Ok first off the write speeds are off the hook, 210MB/s on 5400RMS disks (5 disks in a RAID 6). However, read speeds are 68MB/s. I wondering first off, why? and secondly could this be an indicator of something not properly setup that might cause harm to my disks?
View 5 RepliesI was analyzing the Disk read using hdparm utility. This is what i got as a result.
Code:
# hdparm -t /dev/sda
/dev/sda:
Timing buffered disk reads: 108 MB in 3.04 seconds = 35.51 MB/sec
Code:
# hdparm -T /dev/sda
/dev/sda:
Timing cached reads: 3496 MB in 1.99 seconds = 1756.56 MB/sec I m not sure what does Cache read and buffered disk read mean.
I am running lucid and have a 4+1(spare) RAID5 array made up of 1TB disks. I upgraded my mdadm to version 3.1.4 and then performed the following operation:
$sudo mdadm --grow /dev/md3 --level=6 --read-device=5 --backup-file=/var/lib/mysql/md3backup
I have a 500GB drive mounted at /var/lib/mysql which is mostly empty and not part of any RAID array.The reshaping started and everything looked OK. The access lights on the 5 drives were all coming on at the same time on a regular basis. The status from /proc/mdstat showed the array being reshaped to RAID6, albeit slowly. The status showed an average speed of 4000KB and an estimated completion time of 4000 minutes. This all seemed reasonable. This was performed in late afternoon.
The next morning I checked the status and the average speed was down to 300->400KB and the estimated time to complete was 40,000 minutes. When I look at the drive lights, I have one drive whose access light is on solid and the other four drives come on intermittently. Running iotop doesn't show anything useful. mdadm and kjournal show up occasionally. The same is true for top (running on an i5 2500K Intel processor). Here is the output of cat /proc/mdstat:
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md2 : active raid1 sde3[4](S) sda3[3] sdc3[1] sdd3[2] sdb3[0]
987904 blocks [4/4] [UUUU]
[code]....
My biggest concern is keeping this system running for 20+ days without any hiccups.
I have a 12 disk raid 6 Array with 2 additional spare drives. Two of the drives got out of sync (because I was fat fingering the mdadm commands while trying to reassemble the array), so I added them back as spares. This is what mdadm is showing me:
[Code]...
I have an 8x1TB raid6 array that I finally got back to a good state (see my other post here: [URL]..This is on a 9.04 server Now I can assemble the array no problem, but mounting is the issue. I think the reason might be because the array order changed. In the process of recovering I removed the /dev/md0 array and created a new array. In the create array command it told me:
Code:
mdadm: /dev/sdb1 appears to be part of a raid array: for each device in the array. I confirmed that I wanted to continue and the array was recreated. I think this overwrote the superblock, but I'm not sure.
After the sync I tried to mount the array using:
[Code]...
Note: This how-to assumes you are using LVM on top of the RAID5
Example scenario:
VG0 <-> md0 = RAID5(3x500GB) = sda1, sdb1, sdc1
Volume Group VG0 is made up of a single Physical Volume (md0), which is made up of 3x500GB hard drives in
[code]....
I installed 10.04 on a new machine and 'tried' to create a 4 disk RAID6 array on four new 4TB drives.The build seemed to go fine, but a check on the new dev shows the following:
/dev/md0:
Version : 00.90
Creation Time : Sun May 30 21:53:11 2010
[code]....
Code:
$cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
[code]....
1/4 of my drives died after about 3 years of usage. I replaced it with an identical drive and did a mdadm -add to re-add it to the array. I expected this to take quite a long time, but not more than 1 million minutes to complete!
I'm running debian and used mdadm to setup up a raid 6 array with 4x1TB drives with roughly 1.86TB's available with lvm. Then I added 4x1TB drives to the array. So now I have an 8 drive raid 6 array with 5.+TB's available, the array sees all available space. The question is how do I extend the volume group so that it uses the whole raid and not just half of it. As of right now the volume group is only 1.86TB's.
View 6 Replies View RelatedI've been playing with this for hours, and have been unable to figure it out. I tried to convert my RAID5 array of 4 active disks and 1 spare to a RAID6 with 5 active disks.
I did this:
Code:
mdadm --grow /dev/md4 --raid-devices 5 --level 6
Here is what I have on /dev/md4:
Code:
/dev/sde1 active
/dev/sdg1 active
/dev/sdj1 active
/dev/sdf1 active
removed
/dev/sdh5 spare
code....
but it tells me that /dev/sde is busy, and then that it has a bad superblock (From what I've read, I'm sure the bad superblock is just because of the "busy" message). I've tried this with the -f option, too, with no luck.
