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| − | Storage benchmarking and tuning depends upon several parameters like file systems, kernel parameters, RAID configuration, network parameters, etc. This page aims to provide benchmarking tools and procedures for LCG Storage Element, as well as some tuning hints for particular hardware solutions. | + | = Storage Benchmarking = |
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| − | = Benchmarking =
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| − | = Tuning =
| + | Storage benchmarking and [[TCP-Tuning|tuning]] depends upon several parameters like file systems, kernel parameters, RAID configuration, network parameters, etc. This page aims to provide benchmarking tools and procedures for LCG Storage Element, as well as some results for particular hardware solutions. |
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| − | == DELL Systems == | + | == Tools == |
| − | === R510 + PowerVault MD1200 ===
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| − | *RAID avec stripe size de 1m et règle « lecture anticipée adaptative »
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| − | *FS xfs avec alignement des partitions et montage avec l'option "noatime"
| + | == Procedures == |
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| − | Exemple:
| + | == Results == |
| − | #parted /dev/sdb mklabel gpt
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| − | #parted /dev/sdb mkpart primary xfs 1m 50%
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| − | #parted /dev/sdb mkpart primary xfs 50% 100%
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| − | #######
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| − | mkfs.xfs -d su=1m,sw=10 /dev/sdb1 -L R510_sdb1
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| − | mkfs.xfs -d su=1m,sw=10 /dev/sdb2 -L R510_sdb2
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| − | #######
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| − | # cat /etc/fstab | grep noatime
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| − | LABEL=R510_sdb1 /fs1 xfs defaults,noatime 0 0
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| − | LABEL=R510_sdb2 /fs2 xfs defaults,noatime 0 0
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| − | *kernel:
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| − | **Utilisation du Read ahead system
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| − | **modif du scheduleur par défaut et du nombre de requete en queue
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| − | # tail -6 /etc/rc.d/rc.local
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| − | blockdev --setra 16384 /dev/sdb
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| − | blockdev --setra 16384 /dev/sdc
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| − | echo 512 > /sys/block/sdb/queue/nr_requests
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| − | echo 512 > /sys/block/sdc/queue/nr_requests
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| − | echo deadline > /sys/block/sdb/queue/scheduler
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| − | echo deadline > /sys/block/sdc/queue/scheduler
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| − | == HP Systems ==
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| − | === MDS 600 based system ===
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| − | In order to enhance the performance of the MDS 600 based systems, the following tunings have been applied:
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| − | * Upgrading the hard disk firmware (HPD3). All hard disks should have the same firmware version.
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| − | * Changing the power management profile (max cpu power).
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| − | * Using the following system parameters for each disk:
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| − | <pre>
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| − | echo "cfq" > /sys/block/cciss\!${disk}/queue/scheduler
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| − | echo 256 > /sys/block/cciss\!${disk}/queue/nr_requests
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| − | echo 4096 > /sys/block/cciss\!${disk}/queue/read_ahead_kb
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| − | </pre>
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| − | * Using XFS filesystem aligned with the RAID strip
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| − | * Using RAID units composed of 5 disks wisely selected on different columns.
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