Dell PowerEdge EL Manual

Also see for PowerEdge M420: Manual Command reference guide Owner's manual Administrator's guide Information update

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Dell PowerEdge EL Manual Manual pdf 33 page image

Improving NFS Performance on HPC Clusters with Dell Fluid Cache for DAS33Stripe Element Size : 512 KBDisk Cache Policy : DisabledA.5. XFS and DFC configurationIn this final step of the configuration on the server, the XFS file system is created, DFC is configured,and the storage exported to the I/O clients via NFS.1. Create the XFS file system on the RAID 60 virtual disk attached to the PERC H810 adapter. Note thestripe unit (su) and stripe width (sw). The stripe unit is the stripe element size that was used toformat the virtual disk in step 3, Section A.4. The stripe width is the number of data drives in thevirtual disk. This solution uses 48 disks, a RAID 6 configuration with a spanlength of 12 (10 datadisks and 2 parity disks) and that results in a total of 40 data disks.[root@nfs-dfc ~]# mkfs.xfs -d su=512k,sw=40 -l size=128m /dev/sdc2. Set up the cache pool for Dell Fluid Cache.Verify that the DFC service is running.[root@nfs-dfc ~]# service fluid_cache statusAdd two SSDs to the cache pool and check the status.[root@nfs-dfc ~]# fldc --add --ssd=/dev/rssda -v[root@nfs-dfc ~]# fldc --add --ssd=/dev/rssdb –v[root@nfs-dfc ~]# fldc -v --list --ssdEnable caching on the RAID 60 external virtual disk. Note the device and the mode for caching(write-back in the command below).[root@nfs-dfc ~]# fldc --enable --disk=/dev/sdc --mode=wbAt this point, DFC will create a new device called /dev/fldc0 that includes the cache pool andthe virtual disk.Check the DFC status[root@nfs-dfc ~]# fldc --status3. Mount the file system. Note the device mounted is /dev/fldc0[root@nfs-dfc ~]# mount -onoatime,allocsize=1g,nobarrier,inode64,logbsize=262144,attr2 /dev/fldc0/home/xfs/4. Export this file system over NFS by modifying /etc/exports. Note that the share is exported withthe ‘sync’ option.[root@nfs-dfc ~]# cat /etc/exports/home/xfs *(rw,no_root_squash,sync)5. Restart the NFS service. Now the clients can mount the NFS share over the ib0 interface. Note thatthis solution recommends NFS v3 based on the results of a previous study.[root@nfs-dfc ~]# service nfs restart