I have ClearOS (CentOS) installed. I have 2 x 2TB SATA HDDs (hda & hdc). At installation time, I configured a RAID 1 (and LVM) between the two HDDs. After a power problem happened, the two HDD were re-syncing and I checked it using: watch cat /proc/mdstat The speed didn't exceed 2100 KB/s I tried the following with no change:
echo 50000 > /proc/sys/dev/raid/speed_limit_min
I have a low power machine I use as an SFTP server.It currently contains two raid 1 arrays, and I am working on adding a third. However, I'm having a bit more trouble with this array than I did the prior arrays.My suspicion is that I have a bad drive, I am just not sure how to confirm it.I have successfully formatted both drives with EXT3 and performed disk checks on both which did not indicate a problem.
I can see it progressing in the blocks count, but it's incredibly slow. In the course of 5 minutes it progressed from 1024/1953511936 to 1088/1953511936.Checking top, not even 10% of my CPU is being used. Are there any other performance items I could check that could be affecting this?
I am learning software raid 1 with centos 5.5. I created the raid with out any problems and removed the first drive to check there was no problems and it booted. I have installed the old drive back in the system as hdc and need to resync the drives (used old drive as partitions correct) I thought I could use raidhotadd but id does not seem to exist anymore. how I resync the drives in the array hda primary and hdc secondary using mdadm
View 1 Replies View RelatedI have 2 servers both with software raid 5 for the main storage partitions. 6 x 1.5 Tbyte drives. I observe that the these arrays seem to resync quite often. cat /proc/mdstat or smartctl -a does not show any problems with the drives. Is this normal. What is the default period between resyn. What would cause a resyn of the array. The standard resync time for the array is over 900 minutes which can become an inconvience for the server users if it occurs on a week day as it degrades the performance.
View 1 Replies View RelatedI am running Kernel 2.6.18-128.el5 on a 64bit quad core machine with 8GB RAM. Using "mdadm" I setup a RAID1 array between two Western Digital 1.5TB drives. The problem is that the resync is running VERY slow. Here is a current status.
[root@royalflush shared]# cat /proc/mdstat Personalities : [raid1]
md1 : active raid1 hdc5[1] hda5[0]
1304493952 blocks [2/2] [UU]
[=>] resync = 6.2% (81592192/1304493952) finish=4280156.0min speed=4K/sec
unused devices: <none>
I have recently migrated my file server over to a HP Microserver. The server has two 1TB disks, in a software RAID-1 array, using MDADM. When I migrated simply moved the mirrored disks over, from the old server Ubuntu 9.10 (server) to the new one 10.04.1 (server).I Have recently noticed that write speed to the RAID array is *VERY* slow. In the order of 1-2MB/s order of magnitude (more info below). Now obviously this is not optimal performance to say the least. I have checked a few things, CPU utilisation is not abnormal (<5%) nor is memory / swap. When I took a disk out and rebuilt the array, with only one disk (tried both) performance was as to be expected (write speed >~70MB/s) The read speed seems to be unaffected however!
I'm tempted to think that there is something funny going on with the storage subsystem, as copying from the single disk to the array is slower than creating a file from /dev/zero to the array using DD..Either way I can't try the array in another computer right now, so I though I was ask to see if people have seen anything like this!At the moment I'm not sure if it is something strange to do with having simply chucked the mirrored array into the new server, perhaps a different version of MDADM? I'm wondering if it's worth backing up and starting from scratch! Anyhow this has really got me scratching my head, and its a bit of a pain! Any help here would be awesome, e-cookies at the ready! Cheers
how can I stop resyncing permenently & how can I check whether the normal sata HDDs can support RAID before/after buying HDDs. Because on every saturday or sunday resync is starting itself even there is no entry about resncing in crontab. But if I run "cat /proc/mdstat" it is showing RAID1 is perfect. see the below output
#cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 hdb1[1] hda1[0]
513984 blocks [2/2] [UU]
[code]....
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 have a small SDD system disk and a large data disk on a server based on fedora core. It is organized this way so that the data disk can be spun down most of the time, reducing noise and heat.I'd like some way to periodically create a bootable backup of the system disk on the data disk, so that if the SDD goes belly-up, I lose minimal data and can very quickly bring the system up.Some thoughts:1. I know I can create a partition on the large disk and make the system boot from a raid0 mirror.However, the constant writes to the system disk (e.g. by the journal daemon) will ensure it never spins down.2. I can do a periodic format and cp -ax to the "copy of system" partition, but that doesn't leave the disk bootable because it needs changes to the /etc/fstab, and possibly a mkinitrd to become bootable.3. Or something like boot from a TFS (translucent filesystem) where base layer would be the raid, and the writable layer would be on the SDD, with periodic pushes of the writable part to the base layer (I'm not sure this is even possible).
