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Thread: Hard Drives

  1. #1
    Join Date
    Dec 2000
    Location
    longboat key, fl
    Posts
    508

    Question Hard Drives

    Can anyone decipher this:

    SCSI device sda: 570310656 512-byte hdwr sectors (291999 MB)
    sda: Write Protect is off
    sda: Mode Sense: 1f 00 10 08
    SCSI device sda: drive cache: write through w/ FUA
    SCSI device sda: 570310656 512-byte hdwr sectors (291999 MB)
    sda: Write Protect is off
    sda: Mode Sense: 1f 00 10 08
    SCSI device sda: drive cache: write through w/ FUA
    sd 0:2:0:0: Attached scsi disk sda
    SCSI device sdb: 488397168 512-byte hdwr sectors (250059 MB)
    sdb: Write Protect is off
    sdb: Mode Sense: 00 3a 00 00
    SCSI device sdb: drive cache: write back
    SCSI device sdb: 488397168 512-byte hdwr sectors (250059 MB)
    sdb: Write Protect is off
    sdb: Mode Sense: 00 3a 00 00
    SCSI device sdb: drive cache: write back
    sd 1:0:1:0: Attached scsi disk sdb
    sd 0:2:0:0: Attached scsi generic sg0 type 0
    sd 1:0:1:0: Attached scsi generic sg1 type 0

  2. #2
    Join Date
    Mar 2009
    Location
    Austin, TX
    Posts
    934
    What's there to decipher?

    Linux sees two SCSI HDs, one is ~300GB and second is ~250GB.

    The write cache mechanism is different on the two. sda is write through and sdb is write back. Write back usually, general speaking, is faster.
    SysAdmin.xyz
    Having severs with customer data on it without proper monitoring is like having one night stand without using protections - eventually, there will be an 'oh s**t!' moment.

  3. #3
    Join Date
    Dec 2000
    Location
    longboat key, fl
    Posts
    508
    Thanks for the reply.

    I was expecting 4X 147GB RAID 10 SAS 15000 RPM as per my order.

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