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Chapter 18. Provisioning Storage
Amazon Elastic Block Storage (EBS) is designed specifically for use with Amazon EC2 instances. Amazon EBS provides storage that behaves like a raw, unformatted, external block device.
Important
External snapshots, such as snapshots of a virtual machine/instance, where Red Hat Storage Server is installed as a guest OS or FC/iSCSI SAN snapshots are not supported.
18.1. Provisioning Storage for Two-way Replication Volumes
링크 복사링크가 클립보드에 복사되었습니다!
The supported configuration for two-way replication is eight Amazon EBS volumes of equal size on software RAID 0 (stripe), attached as a brick, which enables consistent I/O performance. You can create a brick ranging from 8 GB to 8 TB. For example, if you create a brick of 128 GB, you must create 8 Amazon EBS volumes of size 16 GB each and then assemble them into a RAID 0 array.
Single EBS volumes exhibit inconsistent I/O performance. Hence, other configurations are not supported by Red Hat.
To Add Amazon Elastic Block Storage Volumes
- Login to Amazon Web Services at http://aws.amazon.com and select the tab.
- In the select the option to add the Amazon Elastic Block Storage Volumes
- In order to support configuration as a brick, assemble the eight Amazon EBS volumes into a RAID 0 (stripe) array using the following command:
# mdadm --create ARRAYNAME --level=0 --raid-devices=8 list of all devicesFor example, to create a software RAID 0 of eight volumes:# mdadm --create /dev/md0 --level=0 --raid-devices=8 /dev/xvdf1 /dev/xvdf2 /dev/xvdf3 /dev/xvdf4 /dev/xvdf5 /dev/xvdf6 /dev/xvdf7 /dev/xvdf8 # mdadm --examine --scan > /etc/mdadm.conf - Create a Logical Volume (LV) using the following commands:
# pvcreate /dev/md0 # vgcreate glustervg /dev/md0 # vgchange -a y glustervg # lvcreate -a y -l 100%VG -n glusterlv glustervgIn these commands,glustervgis the name of the volume group andglusterlvis the name of the logical volume. Red Hat Storage uses the logical volume created over EBS RAID as a brick. For more information about logical volumes, see the Red Hat Enterprise Linux Logical Volume Manager Administration Guide. - Format the logical volume using the following command:
# mkfs.xfs -i size=512 DEVICEFor example, to format/dev/glustervg/glusterlv:# mkfs.xfs -i size=512 /dev/glustervg/glusterlv - Mount the device using the following commands:
# mkdir -p /export/glusterlv # mount /dev/glustervg/glusterlv /export/glusterlv - Using the following command, add the device to
/etc/fstabso that it mounts automatically when the system reboots:# echo "/dev/glustervg/glusterlv /export/glusterlv xfs defaults 0 2" >> /etc/fstab
After adding the EBS volumes, you can use the mount point as a brick with existing and new volumes. For more information on creating volumes, see Chapter 6, Red Hat Storage Volumes.
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