From mboxrd@z Thu Jan 1 00:00:00 1970 From: mulyadi.santosa@gmail.com (Mulyadi Santosa) Date: Thu, 29 Dec 2011 18:52:38 +0700 Subject: help regarding ext4 extend and multiblock allocation In-Reply-To: References: Message-ID: To: kernelnewbies@lists.kernelnewbies.org List-Id: kernelnewbies.lists.kernelnewbies.org Hi Swapnil... On Thu, Dec 29, 2011 at 10:42, Swapnil Gaikwad wrote: > How the extend is different from block allocation? The way I see extent is: it's like doing cluster allocation. Meaning, you don't allocate it one by one, but as a whole. For example, with extent size 1 MB and block size 4 KB, it means filesystem allocate 256 blocks at once. Although it sounds like multi block allocation or read ahead, I think the underlying implementation is a bit different. Sorry, this is the best I know -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com