… MySQL instances. The original idea was to configure them with raid-10 + LVM, making sure to stripe the LV when we… data will compress much more. That gives us much more disk space than we expected so even more snapshots! Integrity With… from the other drive in the mirror. Better availability and disk usage On purpose, I allocated mirror pairs using drives from…
Comment: Virident vCache vs. FlashCache: Part 1
May 17, 2013 By 3 Comments
… massive amounts of data to disk. I could go out and buy a bunch of SSDs and RAID them together and store…-effective price point, or I might end up saturating my RAID controller such that now it becomes the bottleneck. Also, keep… speed than a regular SSD or HDD RAID), I can write data out to spinning disk at a nice sustainable rate. @Mark…
Comment: Virident vCache vs. FlashCache: Part 2
May 17, 2013 By 3 Comments
…Mark– The backing disk on this server is an 8-disk RAID 10 of fairly standard SAS drives. Your proposed test scenario …
Comment: State of the art: Galera - synchronous replication for InnoDB
April 23, 2013 By 15 Comments
… right now and don’t see the same kind of disk i/o on it that I have seen when running…-14 seconds. This is all on centos 6.4, adaptec raid controller with six 300G SAS drives in a raid10 for…
Post: Aligning IO on a hard disk RAID – the Theory
June 9, 2011 By 18 Comments
… xfs training slides: D stands for the disk here so the RAID has 4 bearing disks (spindles) and if there’s a misalignment… disk in the array. This is also one of the options you usually have to decide on very early when configuring RAID. Disk sectors Most if not all hard disk drives available on the market these days…
Post: Recovering Linux software RAID, RAID5 Array
August 27, 2011 By 2 Comments
… : 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…] [UUUUU_] So you can see RAID is active now though it is missing one of the disks, running on 5 instead of…
Post: RAID throughput on FusionIO
March 24, 2010 By 7 Comments
… maximal possible fsync/sec it is interesting how different software RAID modes affects throughput on FusionIO cards. In short conclusion, RAID10… expected RAID1 over 2 disks shows hit on write throughput comparing to single disk, but RAID10 modes over 4 disks surprises me, showing… it performs on regular hard drives or SSD disks. The performance drop in RAID settings is unexpected. I am working with Fusion…
Post: Aligning IO on a hard disk RAID – the Benchmarks
June 9, 2011 By 13 Comments
… ns) DIMM {OUT OF SPEC} Other … # Disk Schedulers And Queue Size ############################# sda | [deadline] 128 # RAID Controller ############################################ Controller | LSI Logic MegaRAID SAS Model…, BBU Present BBU | 100% Charged, Temperature 34C, isSOHGood= VirtualDev Size RAID Level Disks SpnDpth Stripe Status Cache ========== ========= ========== ===== ======= ====== ======= ========= 0(no name) 1.088…
Post: Setting up XFS on Hardware RAID -- the simple edition
December 16, 2011 By 9 Comments
… say you have a server with standard hardware RAID setup running conventional HDDs. RAID setup For the sake of simplicity you create…. We need to know two things: RAID stripe size Number of unique, utilized disks in the RAID. This turns out to be the same as the size formulas I gave above: RAID 1+0…
Comment: Server Outages at Percona
August 11, 2011 By 12 Comments
… 16 the RAID controller itself failed, which affected two more disks of the server’s RAID set. Our staff connected to the RAID BIOS utility and saw that the RAID disks were flapping between the “asserted” and “deasserted” states, which is Dell terminology for in/out of sync. Because the RAID…
