we decompress the data is exactly the same as it was before compression. You have to do this with business data; you can't afford to have an address changed in a database, or a plus sign in a spreadsheet become a minus sign because of compression!
For your problem there are several possible solutions: 1) Select all the files you need to back up, be prepared to switch tapes in the middle of the backup, or, 2) Create two backup jobs, to be run on alternate days, with each job backing up about half the data, or, 3) Separate your data in to 'buckets' where bucket 1 doesn't change and bucket 2 is data that is new or often changing, then only back up bucket 1 infrequently (could be weekly or monthly) but back up bucket 2 frequently (daily or weekly), or, 4) Purchase a higher-capacity tape drive. DAT160 has more than twice the capacity of DAT72 and can read DAT72 tapes; LTO is not only much higher capacity, but also much faster -- if your server is able to send it data fast enough, your backup times will be much shorter than with DAT72.
Liberty breeds responsibility; Government breeds dependence
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тАО05-03-2009 10:23 PM
тАО05-03-2009 10:23 PM