Questions about hard disks' performance, issues, tips, and software.

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4
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0answers
671 views

Setting the queue length on HP p410(i) controllers

The guys responsible for the DB performance tuning asked me to change the queue depth on the two HP p410(i) controllers of my DL380 G6 server. They want me to switch it from automatic to 64. ...
3
votes
0answers
90 views

What causes SCSI command timeout over 30 seconds?

System description: CentOS 7. SuperMicro X9DRW-iF board. Latest BIOS (and SCU option ROM), using SCU option ROM. Four 300GB WD HDDs connected to the board's SCU. Six HDDs connected to the six ...
2
votes
0answers
14 views

Forking loads disk

I have a prefork/fork daemon. By atop I see, that master-process often consumes disk: PID TID RDDSK WRDSK WCANCL DSK CMD 16830 - 7264K 48696K 18624K 10% our daemon From strace I see, that it ...
2
votes
0answers
2k views

Windows Server Backup [2012 R2] - Went from 100+ copies available to 1 copy available overnight

I'm using Windows Server Backup on a Windows Server 2012 R2 system that has been in production for half a year or so. The server has around 60GB used, and the backup drive is a 160GB external drive ...
2
votes
0answers
231 views

Are /dev/disk/by-id symlinks unreliable?

I am provisioning a Nova server and Cinder volumes using a Heat template. In order to identify the Cinder volumes attached to my OpenStack server I would like to use the /dev/disk/by-id/... symlinks ...
2
votes
0answers
230 views

actual disk iops and write merging

/dev/sdb has LVM and exposes a single logical volume, dm-0. While writing to dm-0, /proc/diskstats reports: # of writes completed sdb 29646717 dm-0 131315099 # of writes merged: sdb 101668283 dm-0 ...
2
votes
0answers
1k views

ext4 root filesystem corruption under XenServer 6.2 DomU

We're with a problem with filesystem corruption in guest machines in a XenServer 6.2 It only happens in Linux Machines. Randomly the filesystem remounts as read-only and them corruption starts on the ...
2
votes
0answers
240 views

Shrinking a volume and extending another in dynamic disk

I have a test environment where I converted a disk to dynamic, shrunk a volume, and then expanded another all on the same disk. The result is that disk management in Windows Server 2008 R2 shows two ...
2
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0answers
326 views

Convert single O/S disk to RAID 1 - Ubuntu 12.04 LTS

I have a server running Ubuntu 12.04 LTS with only a single drive. There are 2 more empty hot swap bays in the chassis. I want to add a little redundancy by adding a RAID 1 to the system. The ...
2
votes
0answers
588 views

What might cause DIR $file to report “File not found” when DIR $dir shows the same file just fine?

I can DIR a file and it doesn't exist, but DIRing its directory, or a file in the same directory as it, works fine. Is this a hardware or software problem? If it's hardware, is it the drive or ...
2
votes
0answers
837 views

udisks-daemon eating up all my memory

I'm operating a little storage server on debian, over the past months I've noticed the process udisks-daemon eating up almost all available memory. Is this just really aggressive caching or a memory ...
1
vote
0answers
21 views

Can you have an MBR partition and a GPT partition on the same RAID 5 VHD in Windows Server 2008 R2?

I have a Power Edge T610 with a PERC 6 RAID 5 Array, recently i posted a question about expanding the array with other drives and was able to use OMSA to add additional drives to the array and then ...
1
vote
0answers
54 views

Read only file system after every reboot - centos

Some time ago I got disk full problem and after that everytime I reboot my centos server, the system loads with read only system files. Running mount -o remount,rw / will solve my problem. But ...
1
vote
0answers
30 views

Is my drive good or going bad?

I just ran SMART on my server's drives but I'm not too sure how to interpret it. My results seem like the drive is doing fine, but I would like a second (or third) opinion, just to be safe. Here are ...
1
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0answers
22 views

M5015 Disk controller - Replace failed disk used working disk

I have an IBM X3200 M3 machine with a M5015 SATA Disk controller (RAID 5). One of the disks has failed ie orange light flashing on the disk. I intend to replace the damaged disk with a used disk of ...
1
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0answers
52 views

Can I swap out caddie tray to use hard drive with another server?

