… (1.2TB each), which can be connected together via software RAID. So I tested in two modes: single drive, and software RAID-0 over two drives. I should note that to run … graph I show the results for both single card and raid (Duo). Random writes, async: We see stable and predictable write…
Comment: Testing Intel SSD 520
May 2, 2012 By 7 Comments
Curious .. how are people deploying these SSDs on DB servers? Are they behind a regular raid controller? Or using software RAID? Or simply straight up direct /dev/sdx? AD
Post: Benchmarking single-row insert performance on Amazon EC2
May 16, 2012 By 11 Comments
… configuration I chose 8 x 200G EBS volumes in software RAID 10. Now let’s come to the MySQL configuration. MySQL…
Comment: ext4 vs xfs on SSD
May 3, 2012 By 23 Comments
… of allocation groups, setting the correct sunit/swidth for the RAID array, or using nobarrier, all have no statistically significant impact…
Comment: FlashCache: first experiments
May 3, 2012 By 18 Comments
… files layout: ibdata1 and ib_logfile* are placed on separate RAID partition ( not on FlashCache or SSD)” Why did you exclude…
Comment: Testing Intel SSD 520
May 2, 2012 By 7 Comments
AD, Most usage is behind a regular raid controller. LSI 9211, LSI 9260, Dell Perc H800 are popular ones for this case.
Comment: Review of Virident FlashMAX MLC cards
April 25, 2012 By 14 Comments
… Platform, not Linux. I think this issue applies to any RAID-0 volume regardless of hardware or software platform. If even one drive in a RAID-0 stripe set is unable to write its portion of…, but that is my experience with Windows software Raid-0. Maybe some raid-0 is smart enough to ignore an incomplete stripe…
Comment: Review of Virident FlashMAX MLC cards
April 24, 2012 By 14 Comments
… is a problem including a driver failure, the caveat on RAID-0 is that you end up with a corrupt volume…, even with the protections on the card with parity etc, RAID-0 is not safe because driver errors do occasionally happen… ever lose data. A failure to complete a write on RAID-0 corrupts the volume, even if no prior data was…
Comment: Review of Virident FlashMAX MLC cards
April 25, 2012 By 14 Comments
Bob, That’s good information. I am always somewhat hesitant about linux software raid. Even Linux is incredible popular, it feels it is still not mature enough in many areas, including IO.
Post: Percona Toolkit 2.1 with New Online Schema Change Tool
April 5, 2012 By 9 Comments
… these tools rapidly, for example, to support new types of RAID controllers. Percona Toolkit is a hot topic at the upcoming…
