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EMC Centera and backup
Hi,
When I back data up from an EMC Centera system, is the data on tape also optimized using the content addressing scheme? Dvy |
#2
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EMC Centera and backup
Dvy,
First, I'm assuming that you are referring to 'optimization' - as the blob - de-duping / single instance storage right? Inside the Centera - lot's of misunderstanding about what is de-duped and what isn't. CDFs are never duplicated. Blobs even though the same, are stored in Centera as duplicates if - they are embedded in a CDF, or the naming scheme used is anything other than M or M++. GM naming kinda does sometimes - depending on parameters. Lot's of machines - configed so that de-duping doesn't occur. If the app does anything with the blob - it can mess up de-dupe. (i.e. Legato EX and Symantec EV put data into a container, and even though objects in the container are the same - Centera can't de-dupe them. All that being said, and assuming that you've got dupe data in the Centera, that has been de-duped by the Centera - when it goes to tape, with either of the EMC tools for backing up a Centera (CASBAR or CBRM), your data will be re-populated. That is any effect of de- duping is removed. At StorageSwitch, we have some tools for BU of a Centera, that are currently in test, that will give you the option of maintaining the de- dupe, or not. Feel free to give me a shout if you have any questions clark @ storageswitch . com. On Jan 30, 9:19 am, wrote: Hi, When I back data up from an EMC Centera system, is the data on tape also optimized using the content addressing scheme? Dvy |
#3
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EMC Centera and backup
On Feb 1, 8:12 am, wrote:
Dvy, First, I'm assuming that you are referring to 'optimization' - as the blob - de-duping / single instance storage right? Inside the Centera - lot's of misunderstanding about what is de-duped and what isn't. CDFs are never duplicated. Blobs even though the same, are stored in Centera as duplicates if - they are embedded in a CDF, or the naming scheme used is anything other than M or M++. GM naming kinda does sometimes - depending on parameters. Lot's of machines - configed so that de-duping doesn't occur. If the app does anything with the blob - it can mess up de-dupe. (i.e. Legato EX and Symantec EV put data into a container, and even though objects in the container are the same - Centera can't de-dupe them. All that being said, and assuming that you've got dupe data in the Centera, that has been de-duped by the Centera - when it goes to tape, with either of the EMC tools for backing up a Centera (CASBAR or CBRM), your data will be re-populated. That is any effect of de- duping is removed. At StorageSwitch, we have some tools for BU of a Centera, that are currently in test, that will give you the option of maintaining the de- dupe, or not. Feel free to give me a shout if you have any questions clark @ storageswitch . com. On Jan 30, 9:19 am, wrote: Hi, When I back data up from an EMC Centera system, is the data on tape also optimized using the content addressing scheme? Dvy Thankyou. How about on the NetApp NearStor platform? How well does it perform De-Dup? And will files that I backup from it via my Media Server to tape also be optimized? Dvy |
#4
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EMC Centera and backup
On Feb 1, 11:26 am, wrote:
On Feb 1, 8:12 am, wrote: Dvy, First, I'm assuming that you are referring to 'optimization' - as the blob - de-duping / single instance storage right? Inside the Centera - lot's of misunderstanding about what is de-duped and what isn't. CDFs are never duplicated. Blobs even though the same, are stored in Centera as duplicates if - they are embedded in a CDF, or the naming scheme used is anything other than M or M++. GM naming kinda does sometimes - depending on parameters. Lot's of machines - configed so that de-duping doesn't occur. If the app does anything with the blob - it can mess up de-dupe. (i.e. Legato EX and Symantec EV put data into a container, and even though objects in the container are the same - Centera can't de-dupe them. All that being said, and assuming that you've got dupe data in the Centera, that has been de-duped by the Centera - when it goes to tape, with either of the EMC tools for backing up a Centera (CASBAR or CBRM), your data will be re-populated. That is any effect of de- duping is removed. At StorageSwitch, we have some tools for BU of a Centera, that are currently in test, that will give you the option of maintaining the de- dupe, or not. Feel free to give me a shout if you have any questions clark @ storageswitch . com. On Jan 30, 9:19 am, wrote: Hi, When I back data up from an EMC Centera system, is the data on tape also optimized using the content addressing scheme? Dvy Thankyou. How about on the NetApp NearStor platform? How well does it perform De-Dup? And will files that I backup from it via my Media Server to tape also be optimized? Dvy You bet, I don't know about de-dupe in NetApp product. Heard about the capability last week, but haven't seen anything on it yet. Unless the backup app has a 'backdoor' into the NearStor, I would presume that it will not be able to maintain the de-duplication in the backups. Gimme a yell if you go the Centera route. I have a lot of experience there. 303.859.3321. ...clark |
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