….62 2441.07 4.93 1220.53 2.46 8.10 1.02 3.39 3.39 102.18 Device: rrqm/s….82 2570.49 9.84 1285.25 4.92 8.10 1.02 3.20 3.20 102.01 dm-0 0… 1.02 3.21 3.21 102.11 almost all time. As you see 1285 rkB/s is pretty small for RAID 10… 0.21 1091.94 3.10 8763.64 26.45 4381.82 13.22 8.03 1.02 0.94 0.93…
Post: Aligning IO on a hard disk RAID – the Benchmarks
June 9, 2011 By 11 Comments
… Report ############################## Platform | Linux Release | Ubuntu 10.04.2 LTS (lucid) Kernel…RAID Level Disks SpnDpth Stripe Status Cache ========== ========= ========== ===== ======= ====== ======= ========= 0(no name) 1.088 TB 1 (1… 15% — 909 iops unaligned -vs- 1049 aligned. Random write….
Post: RAID vs SSD vs FusionIO
May 1, 2009 By 17 Comments
… for SSD (note it is single device, in comparison to RAID 10 on 8 disks) and FusionIO are impressive, it is worth… price/performance parameter. Here is my very rough calculation: For RAID 10 we use 8 73GB SAS 2.5″ 15K RPM disks… I can get 32GB card for 390$, which is ~12.1$ per GB For FusionIO I really not sure what is…
Post: EC2/EBS single and RAID volumes IO benchmark
August 6, 2009 By 13 Comments
…www.mythtv.org/wiki/RAID) mdadm -C /dev/md0 –chunk=256 -n 4 -l 10 -p f2 /dev…–num-threads=$threads –init-rng=on \ –file-num=1 –file-extra-flags=direct –file-fsync-freq=0 run …RAID setup. RAID5 does not show benefits comparing with others, and RAID10,f2 is worse than RAID10. But speaking RAID0 vs…
Comment: Disaster: LVM Performance in Snapshot Mode
February 6, 2009 By 55 Comments
… Random Write and Random Read because of their importance: RAID 10 with LVM vs. RAID 10 only: Random Write: For small files (<16k) creation, no... chose RAID 5 + LVM for MySQL server. I chose RAID 5 instead of RAID 10 since I didn’t see much gain from RAID 10 in… from previous RAID 10 without LVM (Dell poweredge, database size 600G). We scaled out the database so the new database is 1/3…
Post: Pretending to fix broken group commit
February 2, 2009 By 11 Comments
… and still not fixed in MySQLÂ 5.0/5.1 (and most likely will not be in MySQLÂ…-group-commit mode. There are results with this options vs without (results are in transactions per second, more is… load). I tested it on Dell PowerEdge R900 with RAID 10 in WriteThrough mode to emulate absence of BBU. With…
Post: How multiple disks can benefit for single client workload ?
April 26, 2008 By 4 Comments
… topic of the article lets comment on IO vs Disk question. If you look at Disk Based …hard drives to pick reading any block. RAID controller (and even software RAID driver) typically tracks disk head position … on 1TB hard drive you will have 10 seeks condensed in 1/10 of the full seek distance. I …
Post: FusionIO - time for benchmarks
December 8, 2009 By 10 Comments
I posted about FusionIO couple times RAID vs SSD vs FusionIO and Testing FusionIO: strict_sync is too strict…. The … threads it is already 0.85ms, and for 16 threads – 1.55ms (which is still very good). And something happens with… we have more than 1 working thread, and we can see only 130MB/sec max throughput. Write bandwidth vs filesize: So there…
Post: How much overhead DRDB could cause ?
June 2, 2008 By 4 Comments
…0 and it is still not fixed in 5.1 to date. So this is the access pattern …re speaking about 300 microseconds vs 5000 microseconds and DRBD overhead can be well below 10% The problem is …have BBU (Battery backed up unit) on your hardware RAID card or something which has same effect, especially as…
Post: Heikki Tuuri Innodb answers - Part I
October 26, 2007 By 17 Comments
…3x performance boost and it would write at 100MBps vs 33MBps. Any plans to enable tuning of the …pool it well may be faster to do 1 write than flush 10 non sequential pages from it which were…commit being broken. Most do not have RAID with BBU. With good RAID with BBU you can get 2000 fsync…
