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Date: Wed, 10 Aug 2011 07:34:46 +0100 From: Ric Wheeler <ricwheeler@...il.com> To: "H. Peter Anvin" <hpa@...or.com> CC: linux-ext4@...r.kernel.org Subject: Re: Feature request: e2fsck -z On 08/09/2011 06:52 PM, H. Peter Anvin wrote: > Hi all, > > This is something I've wanted to see for a very long time, and it > finally occurred to me that perhaps I should say something about it! > > It would be a very nice thing to have a flag to e2fsck, presumably -z, > to zero out any unused data blocks, inodes and so on. The goal is to > minimize the amount of space required after compressing a virtual disk > image or similar, and to make sure any non-data isn't lying around. > > -hpa > Do you need it to be in the fsck tool? If you have a sparsely allocated block map under your file system, doing a zero of all blocks could add hours for a big, slow S-ATA drives (2-3 hours for a 1TB drive). An alternative for SSD's and devices that do TRIM/UNMAP would be to use one of the batched discard tools (that would make discarded data read back as zeroed). Thanks! Ric -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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