… 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: Intel SSD 910 vs HDD RAID in tpcc-mysql benchmark
September 11, 2012 By 6 Comments
…-mysql-benchmark/. Now I want to test this card against RAID over spinning disks. Benchmark date: Sep-2012 Benchmark goal: Test….5″, 7200RPM, 16MB, SATA. Intel SSD 910 (software RAID over 2x200GB devices) Filesystem: ext4 Software OS: Ubuntu 12.04.1 MySQL Version: Percona…. Or in text form: BP sizeHDD RAIDIntel SSD 910Ratio (i910/raid) 25 GB22816207.1 50 GB55231825.76 75 GB109457295.24 So…
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 14 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…
Post: Fast storage: 8 SSD Intel X-25M 80GB benchmarks
January 18, 2010 By 15 Comments
… (software) each card connected as individual card to Adaptec, so in OS we see 8 individual cards. Card configured in software RAIDs: RAID0…, so in OS we see 2 devices. Devices connected in software RAIDs: RAID0 and RAID10 with different OS schedules over each device… some serialization in Linux software raid or Linux scheduler or on Adaptec hardware level. 2. Cards connected in hardware raids show worse results…
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: Death match! EBS versus SSD price, performance, and QoS
February 22, 2011 By 55 Comments
… in all the testing I’ve done – even for RAID 0. Hardware RAID makes assumptions about the minimum amount of time that… not necessary. I’ve tested Adaptec, LSI, 3ware, Highpoint and software RAID. Software RAID performs best for all SSD that I’ve tested, even…
Comment: FlashCache: tpcc workload with FusionIO card as cache
June 8, 2010 By 20 Comments
… drives, they tried hardware RAID, software RAID, RAID 1+0 and RAID 0), but in all cases the RAID controller or software couldn’t predict when the…
