> -----Original Message----- > From: Eric Sandeen [mailto:sandeen@xxxxxxxxxx] > Sent: 09/23/2008 10:02 > To: Theodore Tso > Cc: Ulf Zimmermann; ext3-users@xxxxxxxxxx > Subject: Re: ext3 zerofree option and RedHat back port? > > Theodore Tso wrote: > > On Tue, Sep 23, 2008 at 10:13:20AM -0500, Eric Sandeen wrote: > >> Ulf Zimmermann wrote: > >>> Can anyone tell me if the zerofree option for ext3 has been back > ported > >>> to RedHat EL4 or EL5? > >> there appears to be no backporting to do; it's a single .c file that > >> makes simple use (I assume...) of libext2... > >> > >> But no, it's not in Fedora, EPEL, or RHEL. Builds fine on my rhel5 > box. > >> > >> If you wanted to, you could be the maintainer for Fedora, and put it > >> into EPEL, which would make it available for RHEL :) > > > > Or it would be roughly a 5 line change to e2image (3 for option > > parsing, 1 for the usage line, and 1 to the if statement in > > write_raw_image_file() :-) to add an option to extend the "raw dump" > > functionality to also dump the data blocks of files, at which point > it > > would create a sparse file containing only the used blocks in the > > filesystem for you, automatically. > > > > - Ted > > hey that sounds even better than a random collection of single-purpose > utilities! ;) > > (But I suppose the original util had the other useful purpose of > scrubbing free blocks even if you don't intend to compress the fs > image...) > > -Eric 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. Ulf Zimmermann _______________________________________________ Ext3-users mailing list Ext3-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ext3-users