4. In a virtual world this could be managed by appropriate location and use of snapshot images, but I'm not in a virtual world - as far as I know :0).Ideally I'd like something like raid that only brought the copy of system disk into sync with the running system infrequently (perhaps every few hours). Can anybody suggest how to do this?
I am currently running Debian Squeeze on a headless system mainly used for backup.It has a RAID-1 made up of two 1TB SATA-Disks which can transfer about 100 MB/s reading and writing. Yesterday I noticed that one of the disks was missing from the RAID configuration. After re-adding the drive and doing a rebuild (ran with 80-100MB/s)
View 5 Replies View RelatedHow long does hardware Raid card (raid 1, 2 drives)take to mirror a 1 TB drive (500gb used)?Is there a general rule of thumb for this?4 hours? 12 hours? 24 hours?
View 1 Replies View RelatedI am trying to connect a RAID Box to the server via LSI 8880EM2 RAID controller.The raid box is FUjitsu Externus DX60 with raid 1 configured.The server is Fujitsu Primergy SX300 S5 with LSI 8880EM2 RAID card.The external raid box is being recognised by the raid controllers bios.
The server runs CentOS 5.5 64bit. I have installed the megaraid_sas driver from LSI website and MegaCLI utility but CentOS still fails to see the box.MegaCLI utility, when launched from CentOS, recognises the raid box, CentOS does not(no mapping being created in /dev).
I have also tried to create a logical RAID0 HDD on one physical HDD(as seen by MegaCLI) with MegaCLI utility in CentOS.The result was success and the new logical drive could have been used, but when restarting the server, the controllers' bios fails with an error (not surprised(one logical RAID0 on one physical HDD)) and configuration is being erased.
Has anyone tried connecting 8880EM2 controller to a raid box with raid configured on the box, running it all under CentOS and what were the results.
Have Lian Li Ex 503 External Raid System, using 4x2TB, using Raidmode 10 for good performance [ Just for those who are interested: http://www.lian-li.com/v2/en/product/pr ... ex=115&g=f ]
[Code]...
But using e-sata my transfer rates are very low (from internal drive to external ex503), around 60-70mb/sec
But hdparm tells me:
[Code]...
i have setup a software raid with mdadm. It consists of 4 hdds (1 samsung hd203wi and 3 * hd204ui) each with 2tb. When im doing benchmarks with bonnie++ or hdparm i get about 60mb/s write speed and 70mb/s read speed. Each single drive from the array has a read speed of > 100mb/s when testet with "hdparm -t".Im using opensuse 11.4 x64 with the latest patches from the update repositories. Im using the 2.6.37.6-0.7-desktop kernel.I have 4gb ram and an atom d525.
View 9 Replies View RelatedAs the title says, my raid system is very very slow (this is for raid5 6x1Tb SAMSUNG HD103UJ):
Code:
leo@server:~$ sudo hdparm -tT /dev/sdb
/dev/sdb:
Timing cached reads: 1094 MB in 2.00 seconds = 546.79 MB/sec
Timing buffered disk reads: 8 MB in 3.16 seconds = 2.53 MB/sec
It's impossible and I've tried every configuration (raid5,raid0,Pass Through), and I become nearly exactly the same speed (with restarts, so I'm sure I'm really talking with the volumes I've defined).
One can compare it with the system drive :
Code:
leo@server:~$ sudo hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 1756 MB in 2.00 seconds = 878.12 MB/sec
Timing buffered disk reads: 226 MB in 3.01 seconds = 75.14 MB/sec
Some hardware/software infos :
Code:
Raid card
Controller Name ARC-1230
Firmware Version V1.48 2009-12-31
Code:
Motherboard
Manufacturer: ASUSTeK Computer INC.
Product Name: P5LD2-VM DH
Code:
leo@server:~$ uname -a
Linux server 2.6.31-20-server #58-Ubuntu SMP Fri Mar 12 05:40:05 UTC 2010 x86_64 GNU/Linux
Code:
IDE Channels .....
I'm a bit lost now. I could change the motherboard, or some bios settings.
I've just finished setting up a RAID 1 on my system. Everything seems to be okay, but I have a very slow boot time. It takes about three minutes between the time I select Ubuntu from GRUB and the time I get to the login screen.
I found this really neat program called bootchart which graphically displays your boot process.
This is my first boot (after installing bootchart). I'm not an expert at reading these, but it appears there are two things holding up the boot, cdrom_id and md_0_resync. I tried unplugging my CD drive SATA cable, and this is the new boot image.
It's faster, but it still takes about a minute, which seems pretty slow on this system. The md0 RAID device is my main filesystem. Is it true that it needs to get resynced on each boot?
I'm not sure how to diagnose my CD drive issue. The model is a NEC ND-3550A DVD RW drive. I should also note that there's a quick error message at startup about the CD rom. It's too quick for me to read it, just one line on a black screen saying "error: cdrom something something".
