"Ulf Zimmermann" <ulf@xxxxxxxxxxxx> wrote: >Reason I asked is this. We use currently 3Par S400 and E200 as SAN >arrays. The new T400 and T800 has a built in chip to do more intelligent >thin provisioning but I believe even the S400 and E200 we have will free >on the SAN level a block of a thin provisioned volume if it gets zero'ed >out. Haven't gotten around yet to test it, but I am planning on. We are >currently using 3 different file system types, one is a propriety from >Onstor for their Bobcats (NFS/CIFS heads) where I believe I have >observed just freeing of SAN level blocks. The two other are EXT3 and >OCFS2. Interesting. A similar case I've seen recently is s3backer, a FUSE filesystem that keeps its blocks as objects in Amazon S3: http://code.google.com/p/s3backer/ Blocks of zeroes aren't actually stored, so they suggest using zerofree to get rid of non-zero deleted blocks and avoid being charged for them. Ron _______________________________________________ Ext3-users mailing list Ext3-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ext3-users
