Simple - time to perform the backup might still be shorter. A couple years ago I did a Data Domain install at a customer that was using SQL LiteSpeed for their SQL servers. SQL LiteSpeed was compressing the data before sending it over the wire.
Even though they got better dedup numbers with compression disabled, the time involved in sending the uncompressed data over the wire to the Data Domain was much longer than when they compressed it. If I remember correctly, it was on the order of 3-4x faster to do the backup with the LiteSpeed compression enabled. Data Domain doesn't provide the option of a share/export that bypasses the deduplication engine - if it did we would have used that. As it was, they had enough capacity in their Data Domain to handle a portion of data that did not deduplicate as well as theoretically possible. If you've got 10GbE everywhere, then this argument goes out the window. But I wanted to show that there are times when sending compressed data to a Data Domain makes sense. -daniel -----Original Message----- From: veritas-bu-boun...@mailman.eng.auburn.edu [mailto:veritas-bu-boun...@mailman.eng.auburn.edu] On Behalf Of Lightner, Jeff Sent: Thursday, August 18, 2011 1:14 PM To: VERITAS-BU@MAILMAN.ENG.AUBURN.EDU Subject: Re: [Veritas-bu] Data Domain Question Compressing compressed data sometimes has the effect of actually INCREASING the space utilized. Luckily deduplication is preventing this for you but really, why spend processing time on the server to compress data that is going to be compressed on the appliance? -----Original Message----- From: veritas-bu-boun...@mailman.eng.auburn.edu [mailto:veritas-bu-boun...@mailman.eng.auburn.edu] On Behalf Of rsavage Sent: Thursday, August 18, 2011 2:05 PM To: VERITAS-BU@MAILMAN.ENG.AUBURN.EDU Subject: [Veritas-bu] Data Domain Question Currently our SQL team run SQL LiteSpeed with compresson. They really dont want to turn it off. We keep 5 weeks of data for our SQL backups and are getting 2.1 to 3.5 dedupe ratio's even with compression backup on. +---------------------------------------------------------------------- |This was sent by rich.sav...@bcbsne.com via Backup Central. |Forward SPAM to ab...@backupcentral.com. +---------------------------------------------------------------------- _______________________________________________ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu Proud partner. Susan G. Komen for the Cure. Please consider our environment before printing this e-mail or attachments. ---------------------------------- CONFIDENTIALITY NOTICE: This e-mail may contain privileged or confidential information and is for the sole use of the intended recipient(s). If you are not the intended recipient, any disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you have received this electronic transmission in error, please reply immediately to the sender that you have received the message in error, and delete it. Thank you. ---------------------------------- _______________________________________________ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu _______________________________________________ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu