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Martin Hope
Jai
Asked: 2016-09-21 10:05:19 +0800 CST
  • 0

In lsblk command. I am seeing a 'part' type sub partition mounted under 'lvm' as below.

[root@srv ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 447.1G 0 disk
└─sda4 8:4 0 379.2G 0 part
  └─md3 9:3 0 379.1G 0 raid1
    ├─volgroup1-vsv1002--051j--vnifpdojudkszbiw 253:0 0 20G 0 lvm
    └─volgroup1-vsv1003--0foy--e7wcu4kzg0fgbyeb 253:1 0 50G 0 lvm
      └─volgroup1-vsv1003--0foy--e7wcu4kzg0fgbyeb1 253:2 0 49.9G 0 part <==

The lvm 'volgroup1-vsv1003' is a windows domU. As per my observation the 'part' disappears after main node reboot.

Can some please advice what is 'part' and why this is getting created ?

lvm centos7 domu
Martin Hope
Jai
Asked: 2016-06-14 03:26:10 +0800 CST
  • 2

I have recently created a Thin LVM. I notice the Data is at 1.60% and Meta at 1.21%.

[root@srv ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lv1 volgrp1 twi-aotz-- 410.00g 1.60 1.21

I have three questions:

  1. Is this Meta size expected. (almost equivalent to Data)
  2. Is it recommended to reduce/set metadata to a smaller value (using --poolmetadatasize).
  3. Are there any performance impact / concerns by setting a lower metadata size.

I appreciate your kind advice on this.

linux lvm centos7
Martin Hope
Jai
Asked: 2015-11-12 08:02:28 +0800 CST
  • 3

I got a chance to work on HP DL360p Gen8 server with Smart Array controller P420i/ZM

  1. What are the advantage of having FBWC or BBWC
  2. Will it be possible to add an external P420/1GB or P420/2GB to this server.
  3. Can a FBWC give better performance for RAID rebuild for replacement hard disk (we use RAID 1)
  4. Overall performance could get affected by Zero Memory controller ?

Can someone please share your insight on this.

raid