…), which can be connected together via software RAID. So I tested in two modes: single drive, and software RAID-0 over two drives. I… kit”. So you need to make sure you have compatible hardware before getting Duo card. I personally ended up with setup… graph I show the results for both single card and raid (Duo). Random writes, async: We see stable and predictable write…
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 is… from a RAID-0 and ignore the incomplete stripe, but that is my experience with Windows software Raid-0. Maybe some raid-0 is…
Post: Recovering Linux software RAID, RAID5 Array
August 27, 2011 By 2 Comments
… you no access to the data at all. Not all Hardware RAID would have this behavior. First lets see what the status… : 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…
Comment: FlashCache: tpcc workload with FusionIO card as cache
June 8, 2010 By 20 Comments
… 4 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… for redundancy and stripping FIO cards, outside of a few hardware failures on the cards in early manufacturing, and the driver…
Post: Fast storage: 8 SSD Intel X-25M 80GB benchmarks
January 18, 2010 By 15 Comments
…. Card configured in software RAIDs: RAID0, RAID10, RAID5, RAID50 In second round (marked as hardware) each Adaptec is configured as hardware RAID0 over 4… there some serialization in Linux software raid or Linux scheduler or on Adaptec hardware level. 2. Cards connected in hardware raids show worse results than…
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… commodity hardware and really smart people, while in most cases tasks have to be solved with commodity hardware and commodity people. RAID can…
Comment: RAID and Scale Out Discussions
June 12, 2007 By 3 Comments
… that I think software RAID is an symptom of RAIDs death…. It’s a nail in the coffin. We use software RAID but there are… think to many considerations are being made thinking about commodity hardware and really smart people, while in most cases tasks have… think the death will be 3-5 years out. The software infrastructure needs to become stable enough so that commodity people…
Post: Small things are better
October 8, 2006 By 15 Comments
… piece of hardware or software can fail, even if this piece of hardware has some internal redundancy by itself, such as RAID or SAN…. Smaller RAID volumes would typically rebuild faster, smaller database size per system (yet another reason to like medium end commodity hardware) makes…
Comment: Death match! EBS versus SSD price, performance, and QoS
February 22, 2011 By 54 Comments
… SSD to traditional RAID controllers is a bad idea in all the testing I’ve done – even for RAID 0. Hardware RAID makes assumptions… not necessary. I’ve tested Adaptec, LSI, 3ware, Highpoint and software RAID. Software RAID performs best for all SSD that I’ve tested, even…
Post: How reliable RAID really is
June 30, 2006 By 11 Comments
… it is much better than loosing everything. Unfortunately neither RAID BIOS nor RAID tools do not provide you with such feature. Happily… few things this case reminds about: Do not assume RAID is Reliable. RAID is more reliable than plain disk, RAID6 is more… software bugs and user errors which are other reasons why you want backups. Do not trust to any single piece of hardware…
