Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Xiaojie_D_Intel
Employee
36 Views

LVM disk io slow on KNL 7250 with CentOS 7.3

We recently found the disk io on LVM partition is very slow on KNL 7250 with CentOS7.3. The disk is 800G SSD with SATA6, xxpsl is installed and MCDRAM is set to cache mode. Any thing wrong?

/dev/sda1: <= non LVM
 Timing buffered disk reads: 980 MB in  3.00 seconds = 326.28 MB/sec

/dev/sda2: <= LVM
 Timing buffered disk reads: 490 MB in  3.00 seconds = 163.21 MB/sec

and disk layout

========  

Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200  1562822655   780361728   8e  Linux LVM

Disk /dev/mapper/cl-root: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/mapper/cl-swap: 4294 MB, 4294967296 bytes, 8388608 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/mapper/cl-home: 741.1 GB, 741104156672 bytes, 1447469056 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

 

0 Kudos
0 Replies