I have a 4 drive RAID 5 array set up using mdadm. The system is stored on a seperate physical disk outside of the array. When reading from the array its fast but when writing to the array its extremely slow, down to 20MB/Sec compared to 125MB/Sec reading. It does a bit then pauses, then writes a bit more and then pauses again and so on.The test i did was to copy a 5GB file from the RAID to another spare non-raid disk on the system average speed 126MB/s. Copying it back on to the RAID (in another folder) the speed was 20MB/s.The other thing is very slow several KB/s write speed copying from eSATA drive to the RAID.
View 9 Replies View RelatedI set up software RAID 5 on three 7200rpm Seagate Barracudas (2x80GB, 1x40GB) with 40 GB partitions on the beginning of all three disks.Now, when I do benchmarks using the Disk Utility I get about 52 MB/s read speed on the array. This seems kinda slow considering the average read speed on each individual drive is about 48 MB/s. Also, boot up takes about 30 seconds, which is the same as when I had Ubuntu installed on just one of the 'cudas, without RAID. Now, I am I missing something? Shouldn't the read speed be more that twice as fast since it can read from all three disks?
View 1 Replies View RelatedRecently did an apt update and upgrade to my CLI only Lenny server. Upon reboot I get an "ATA softreset failed (device not ready)" for all of my SATA drives. I noticed the upgrade changed the kernel to "Linux debian 2.6.26-2-amd64" (do have 64bit CPU).Once loaded to a command prompt I can assemble my raid 6 array with the command "mdadm --assemble /dev/sda to sdd" then mount it with mount -a. But transfers to the array areorribly slow ~1mbs.Upon reboot i get the same errors and have to assemble my array every time
View 1 Replies View RelatedI've been, for some years, an happy user of Highpoint HPT374 based RAID cards, using RAID 5 with decent performances (constantly around 90 MB/sec in read, and 60 MB/sec in write ). Old Athlon mobo , with 2.6.8 kernel. Now the mobo is dead, so I've got an Asrock A330GC (dual proc with 4giga ram), installed Debian with kernel 2.6.26 and moved the controller and disks , and the performances have dropped to a painful 9 MB/sec in write, measured with dd of a huge file (interrupted with kill -USR1 [pidof dd]).
Read performances are still around 90MB/sec, using hdparm -t , repeated many times , figures are constantly around 90MB/sec. I suspect some libata issue , in old kernel the raid was seen as hdb, now is sdb, some driver(s) of the PATA disks may be responsible. I've used the driver, from Highpoint v2.19 , the latest driver is broken (causes kernel oops during format of raid), I've informed Highpoint.
Here some info :
hdparm -i /dev/sdb :
HDIO_GET_IDENTITY failed: invalid argument .
lspci :
00:00.0 Host bridge: Intel Corporation 82945G/GZ/P/PL Memory Controller Hub (rev 02)
00:02.0 VGA compatible controller: Intel Corporation 82945G/GZ Integrated Graphics Controller (rev 02)
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01)
00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 01)
00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 2 (rev 01) .....
So, I figure it's high time I learn to use this utility (or something else, doesn't matter to me). I want to backup a photo directory from an internal to external drive.
When I explore in Ubuntu, it names my external drive SimpleDrive . . . the destination directory on that drive I call Backup PhotoBank 31811. I think I had a leading zero that Ubuntu drops for the date (031811).My source drive is referred to by Ubuntu as 320 GB Filesystem, and the source directory on that drive is referred to as PhotoBank.
When I use these designations on the command line, rsync returns error messages stating that no such file or drive exists (note, I have not referenced any files within the directories).If I click on properties for the 320 GB Filesystem, there is another name designated, a very long combination of numbers and letters.I've tried using that name, but still get the same error messages from rsync.
Is there a front end for this program that is more graphical in nature? I don't mind using the command line, as I know that once I get this sorted out, it should be no problem, but I'm not too proud to resort to the ultimate in simplicity.
I am seeking to copy the files from the internal one time, then, I plan to delete the files from the internal, load it back up, copy the new files to the external, and so forth. I'm not really looking to sync the two drives.
I am looking to convert a raid 1 server I have to raid 10. It is using software raid, currently I have 3 drives in raid 1. Is it possible to boot into centos rescue, stop the raid 1 array. Then create the raid 10 with 4 drives, 3 of which still has the raid 1 metadata, will mdadm be able to figure it out and resync properly keeping my data? or is there a better way to do it?
View 2 Replies View RelatedI have a box that doesn't have a Raid controller or a software raid running currently. I would like to make it a RAID 1. Since it seems there isn't any IDE RAID controllers hardly around, I have another HD that is the exact model as the drive currently in the box running CentOS. Can I some how add the second drive and get the box to mirror from here own out? The box gets really hot and I want to be ready for a HD failure.
