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⇤ ← Revision 6 as of 2014-04-24 23:01:22 →
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← Revision 9 as of 2016-03-10 23:34:59 → ⇥
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Editor: frank
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# dd if=/dev/zero of=/dev/sda2 bs=1M count=1000 oflag=direct
# hdparm -t --direct /dev/sda
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==== LSI MegaRaid ====
 * Default virtual drive property
  * Access RW, Read Normal, Disk Cache NoChange, I/O Cached, Disable BGI No, Default Write Write Through.
 * Maximum HDD perf
  * Raid 0, 1, 10, Read Ahead, Write Thru(for streaming sequential)/Write Back(for transactional/random) Direct IO, Disk Cache Enabled
  * Raid 5, 6, Read Ahead, Whrite Back, Direct IO, Disk Cache enabled, full initialization.
 * Maximum SSD perf
  * Raid 0, 1, 10, No Read Ahead, Write Thru, Direct IO, Disk Cache Enabled
  * Raid 5, 6, No Read Ahead, Write Back, Direct IO, Disk Cache Enabled, Full initialization

Partition UUID and Label

  • Get UUID and Label 
    # blkid
/dev/sda1: SEC_TYPE="msdos" UUID="62AC-64E2" TYPE="vfat"
/dev/sda2: UUID="ebc16f0e-586d-466e-aba5-321016b401e9" TYPE="ext4"
/dev/sda3: UUID="9bb04b5a-e6c8-48ae-b802-4084f3943945" TYPE="xfs"
/dev/sda4: UUID="439969cb-2311-40e9-b1bc-6ede1bd185ef" TYPE="swap"
/dev/sdc1: UUID="6450978C50976398" TYPE="ntfs"
/dev/sdc2: UUID="fc5d0b9e-6092-410d-b000-c567be2eb940" TYPE="ext4"
/dev/sdb1: UUID="665d6352-b050-4702-b4f0-c6242c785127" TYPE="xfs"
  • More about UUID, WWID 
    # ll /dev/disk/by-id
# ll /dev/disk/by-uuid
# ll /dev/disk/by-path

# WWID
# scsi_id -g -u -s /block/sda #for udev-095(OL5)
# scsi_id -g -u -d /dev/sda # for udev-147(OL6)
  • Change Label 
    //ext2, ext3, ext4
# e2label <device> <label name>
//ocfs2
# tunefs.ocfs2 -L <label name> <device>

I/O Performance Test

Throughput 

# dd if=/dev/zero of=/dev/sda2 bs=1G count=1 oflag=direct
# dd if=/dev/zero of=/dev/sda2 bs=1M count=1000 oflag=direct
# hdparm -t --direct /dev/sda

LSI MegaRaid

  • Default virtual drive property

    • Access RW, Read Normal, Disk Cache NoChange, I/O Cached, Disable BGI No, Default Write Write Through.

  • Maximum HDD perf
    • Raid 0, 1, 10, Read Ahead, Write Thru(for streaming sequential)/Write Back(for transactional/random) Direct IO, Disk Cache Enabled
    • Raid 5, 6, Read Ahead, Whrite Back, Direct IO, Disk Cache enabled, full initialization.
  • Maximum SSD perf
    • Raid 0, 1, 10, No Read Ahead, Write Thru, Direct IO, Disk Cache Enabled
    • Raid 5, 6, No Read Ahead, Write Back, Direct IO, Disk Cache Enabled, Full initialization

Tech/LinuxDisk (last edited 2016-03-10 23:34:59 by frank)