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17 Posts
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815
March 23rd, 2010 02:00
Find out which Data in SavVol
How can i find out which Data ist stored in savvol. I need a possibility to find out which data is in the SavVol and which is stored in the PFS. When a Data is modified the orginal one will be stored in SavVol (COFW), how can i find out which data ist stored in the savvol?
Can you help me?
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Peter_EMC
674 Posts
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March 23rd, 2010 04:00
the only way is to use fs_ckpt fsname -l -all which will give you a list of all checkpoints of a PFS and the percentage of savvol usage.
But thats it.
COFW is working on blocklevel, not file level.
You will not be able to see which data block is in the savvol or the data of the block. There is no command for this.
Sorry.
Peter_EMC
674 Posts
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March 23rd, 2010 03:00
the data in the savvol is the "old" data needed for the Snaps.
The most recent data is in the PFS itself.
It is only old data stored in the Savvol (COFW) which is necessary for the snaps.
If you loose/delete the savvol, the PFS will not be affected, but the snaps are no longer available.
maheum
17 Posts
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March 23rd, 2010 03:00
Ok. But how can i see which data is in the SavVol or where can i see which file is modified and moved through COFW?!
maheum
17 Posts
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March 23rd, 2010 05:00
Hi Peter,
thanks for the answer. This is that what i want to know, is there a possbilty or not. Now i have an answer for my question ;-)
Thanks.
Br
Mario
nandas
6 Operator
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1.5K Posts
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March 23rd, 2010 08:00
Hi Mario,
Peter has already provided you the answer you were looking for. I just like to add that, you can access the checkpoints of a PFS from a client and check which data set you need from the checkpoints - you can not directly access the data on SavVol as it stores only the changed blocks on the PFS after a checkpoint was taken - but the checkpoint maintains the pointers for every data block and present you the entire file system data what it was at that time when checkpoint was taken.
Happy to add my 2 cents
Sandip