View 3 Replies View RelatedI have two 80 GB IDE hard disk. I have create raid1 partition in both drive using [URL] ink. raid is working fine. But i have copy some data on one hard disk (md0) but this data is not autometically copy in second hard disk(md1). I want when data is write on one hard disk, this data autometically write in second hard disk.
View 11 Replies View RelatedOn the ReadyNAS Duo, a RAID resync synchronizes the entire contents of one disk to another. It's a slow operation. So it's not something to be done lightly. By default, it is done whenever the unit is shut down uncleanly (generally the result of a hang or power interruption). It's something that can be disabled, though, such that a resync would be done only when manually requested. The authors of the software RAID driver in Linux (called "md") came up with a nice solution to the problem of slow RAID resyncs: the md driver allows you to assign a write intent bitmap to an md device, and where it's stored is configurable (the default is to store it on the md device in question, in the superblock). So when the array goes down unexpectedly (e.g., in a power outage), only the blocks that the md device was going to write will actually be resynced.
It's sort of like a journal for the md device itself. Now, the ReadyNAS Duo doesn't seem to use Linux md at all for implementing the RAID volume, but it does have an option to disable automatic resync in the event of an improper shutdown. And that leads to my question: how necessary is it to do a resync in such an event? If the Duo uses the same method as the Linux md driver, then obviously such a resync would rarely be necessary. But if it doesn't, then it would be the equivalent of using the md driver without a write-intent bitmap, and a resync would almost certainly be necessary in the event of an improper shutdown. Does the Duo (and maybe other units) use the equivalent of a write intent bitmap for RAID write operations?
I currently have a problem in running rsync on 64 bit Debian Jessie (although the problem also occurred with 64 bit Debian Wheezy)I am trying to use rsync to archive my home directory (which is on a hard disk) to a USB memory stick. The home directory is about 18GB in size and the memory stick has 32GB.
Unfortunately, rsync hangs after copying a certain number of files and the process eventually has to be killed. Rsync was rerun but hung again at about the same point as before.This has now happened several times. Each time the hang occurs at about the same point.Use of strace after the hang shows that rsync appears to be processing a pdf file at the time, although not always the same pdf file.I originally had the rsync hang problem on a PC which ran 64 bit Wheezy and which used a USB 2.0 port.
I now am running rsync on another PC, which runs 64 bit Jessie and which uses a USB 3.0 port..I have also tried three different USB sticks, two from one manufacturer and the third from another manufacturer.All give similar rsync hangs.
Could any RAID gurus kindly assist me on the following RAID-5 issue?I have an mdadm-created RAID5 array consisting of 4 discs. One of the discs was dropping out, so I decided to replace it. Somehow, this went terribly wrong and I succeeded in marking two of the drives as faulty, and the re-adding them as spare.
Now the array is (logically) no longer able to start:
mdadm: Not enough devices to start the array.Degraded and can't create RAID ,auto stop RAID [md1]
I was able to examine the disks though:
Code:
root@127.0.0.1:/etc# mdadm --examine /dev/sdb2
/dev/sdb2:
Magic : a92b4efc
Version : 00.90.00
code....
Code:
mdadm --create --assume-clean --level=5 --raid-devices=4 /dev/sda2 /dev/sdb2 /dev/sdc2 /dev/sdd2
As I don't want to ruin the maybe small chance I have left to rescue my data, I would like to hear the input of this wise community.
I have a 6 disk mdadm RAID 10 array of Western Digital RE3 drives. IOZone and all the other tools I have tried are showing pretty lackluster reads for a six drive RAID 10 array, in the area of 200MB/s. Writes are closer to what I'd expect in that area, around 340MB/s. These drives fly with an Adaptec RAID controller, but as soon as I stick them in an mdadm array, the reads just aren't what I'd expect.
I am using what I believe to be optimal settings:
-C /dev/md2 --chunk=1024 -n 6 -l 10 -p f2 /dev/sda5 /dev/sdb5 /dev/sdc5 /dev/sdd5 /dev/sde5 /dev/sdf5
-b 4096 -E stride=256,stripe-width=768
I'm trying to setup RAID 1 on a CentOS 5 server for a zimbra email server.I get a partion schema error. Can I do this?The server is a HP Proliant ML150 G3 server with two 80GB HDD.
View 1 Replies View RelatedHere is my system: I have dell poweredge 1950 PERC 6 with 300 GB raid system. It has two disks of each 300GB RAID mirrored system. I have few applications and data that reached around 280GB. As you know, poweredge 1950 we can have only two disk.
They are not mission critical. Hence, I wanted to remove the raid system and use as a non-raid system. By doing it, The applications and data can grow upto 600GB. I do not want to loose the data and setup. I am not so clear about RAID system and its conversion.