Supporting legacy (Sun Fire X4100) equipment, looking to purchase drives of higher capacity and/or get better pricing by not limiting my selection to former-Sun hard drives. I've been told that ...
1
vote
0answers
46 views

Best way to remove drives from MDADM raid array

I have a situation with a RAID array; I'm concerned that the drives in the array are going to fail soon, and given their age, I would rather replace them sooner than later. The problem I have, is ...
1
vote
0answers
109 views

HD recognized by BIOS but not Linux or GParted

I have an old (2007) Dell Precision Workstation 690 with Ubuntu 12.04. It has 2 mirrored 139G SAS drives for OS and 2 WD Black 2TB data drives that were formatted ext4 and rsynced and had my virtual ...
1
vote
0answers
109 views

Replacing a HDD in FreeNAS

I got a message that said one of my hard drive was degraded and im trying to figure out how to check which drive it is. I did zpool status and I got this zpool status pool: BiggyD state: ...
1
vote
0answers
426 views

How do I interpret a very high Avg. Disk sec/Write perfmon value?

Short version: Is the perfmon screenshot shown below enough evidence to say "something is wrong with your storage system"? Long version: I am debugging a performance problem: Some SQL Server query ...
1
vote
0answers
92 views

Partitions not recognized when installing Kubuntu 14.04 over complex RAID setup

I have three identical HDDs. Using a ROM utility, I configured the use of 90% of each of them as a RAID 5 array, and the other 10% as a RAID 0 array. That is, each array uses some area on all three ...
1
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0answers
96 views

how to filter sar -d disk output tidily

sar -D output-I would like a suitable command to run alongside stress -hdd but this is the output which sar -D 1 10 gives. I have filtered it using both awk |'NR > 1 {printf ...
1
vote
0answers
39 views

(Unexpected?) blkio controller behavior

I'm using docker 1.4.0 with lxc-1.0.6 and cgroup-lite-1.1.5 on Ubuntu 12.04. I have 3 hard disks (/dev/[sdb-sdd]) that I write to from 3 distinct containers. They have only one XFS partition, mounted ...
1
vote
0answers
28 views

smartd rule does not work

I have an issue with smartd. I've studied its man page, and then I've set the SMART daemon to run long test of the hard disks two times a month and alert to the specified mail address in case of ...
1
vote
0answers
885 views

XenServer 6.2 Read Only and Slow Disk I/O

I virtualized a datacenter a few months back and we have a pool of 3 HP DL360 G5 servers, each with 32GB of Memory and dual Intel Xeons. Recently we have been experiencing 2 issues, the first of which ...
1
vote
0answers
398 views

VMware ESXi multiple I/O latency warnings

VMware ESXi 5.1.0 server showing multiple warning events: Device mpx.vmhba1:C0:T0:L0 performance has deteriorated. I/O latency increased from average value of 3913 microseconds to 530954 ...
1
vote
0answers
2k views

HP Dl360e Gen8 Not Detecting Hard Drives

I have a new HP Proliant DL360e G8 and it is not detecting the hard drives. We are using both non-hp, and official hp hard drives from an older server (DL120). Hard drives are 3.5" and they are not ...
1
vote
0answers
92 views

Unable to access disks in rhel 6.5

I work for a biology lab. We recently bought a new microscope that produces an enormous amount of data - it is simply not feasible to store it on a desktop. So, we bought a storage server - the idea ...
1
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0answers
265 views

Debian mail server's Maildir folder with too many files causing disk I/O to go on high load

I have a Debian mail server running Postfix, Courier and Maildir, with disks on EXT3 filesystem. I have noticed that when I use my webmail application (Squirrelmail, in this case). It gets some kind ...
1
vote
0answers
248 views

Virtual Allocation Unreasonably High

Just upgraded our pool to Xenserver 6.2 and installed a brand new host, also with Xenserver 6.2. Was excited about the new features since Xenserver was fully open-sources (over-allocate ram, ha live ...
1
vote
0answers
88 views

Hardware configuration for head nodes (HDDs, memory, processor, redundancy)

I'm designing a head node whose primary function is to submit jobs to the Torque/Maui scheduler and secondary function is to run test jobs. Unfortunately, most hardware selection guides for clusters ...
1
vote
0answers
197 views

best setup for fast sustained streaming (sequential?) disk writes

i am setting up a high speed/high resolution scientific image acquisition system. i need data write rates of ~1 GB/sec sustained for ~1 hour. i don't have experience with raid, but my plan is to ...
1
vote
0answers
35 views

WS2003 network drive gets deactivated after restart

windows server 2003 OS runs sql backups regularly and periodically i have to restart once in a while. when the restart takes place the network drive(H) becomes deactivated which i do not understand ...
1
vote
0answers
1k views

Differences between hdparm --read-sector and dd with “Current Pending Sectors”

