……. rebuild failed bringing all logical drive down because yet another hard drive got bad block. Replaced hard drive was “failed” because it could… consistency check before replacing hard drive with predicted failure to minimize chance of double drive failure in RAID. It is good to run… reminds about: Do not assume RAID is Reliable. RAID is more reliable than plain disk, RAID6 is more reliable than RAID5 but all they can…
Post: Rendundant Array of Inexpensive Servers
August 21, 2008 By 15 Comments
… attacks and other issues. However as your system growths the reliability goes down. If you have 100 servers with each failing… of hot spare. The RAID is just dramatically reduces chance of data loss in case of hard drive failure and this is… availability – if you have proper RAID monitoring in place and keep couple of spare hard drives on the shelf in the data…
Post: Is disk Everything for MySQL Performance ?
April 25, 2008 By 7 Comments
… along you need enough concurrency to utilize multiple hard drives and with 50 drives you would need at least 50 outstanding requests… BBU on the raid volume impact on transactional log write speed is usually minimal. At the same time if reliability is desired… data RAID volume was trashed. Regarding SWAP – I tend to have it but not optimize for it, putting it on shared drive…
Post: When would you use SAN with MySQL ?
March 9, 2009 By 18 Comments
… speaking about purely disk based SAN (no Flash) the drives are same drives you will see in directly attached storage and each… prices per drive. The next possible advantage is software – can SAN have some very smart software instead of simple RAID you use… it is more reliable, same as server with multiple power supplies ECC memory kill-chip and RAID is more reliable than without these…
Post: Fast storage: 8 SSD Intel X-25M 80GB benchmarks
January 18, 2010 By 15 Comments
… my opinion SSD cards are not reached enough level of reliability yet (see comments to post FusionIO 320GB MLC benchmarks), however….g. like I put InnoDB transactional logs on rotation based drives instead of SSD in my InnoDB on FusionIO benchmarks). So… 8 SSD drives may be significant. You may want to look into different options: connect them in software or hardware raids, what…
Comment: Tokyo Tyrant - The Extras Part I : Is it Durable?
August 20, 2010 By 5 Comments
… often tuned accordingly. Another trick is the appropriate use of RAID. RAID5 brings write CRC overhead (pure striping RAID0 doesn’t… 3x) overhead in terms of disk usage, if it’s reliability & speed you want then hardware to the rescue…. As for… reliable than SCSI b/c SSA runs on a loop. There’s less I/O contention for starters & a failed drive on…
Comment: FusionIO 320GB MLC benchmarks
January 12, 2010 By 19 Comments
…able to read the data off them. But agreed, > RAID 0 if great for benchmarking but not for …two weeks of one another, in different systems. Neither drive even shows up on the SATA bus when …II connector. I’ve honestly had serious performance or reliability issues with almost every SSD device I’ve …
Comment: FusionIO 320GB MLC benchmarks
January 12, 2010 By 19 Comments
… production environment you would most likely keep it RAID-5 (reliability) or RAID-10 (performance/reliability). Doing the quick math on cost for parts…) ran with a RAID10 and RAID5 configuration with the Intel drives and dual Adaptec cards. Both solutions are expensive, it would…
Post: SSD, XFS, LVM, fsync, write cache, barrier and lost transactions
March 2, 2009 By 32 Comments
…finally managed to get Intel X25-E SSD drive into our lab. I attached it to our Dell … publish some nice benchmarks where InnoDB on SSD outperforms RAID 10, but recently I faced issue which can make…So in final conclusion: 1. Intel SSD X25E is NOT reliable in default mode 2. To have durability we need…
Comment: FusionIO 320GB MLC benchmarks
January 12, 2010 By 19 Comments
… reliable than traditional disks; even if they ‘break’ you’d still be able to read the data off them. But agreed, RAID 0 if great for benchmarking but not for a production database 2. It’s only 2 cards and 8 drives; the…
