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Running an ext4 RAID0 with a Linux 4.x Kernel? Better Spray for Bugs

posted by janrinok on Tuesday May 26 2015, @04:16PM   Printer-friendly
from the patch-immediately dept.

"gewg_" writes:

The combination of RAID0 redundancy, an ext4 filesystem, a Linux 4.x kernel, and either Debian Linux or Arch Linux has been associated with data corruption.

El Reg reports EXT4 filesystem can EAT ALL YOUR DATA

Fixes are available, one explained by Lukas Czerner on the Linux Kernel Mailing List. That post suggests the bug is long-standing, possibly as far back as the 3.12-stable kernel. Others suggest the bug has only manifested in Linux 4.x.

[...] This patch for version 4.x and the patched Linux kernel 3.12.43 LTS both seem like sensible code to contemplate.

[Editor's Comment: Original Submission]

 
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  • (Score: 2) by slinches on Wednesday May 27 2015, @06:29AM

    by slinches (5049) on Wednesday May 27 2015, @06:29AM (#188487)

    I just configured a new FEA workstation with a RAID0 array of 10k rpm SAS drives. It's actually being used as the primary active data drive, but the configuration was selected to be an effective working directory for analysis runs. Some of these runs can require several terabytes of I/O with results sets in the hundreds of gigabytes, so high capacity and speed are paramount. Redundancy is then handled by running daily scripted rsync operations to regular SATA drives.

    This setup becomes roughly equivalent to RAID10 in terms of data security except that it's asynchronous, so a drive failure could cause the loss of some recent data. The benefit of accepting that risk is reduced cost, increased usable space and better write performance relative to RAID10 with same number of disks.

    For example:
    8x 1TB SAS 10k rpm drives in a RAID10 array gives 4TB of space with 8x read and 4x write speeds (cost $400 x 8 = $3200)
    6x 1TB SAS 10k rpm drives in RAID0 gives 6TB of space with 6x read and write speeds + 2x 3TB SATA drives (cost $400 x 6 + $150 x 2 = $2700)

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