From: "Lakshmipathi.G" <lakshmipathi.g@giis.co.in>
To: linux-btrfs@vger.kernel.org
Subject: Large no.of extents for a single small file with a fresh RAID5 setup
Date: Sat, 18 Feb 2017 07:37:11 +0530 [thread overview]
Message-ID: <20170218020711.GA23608@giis.co.in> (raw)
Hi,
With RAID5, using 3 loop-back devices each has 4GB. On a fresh setup, created a 2mb file.
While checking no.of extents,it shows like:
# ./btrfs-debugfs -f /mnt/file2m.txt
(257 0): ram 110592 disk 145227776 disk_size 114688
(257 110592): ram 4096 disk 145461248 disk_size 4096
(257 114688): ram 114688 disk 145342464 disk_size 118784
(257 229376): ram 712704 disk 145620992 disk_size 716800
(257 942080): ram 4096 disk 145096704 disk_size 4096
(257 946176): ram 737280 disk 146407424 disk_size 741376
(257 1683456): ram 413696 disk 147193856 disk_size 413696
file: /mnt/file2m.txt extents 7 disk size 2113536 logical size 2097152 ratio 0.99
Is this expected behaviour? Is there any mount option to minimize no.of extents for
a smaller file?
Cheers.
Lakshmipathi.G
next reply other threads:[~2017-02-18 2:08 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-18 2:07 Lakshmipathi.G [this message]
[not found] ` <678a9608-8f42-119c-7fd3-69fbae31bfab@cn.fujitsu.com>
2017-02-20 14:07 ` Large no.of extents for a single small file with a fresh RAID5 setup Lakshmipathi.G
[not found] ` <af2aba3e-467d-6546-e9a0-e8bcc460fbd2@cn.fujitsu.com>
2017-02-21 9:22 ` Lakshmipathi.G
[not found] ` <1b567b5e-8035-33ce-ddd2-2e19065044c6@cn.fujitsu.com>
2017-02-21 10:14 ` Lakshmipathi.G
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