…), which can be connected together via software RAID. So I tested in two modes: single drive, and software RAID-0 over two drives. I… 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
… IO configuration I chose 8 x 200G EBS volumes in software RAID 10. Now let’s come to the MySQL configuration. MySQL…
Comment: Review of Virident FlashMAX MLC cards
April 25, 2012 By 14 Comments
… issue applies to any RAID-0 volume regardless of hardware or software platform. If even one drive in a RAID-0 stripe set… from a RAID-0 and ignore the incomplete stripe, but that is my experience with Windows software Raid-0. Maybe some raid-0 is…
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: fsyncs on software raid on FusionIO
March 23, 2010 By 6 Comments
… relies on OS tools there. So for Linux we have software RAID and LVM, I tried to followup on my post How… LVM on cards, so I’ve finished tests only for software RAID0 and RAID1. I used XFS filesystem mounted with “-o… files with innodb_flush_log_at_trx_commit=1 on software RAID1 over FusionIO. For reference I used command: sysbench –test…
Post: RAID and Scale Out Discussions
June 12, 2007 By 3 Comments
… about death of the RAID. I think this is far from the case especially if you consider Software RAID here. For many workloads you would like to get RAID just for the sake of BBU. As Jeremy mentioned RAID is… for search index because it is far faster than using software RAID. But this is only because Sphinx allows using highly parallel…
Post: Recovering Linux software RAID, RAID5 Array
August 27, 2011 By 2 Comments
… of client lacking the proper backup or sometimes because recovering RAID might improve recovery, for example you might get point in… : Fri Aug 26 13:51:11 2011 Raid Level : raid5 Used Dev Size : -1 Raid Devices : 6 Total Devices : 5 Persistence : Superblock… Creation Time : Fri Aug 26 13:51:11 2011 Raid Level : raid5 Raid Devices : 6 Avail Dev Size : 5851089777 (2790.02 GiB…
Post: EC2/EBS single and RAID volumes IO benchmark
August 6, 2009 By 13 Comments
… as device in your OS, so you can easily make software RAID from several volumes. So I created 4 volumes ( I used… steps: mdadm -v –create /dev/md0 –chunk=256 –level=raid1 –raid-devices=2 /dev/sdj /dev/sdk mdadm -v –create /dev… EC2/EBS environment it’s definitely worth to consider some RAID setup. RAID5 does not show benefits comparing with others, and…
Post: RAID throughput on FusionIO
March 24, 2010 By 7 Comments
… with maximal possible fsync/sec it is interesting how different software RAID modes affects throughput on FusionIO cards. In short conclusion, RAID10… mode with n2 layout Latest mode you can get creating RAID as: mdadm –create –verbose /dev/md0 –level=10 –layout=n2… regular hard drives or SSD disks. The performance drop in RAID settings is unexpected. I am working with Fusion-io engineers…
