1
vote
0answers
153 views

Sizing of journal disks with Microsoft Storage Spaces parity volume

I'm currently speccing out a new backup server. It's going to be running Windows Server 2012 R2 with Direct Attached Storage, and I'm considering using Storage Spaces rather than using a RAID card. ...
0
votes
0answers
58 views

RAID6 Ubuntu rebuild - how to calculate best parameters for fastest rebuild

I am doing a resync on a RAID6 array and I am looking at some 2 days to complete. I looked here for hints on how to speed it up, but I have, instead, managed to slow it down! HW details are: 10x 4TB ...
1
vote
1answer
437 views

Various problems with software raid1 array built with Samsung 840 Pro SSDs

I am bringing to ServerFault a problem that is tormenting me for 6+ months. I have a CentOS 6 (64bit) server with an md software raid-1 array with 2 x Samsung 840 Pro SSDs (512GB). Problems: ...
1
vote
1answer
1k views

Linux RAID5 Optimal Chunk Size

I bring up, yet again, the ever-present question of how to best optimize disk structures. In my organization, we have a 14TB Linux software RAID array dedicated to storing backups made using Symantec ...
3
votes
1answer
2k views

Linux file system cache: Move data from Dirty to Writeback

My software RAID can write 800 MB/s sustained. I see that happening when cat /proc/meminfo |grep Writeback: returns > 2 GB. However, most of the time the writeback is round 0.5 GB which gives a ...
5
votes
2answers
497 views

Linux software RAID6: rebuild slow

I am trying to find the bottleneck in the rebuilding of a software raid6. ## Pause rebuilding when measuring raw I/O performance # echo 1 > /proc/sys/dev/raid/speed_limit_min # echo 1 > ...
2
votes
3answers
281 views

Analysing Disk IO Traffic

I am running a web server (Ubuntu 11.04) that exhibits unexpected high write traffic. When the server is not supposed to write at all, the amount of write traffic is comparable to the read traffic. ...
2
votes
0answers
410 views

MySQL INSERT … SELECT renders server unresponsive

Solution: Although I haven't found a proper solution yet I'm at least sure that this is purely a disk I/O problem and has nothing to do with MySQL... I have a MySQL server (5.1.54-1ubuntu4-log) ...
0
votes
2answers
693 views

How to remove swap partitions from RAID 1 Array on Ubuntu?

Can anyone point in the right direction on how to remove SWAP out of a RAID1 configuration on Ubuntu 10.04 server? According to the Ubuntu Advanced installation guide, here, it said to add swap to the ...
2
votes
1answer
278 views

FreeBSD vinum striped (RAID0) volume - performance issues

I've experimented with different striped volumes in vinum under FreeBSD 8.2-release. I have current hardware (Intel i5 processor, adequate MB and 8GB RAM). My test-setup consists of 2 or 4 disks in a ...
0
votes
2answers
916 views

md-RAID5 - How fast should it be or where is the bottleneck?

I set up a new server with a LUKS encrypted RAID5. On the former server, the bottleneck was definitely the CPU, as it was a 7y old single core and the load went up to 100%. Now it is different. I ...
1
vote
2answers
1k views

Software RAID 5 vs RAID 6 performance

I had an original software RAID 5 setup under Ubuntu 10.04.03, 3 devices, 64k chunk. Performance was acceptable: # 4GB write dd if=/dev/zero of=ddfile.big bs=1MB count=4k 4095290816 bytes (4.1 GB) ...
5
votes
3answers
6k views

mkfs Operation Takes Very Long on Linux Software Raid 5

I've set-up a Linux software raid level 5 consisting of 4 * 2 TB disks. The disk array was created with a 64k stripe size and no other configuration parameters. After the initial rebuild I tried to ...
2
votes
3answers
2k views

Poor software raid10 read performance on Linux

I've recently set up new Linux based file server. The distribution I'm using is Ubuntu 10.10. I've created two software raid devices as follows: mc@vmr:~$ cat /proc/mdstat Personalities : [linear] ...
2
votes
2answers
751 views

Raid rebuild performance impact

I am wondering whether the raid rebuild process will impact the system performance significantly or not. Will the server be able to respond with a reasonable delay during the rebuild process? Another ...
1
vote
9answers
4k views

Windows Software RAID-0 or 1 as speedup of a developer workstation?

Would it help to speed up a developer workstation to put in a second drive and set up a windows software RAID-1 or RAID-0 (i.e. disk mirroring / striping)? In theory the system could distribute it's ...