I am currently having problems with my RAID partition. First two disks were having trouble (sde, sdf). Through smartctl I noticed there were some bad blocks, so first I set them to fail, and readded them so that the RAID array will overwrite these. Since that didn't work, I went ahead and replaced the disks. The recovery process was slow and I left things running overnight. This morning I find out that another disk (sdb) has failed. Strangely enough the array has not become inactive.
md3 : active raid6 sdf1[15](S) sde1[16](S) sdak1[10] sdj1[8] sdk1[9] sdb1[17](F) sdan1[13] sdd1[2] sdc1[1] sdg1[5] sdi1[7] sdal1[11] sdam1[12] sdao1[14] sdh1[6]
25395655168 blocks level 6, 64k chunk, algorithm 2 [15/12] [_UU__UUUUUUUUUU]
Does anyone have any recommendations as the steps to take ahead with regards to recovery/fixing the problem? The disk is basically full so I haven't written anything to disk in the interim of this problem.
For backup purposes, I built a RAID6 array on USB. When during the night the backup filesystem is being mounted, every so many days, a random disk fails:
Code: sd 9:0:0:0: [sdb] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
sd 9:0:0:0: [sdb] Sense Key : Illegal Request [current]
sd 9:0:0:0: [sdb] Add. Sense: Invalid field in cdb[code].....
In other words, my RAID set fails every so many mounts, but I know how to fix it.What I want to find out is:
- Why is a random drive failed every now and then?
- How can I prevent that drive from being failed?
BTW: I have a second RAID set that has been functioning for years without error, so the setup I use must be correct. The only difference between both RAID arrays is the different vendor of the disks.
As per [URL] I built a RAID6 array. yay. In the end it completed.
Code:
fermulator@fermmy-server:~$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md2000 : active raid6 sdo1[3] sdn1[2] sdm1[1] sdl1[0]
3907026944 blocks level 6, 64k chunk, algorithm 2 [4/4] [UUUU]
To test stability, I rebooted the system, but on reboot, the array wasn't assembled correctly. Basically it had one device in "md_d2000", as a spare. So I stopped that device with
Code:
sudo mdadm --stop /dev/md_d2000
The superblocks looked good ...
Code:
fermulator@fermmy-server:~$ sudo mdadm -E /dev/sd[lmno]
/dev/sdl:
Magic : a92b4efc
Version : 00.90.00
[code]...
I don't have any important data on the array yet ... so I zero'd the superblocks on all devices, deleted the partitions, and started over .. here I go again:
Code:
md2000 : active raid6 sdo1[3] sdn1[2] sdm1[1] sdl1[0]
3907026944 blocks level 6, 64k chunk, algorithm 2 [4/4] [UUUU]
[>....................] resync = 0.7% (14164844/1953513472) finish=313.7min speed=102999K/sec
I'm having issue with raid6. I already created a thread in the "Linux -General" forum, but it seems, there is no right audience
[URL]
I'm having little problem trying to change weather to USA it reads C instead of F on conky forecast here is screenshot.
View 7 Replies View RelatedMy ubuntu started out right, it copies files 3/4 of the way through and reads ready when you areThe foward button does not let me click it
View 1 Replies View RelatedI used to have audio working. Now it's silence while the vumeter reads as if all streams are outputting okay. I have a Radeon HD 4670 with audio out the HDMI as well as audio out the motherboard simultaneously. This all works in windows 7 and used to work in ubuntu until some point, not exactly sure when, it all went silent. Also, fyi, I started with a clean 9.10 and upgraded to 10.04.
# uname -a
Linux turk-desktop 2.6.32-24-generic #39-Ubuntu SMP Wed Jul 28 05:14:15 UTC 2010 x86_64 GNU/Linux
# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC888 Analog [ALC888 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 1: ALC888 Digital [ALC888 Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: HDMI [HDA ATI HDMI], device 3: ATI HDMI [ATI HDMI]
Subdevices: 1/1
Subdevice #0: subdevice #0
Due to crash of 10.04 grub, I installed it again from a live CD on D drive "C drive has windows 7", then immediately after install, I upgraded to 10.10 64 bit. Need to change the boot to Windows loader and not directly to Ubuntu as it happens now. I see "windows loader as an alternative option" and it works when I select it. when I boot to windows, my computer icon reads only one file on D drive "bootsqm.dat". from Ubuntu computer option, I can access all windows files.
View 3 Replies View Relatedi'm trying to install ubuntu on a sony vaio. Unfortunately i cannot boot from a cd on which i have burnt the .iso file of ubuntu. The only way i managed to install ubuntu was by creating a usb bootable stick, but here also that doesn't work so well. My workaround was to use virtual clone drive which is freeware to simulate a cd rom in windows and get the iso file started. By leaving the bootable usb stick in the computer in this way it worked...
So in the end i have grub and can load ubuntu and win xp, but then by trying to format the harddrive i kind of messed things up and had to reinstall windows. Because the DVD drive only reads original cds. So from there i will attemp to reinstall ubuntu again. But how can i get rid of win xp afterwards ? If that CD Rom would only read burnt cds or if it would habe been possible to boot from usb then i wouldn't have this trouble.
Maybe a simple question, im not sure what is running behind the curtain.
banshee
guayadeque
gnomemusicbrowser
rhythmbox
are doing the same thing with my 14k mp3 library. They all dupe exactly the same files with every full rescan of the existing music library. So i guess they all use a gnome system part for this job and there is a bug inside this part. I want to file a bug against this part but don't know the name.