This was originally an "answer" to How to use hdparm to fix a pending sector? I'd been getting SMART notifications for the same "Current Pending Sector" for days. The dd solutions around weren't ...
1
vote
0answers
49 views

partitioning a 2x larger disk to house zfs migration

so there are numerous sites taking about using vdevs made from disk partitions like this in order to reorder vdevs of different sizes. however, i have the following physical disks: Disk /dev/sda: ...
1
vote
0answers
283 views

Resize a RAID 5 Partition

I'm moving my VG to a RAID, i have 3 disk 600GB, the VG is in the partition /dev/sdc2 /dev/sdc1 1G type linux <-- Boot partition /dev/sdc2 599G type Linux LVM One disk have the VG and with the ...
1
vote
0answers
112 views

Rebalance pooled disks

Using mhddfs multiple drives were pooled to form a big virtual mountpoint. Now using the mlimit option unbalancing is prevented, but the drives are already in an unbalanced state. Is there a script ...
1
vote
0answers
610 views

Cannot initialize disk in PowerShell : Initialize-Disk throws “The disk has already been initialized”

I'm trying to change the flash drive's partition style to GPT using PowerShell, but the cmdlet throws "The disk has already been initialized" (even though I've cleaned the drive): PS ...
1
vote
0answers
709 views

SSD Performance under Oracle

I have serious performance issues with oracle running over ssd. I have two OCZ Vertex 3 MAX IOPS drives (firmware 2.15). It runs on a INTEL C600 SATA Chipset. Windows 2008 R2. So the issue is ...
1
vote
0answers
88 views

Ubuntu 11.04: FW400 drive won't remount on reboot

Ok, still a *nix n00b, and the answer is likely staring me in the face. Please be patient. Problem FW400 external drive will not mount on system reboot. FW cable needs to be disconnected and ...
1
vote
0answers
1k views

mdadm raid1, [1/2] disks failed, safe to reboot?

I am seeing the following under /proc/mdstat Personalities : [raid1] md1 : active raid1 sda2[0](F) sdb2[1] 976554876 blocks super 1.1 [2/1] [_U] bitmap: 4/8 pages [16KB], 65536KB chunk md0 : active ...
1
vote
0answers
150 views

SAS disk performance drops a while after reboot on cent 5.5 boxes

So we have some workstations with identical hardware. The Fedora14 box has a couple weeks uptime and still get good performance. hdparm -tT /dev/sda /dev/sda: Timing cached reads: 21766 MB in ...
1
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0answers
872 views

renaming hard drives (sdc to sdb) on the fly

ata2: link is slow to respond, please be patient (ready=0) kernel: [2761026.198796] ata2: soft resetting link kernel: [2761031.226669] ata2.00: disabled kernel: [2761031.226720] ata2: EH complete ...
1
vote
0answers
194 views

Why would a diskless boot linux box stop seeing local hard drives?

A little background... I work on a system that uses PXE booting for the majority of the nodes. Several of these nodes have local hard drives that are used for persistent storage of data needed for ...
0
votes
0answers
26 views

Google compute engine - shrinking disks

I have a 5TB HD and I want to shrink it to 2TB. I use Google Compute Engine PaaS. How can I do that? Can you suggest any tools to perform this manually if this cannot be solved by Google's tools?
0
votes
0answers
16 views

Recovering Megaraid Storage Array After Power Outage

I suspect I know the answer to this (namely, that there is no hope whatsoever), but thought I'd take the liberty of asking the question in the unlikely event there may be some hope, however remote it ...
0
votes
0answers
23 views

CentOS df misreports free disk space (due to mounted volume?)

I have a server with an LVM volume mounted under /mnt. When running df -h to check free disk space, it appears to show the space consumed under /mnt as being used in /: [root@monitor spool]# df -h ...
0
votes
0answers
15 views

Debian: USB HD Random Disconnect

I've a debian box (Sheevaplug) everything seems to be ok, however I've an external hard drive attached to the USB port and sometimes the drive seems to disconnect itself randomly... and connect, I get ...
0
votes
0answers
10 views

sg_format 512e to 4096

We have Hitachi 8TB Helium drives, which come in Advanced Format or otherwise known as 512e (4096 native sector to 512 emulated). I want to see if our systems can fully cope with 4096 native sector ...
0
votes
0answers
24 views

Can't mount SATA drives when moved from USB enclosure to internal

I have had 4 external drives connected over USB to my Dell Precision 490 workstation. They are in /etc/fstab by uuid and formated as UUID. UUID=04c37bff-b93e-440e-acd0-3d984ddb2ec3 /mnt/drive0 ext4 ...