All Questions
7
questions
1
vote
0
answers
341
views
ZFS I/O Error, Kernel Panic during import
I'm running a raidz1-0 (RAID5) setup with 4 data 2TB SSDs.
During midnight, somehow 2 of my data disks experience some I/O error (from /var/log/messages).
When I investigated in the morning, the zpool ...
0
votes
1
answer
388
views
Is JBOD or striping better for lots of small files?
I have a server in multi-disk configuration using LVM-on-LUKS in JBOD mode. But I notice in htop that the kernel time in CPU usage is (un)usually very high, and in iotop the jbd2/dm-5-8 and ...
- 28.4k
0
votes
1
answer
3k
views
How does Raid 0 improve read performance?
Let's suppose we have 2 hard disks and stripe unit size is 64 kb.
While doing random read with size 4KB how Raid 0 affects performance?
I mean if we are doing random reads wouldn't operating system ...
- 418
0
votes
0
answers
922
views
VirtualBox - high performance I/O tuning - is it possible?
I'm running workstation that heavily relies on virtualization. I chose VirtualBox because:
unlike VMWare it's free and much more portable and maintenance-free (no need to troubleshoot issues with ...
- 820
7
votes
1
answer
3k
views
Fail device in md RAID when ATA stops responding
I had created five 1TB HDD partitions (/dev/sda1, /dev/sdb1, /dev/sdc1, /dev/sde1, and /dev/sdf1) in a RAID 6 array called /dev/md0 using mdadm on Ubuntu 14.04 LTS Trusty Tahr.
The command sudo mdadm ...
- 19.7k
2
votes
1
answer
16k
views
How much slower is a RAID 1 hard drive compared to no RAID?
How much slower is RAID 1 than no RAID at all? I have heard that RAID 1 provides peace of mind (because of mirroring) but gives slower write (not read) performance.
- 736
1
vote
0
answers
91
views
Maintaining peak IO potential with DD / CP
I wanted to copy a file (40 gig dataset) from a single drive to a dual disk raid-0 drive. I tried with CP and it sustained read - 4mb and write - 11 mb (doesn't make sense I know (must be the stripe ...
- 200