I have a fileserver running 10.04 server 64bit and samba. I connect it to my desktop which is 10.04 desktop 64bit.I have the server mounted on my desktop in fstab as://10.0.0.2/share /media/share cifs guest, uid= 1000.Up until 30 June 2010 it was all fine. Now when I write the server it is very slow e.g. 2Mbps though when I read I get >100Mbps so I think my network is still ok. If i use nautilus smb://10.0.0.2/share I can write at >100Mbps and also read at >100Mbps...So any ideas why the write speed via the fstab mount samba has started to go really slowly in the last couple of days?
View 6 Replies View Relatedim on 10.10(desktop) and mdadm was v2.8.1 from 2008, very out of date so i tried 3.2.1 -> no change. mdadm raid1 read speeds are the same as single disk. note i used the tests in the disk utility benchmarking tool at first --these showed raid 5 atleast to be much better but when i tried dd reads raid5 dropped off with larger data to almost the same (slow) speed as raid1. compare:
[code]....
using two partitions will be enough to show raid1 performs at single disk speed. I dont really want to use a 4 disk raid0 just to get the read speed i should be able to get with raid1 as i dont really care about the size loss. I would of course use raid10 but i have found this suffers from the same problem (achieve same read speed as 2 disk stripe). So whilst im shocked others aren't reporting this, unless there is some obscure reason why my system would give these results i think raid1 in not behaving as it should.
I have set up a server box running Ubuntu 10.04 Server 64-bit with Squeezeboxserver, ftp, apache and all the things that I need.I am running it on a Asus P5Q pro with 9 harddrives attached.I have set up 6 1tb disks that run a raid6 array but I am wondering what would happen if the motherboard would fail me.Is it possible to just replace the motherboard with a newer one and would then the raid6 array still be intact?
I used to run a raid10 with the 6 disks on a Windows 7 machine with a software raid card but the card broke and I replaced it with a new one but the array could would not work so I had to forget all my data and this is what brought me to using a Ubuntu server as OS and running the raid array on the motherboard sata instead.Also, is it possible to make an exact copy of the boot drive/partition and easily replace that is the boot hard drive would go faulty? I have heard about the dd command and I feel it would be nice to know that I'm not totally screwed if the boot drive fails.
i just installed ubuntu and i wanna put wine on so i can install my itunes and adapters an so on. but when i try to install through terminal it always reads that theres no file found or cant complete installation. and theres no net hooked up to it cuz the wireless adapter wont work.
View 3 Replies View RelatedProblem: MATSHITA DVD RAM UJ-851S ( rev 1.50) reads dvds and plays audio/movie (.avi,.mp4,mp3,etc) but refuses to burn.
Media: Taiyo Yuden DVD (always excellent!!)
Sony DVD+/-R (w/"AccuCore" technolgy; recent purchase 3 days ago)
Sony CR -R (previously flawless, at least for audio, doc backup)
Notebook: HP Pavilion dv9000 series (dv9310us)
Symptoms: 1. Reads all media
2. Starts burn w/acetoneiso, brasero, nerolinux 4.0.0;
3. Gets to 35% - 90% complete; then each app above reports:
"unspecified error.. .. .." or words to this effect, asks for log/bug report, etc.
It isn't that I don't get sound. It just won't play. If I click a file, then click play it quickly goes through an amount of songs. Too quick to give a good number. For example, if I have 100 songs on my library, I want to play one. Obviously I click play and such to make it play but instead of playing it acts as if it can not read the file (even though all my songs are in the library). Got any help/tips/whatevers?
View 5 Replies View RelatedWe are graphing various system parameters using Cacti. One of our graphs shows hard drive reads and writes. A question came up: why do we need this graph?
View 3 Replies View RelatedMy father has an HP PSC 1510 All in One Printer - Scanner - Copier. I have recently managed to convert him over to Linux, his current distro of choice is Fedora 12.Everything was going surprisingly well until recently: the message came up on his screen saying that the ink levels were low. After replacing the cartridges the message continued to appear. However the main nuisance is that it will not allow the printer to print at all now.
The cartridges are working as he still has vista on his system and logged in and printed out from there without hassle. Is there a way to reset the memory of the printer in Fedora? I am not much help to him here as I know nothing about printers.
I got a CD with a book - doc files.When I look at it with nautilus or with wine notepad it tells me that the CD is empty. capacity 49.4 MB. It does show the name of the CD BOOK2XTRAS - so at least the name field in the first sector is where it is supposed to be.When I boot to my 2nd drive - an old win98 sys - it sees all the files on the CD. Same CD drive in each case. I go to another fedora computer I have and it does n.ot see the contents either.
View 5 Replies View Relatedwhat I am trying to do but I am not sure exactly how to do it. I want to write a shell script that will replace certain values in a file with environment specific information that it pulls from a parameters file. The paramaters file looks like the following...
[dev]
ip=10.15.109.41
name=dev1.mydomain.com
[code]...