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boundary="===============0386182898771641611==" --===============0386182898771641611== Content-Language: en-US Content-Type: multipart/alternative; boundary="_000_CO1PR11MB5009B1F51212981FB8292E99F1D19CO1PR11MB5009namp_" --_000_CO1PR11MB5009B1F51212981FB8292E99F1D19CO1PR11MB5009namp_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Experts, When use lvcreate to claim 72M partition, but it turns out to be 69M, more = details as below, any hints? root@intel-x86-64:~# tmp_dir=3D`mktemp -d /tmp/XXXXXX` root@intel-x86-64:~# dd if=3D/dev/zero of=3D${tmp_dir}/p0 bs=3D1M count=3D1= 00 100+0 records in 100+0 records out 104857600 bytes (105 MB, 100 MiB) copied, 2.75714 s, 38.0 MB/s root@intel-x86-64:~# losetup /dev/loop0 ${tmp_dir}/p0 loop0: detected capacity change from 0 to 204800 root@intel-x86-64:~# vgcreate vg_test1 /dev/loop0 Physical volume "/dev/loop0" successfully created. Volume group "vg_test1" successfully created root@intel-x86-64:~# lvcreate -L 72 -n lv_test1 vg_test1 blk_update_request: operation not supported error, dev loop0, sector 2048 o= p 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg 00 Logical volume "lv_test1" created. root@intel-x86-64:~# lvscan ACTIVE '/dev/vg_test1/lv_test1' [72.00 MiB] inherit root@intel-x86-64:~# mke2fs -I 128 /dev/vg_test1/lv_test1 mke2fs 1.46.5 (30-Dec-2021) 128-byte inodes cannot handle dates beyond 2038 and are deprecated Discarding device blocks: done Creating filesystem with 73728 1k blocks and 18432 inodes Filesystem UUID: 0308c2e2-6f97-4472-9fb9-0d20ae0851b6 Superblock backups stored on blocks: 8193, 24577, 40961, 57345 Allocating group tables: done blk_update_request: operation not supported error, dev loop0, sector 149376= op 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg0 Writing inode tables: blk_update_request: operation not supported error, de= v loop0, sector 2570 op 0x9:(WRITE_ZEROES) fla0 blk_update_request: operation not supported error, dev loop0, sector 18954 = op 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg 0 blk_update_request: operation not supported error, dev loop0, sector 34822 = op 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg 0 blk_update_request: operation not supported error, dev loop0, sector 51722 = op 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg 0 blk_update_request: operation not supported error, dev loop0, sector 67590 = op 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg 0 blk_update_request: operation not supported error, dev loop0, sector 84490 = op 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg 0 blk_update_request: operation not supported error, dev loop0, sector 100358= op 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg0 blk_update_request: operation not supported error, dev loop0, sector 117258= op 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg0 blk_update_request: operation not supported error, dev loop0, sector 133126= op 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg0 done Writing superblocks and filesystem accounting information: done root@intel-x86-64:~# mkdir -p ${tmp_dir}/lv1 root@intel-x86-64:~# mount /dev/vg_test1/lv_test1 ${tmp_dir}/lv1 EXT4-fs (dm-0): mounting ext2 file system using the ext4 subsystem EXT4-fs (dm-0): mounted filesystem without journal. Opts: (null). Quota mod= e: none. ext2 filesystem being mounted at /tmp/inBS27/lv1 supports timestamps until = 2038 (0x7fffffff) root@intel-x86-64:~# df -h | grep ${tmp_dir}/lv1 /dev/mapper/vg_test1-lv_test1 69M 14K 65M 1% /tmp/inBS27/lv1 root@intel-x86-64:~# --_000_CO1PR11MB5009B1F51212981FB8292E99F1D19CO1PR11MB5009namp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Experts,

When use lvcreate to claim 72M partition, but it turns out to be 69M, more = details as below, any hints?


root@intel-x86-64:~# tmp_dir=3D`mktemp -d /tmp/XXXXXX`
root@intel-x86-64:~# dd if=3D/dev/zero of=3D${tmp_dir}/p0 bs=3D1M coun= t=3D100
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 2.75714 s, 38.0 MB/s
root@intel-x86-64:~# losetup /dev/loop0 ${tmp_dir}/p0
loop0: detected capacity change from 0 to 204800
root@intel-x86-64:~# vgcreate vg_test1 /dev/loop0
  Physical volume "/dev/loop0" successfully created.
  Volume group "vg_test1" successfully created
root@intel-x86-64:~# lvcreate -L 72 -n lv_test1 vg_test1
blk_update_request: operation not supported error, dev loop0, sector 2= 048 op 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg 00
  Logical volume "lv_test1" created.
root@intel-x86-64:~# lvscan
  ACTIVE            '/dev/vg_test1/= lv_test1' [72.00 MiB] inherit
root@intel-x86-64:~# mke2fs -I 128 /dev/vg_test1/lv_test1
mke2fs 1.46.5 (30-Dec-2021)
128-byte inodes cannot handle dates beyond 2038 and are deprecated
Discarding device blocks: done           &nbs= p;                
Creating filesystem with 73728 1k blocks and 18432 inodes
Filesystem UUID: 0308c2e2-6f97-4472-9fb9-0d20ae0851b6
Superblock backups stored on blocks:
8193, 24577, 40961, 57345

Allocating group tables: done            = ;                
blk_update_request: operation not supported error, dev loop0, sector 1= 49376 op 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg0
Writing inode tables: blk_update_request: operation not supported erro= r, dev loop0, sector 2570 op 0x9:(WRITE_ZEROES) fla0
blk_update_request: operation not supported error, dev loop0, sector 1= 8954 op 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg 0
blk_update_request: operation not supported error, dev loop0, sector 3= 4822 op 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg 0
blk_update_request: operation not supported error, dev loop0, sector 5= 1722 op 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg 0
blk_update_request: operation not supported error, dev loop0, sector 6= 7590 op 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg 0
blk_update_request: operation not supported error, dev loop0, sector 8= 4490 op 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg 0
blk_update_request: operation not supported error, dev loop0, sector 1= 00358 op 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg0
blk_update_request: operation not supported error, dev loop0, sector 1= 17258 op 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg0
blk_update_request: operation not supported error, dev loop0, sector 1= 33126 op 0x9:(WRITE_ZEROES) flags 0x800800 phys_seg0
done                   &n= bsp;        
Writing superblocks and filesystem accounting information: done

root@intel-x86-64:~# mkdir -p ${tmp_dir}/lv1
root@intel-x86-64:~# mount /dev/vg_test1/lv_test1 ${tmp_dir}/lv1
EXT4-fs (dm-0): mounting ext2 file system using the ext4 subsystem
EXT4-fs (dm-0): mounted filesystem without journal. Opts: (null). Quot= a mode: none.
ext2 filesystem being mounted at /tmp/inBS27/lv1 supports timestamps u= ntil 2038 (0x7fffffff)
root@intel-x86-64:~# df -h | grep ${tmp_dir}/lv1
/dev/mapper/vg_test1-lv_test1   69M   14K   65M   = 1% /tmp/inBS27/lv1
root@intel-x86-64:~#


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