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| This is a WIP
| | #REDIRECT [[Linux iSCSI Target (TCM)]] |
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| == Introduction ==
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| This HOW-TO is focusing on performance. This is why I made some decisions targeted on performance instead of security (like you are used in Alpine Linux).
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| This means we are not using grsec and not using a firewall. I presume you will take security actions on another level.
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| == Content ==
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| * Vanilla Kernel with SCST patches (linux-scst)
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| * SCST modules and SCST ISCSI modules (linux-scst)
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| * Linux software raid and raid level (mdadm)
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| * Volume Management (LVM2)
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| * SCST administration (scstadmin)
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| * Linux raid monitoring
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| == Linux software raid ==
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| In my personal setup i have 4 pieces of WD RE4 1TB drives which i want to use in the best performance raid level with redundancy.
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| According to many mailing lists and opinion of the Linux raid author raid 10 seems to preform best while still having redundancy.
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| You will loose 50% of your data storage but you will almost the same performance of RAID0 and redundancy of raid1.
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| For most up-to-date information regarding Linux software raid: https://raid.wiki.kernel.org/index.php/Overview
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| Raid10 level has multiple layout types. f(far)2 in tests seem to preform the best. Please see above link for references.
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| mdadm -v --create /dev/md0 --level=raid10 --layout=f2 --raid-devices=4 /dev/sda /dev/sdb /dev/sdc /dev/sdd
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| I am not using partitions on my disks, although there are reasons to use partitions, see here:
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| https://raid.wiki.kernel.org/index.php/Partition_Types
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| You can now monitor your raid (re)building: cat /proc/mdstat
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| Default the rebuild speed will be set and can be checked and changed here:
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| cat /proc/sys/dev/raid/speed_limit_max
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| cat /proc/sys/dev/raid/speed_limit_min
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