In the other article, I iniroduced hugepages and transparent hugepages, here I'm going to show you how to enable, use, monitor, and disable hugepages.Write comment (0 Comments)
blktrace is a block layer IO tracing mechanism which provides detailed information about request queue operations up to user space.Write comment (0 Comments)
I have another article discussed about conventional RAID, Compared to conventional RAID, some moden cluster file systems like GPFS™ , Ceph, gluster etc.. they use declusterd array.
Their RAID implement a sophisticated data and spare space disk layout scheme that allows for arbitrarily sized disk arrays while also reducing the overhead to clients when recovering from disk failures. To accomplish this, the cluster RAID uniformly spreads or declusters user data, redundancy information, and spare space across all the disks of a declustered array.
This article is based on IBM GPFS decluster knowledge document, I made is more general.Write comment (0 Comments)
lsblk lists information about all or the specified block devices. The lsblk command reads the sysfs filesystem to gather information.
The command prints all block devices (except RAM disks) in a tree-like format by default. Use lsblk --help to get a list of all available columns.
If you want to check block device attributes, use blkid command.Write comment (0 Comments)
DDP stands for Dynamic Disk Pooling(DDP), also known as Distribute RAID, or D-RAID. A hardware declustered array implementation. Vendor's like IBM, DELL, NetApp, EMC etc.. all support this type of array on some of their storage products.
Dynamic Disk Pooling (DDP) dynamically distributes data, spare capacity, and protection information across a pool of disk drives. DDP improves the time and performance of traditional RAID arrays.