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I have a batch of linux servers using software raid 1 that need to have both disks swapped. While this can be done one disk at a time, I'd like to know if it is possible to do both at once with a process like the following, to reduce the outages needed...
Started by DrStalker on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at serverfault):
Basically I make a 512M partition in the beginning of each disk, which serves....
The new drives as spares, and then run mdadm /dev/mdX --grow -n 4 (or however many devices you want in the system using raid1 (typically 4 or more devices).
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This may seem a bit counter-intuitive, but I'm looking for a NAS device like the QNAP that can be direct attached to a server. The rationale here would be backup speed. I would like to backup via esata, sas, or some other fast direct attach connection...
Started by Boden on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at serverfault):
Direct attached storage devices (DASD), like SAS or ESATA a boundary into something....
These devices support a variable number of drives, and can presentWhat you're looking for is a bit odd.
For an external disk array than for a NAS.
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I am wondering if there is a way to change this functonality in windows - everytime an external usb device powers off or if I unplug it, my laptop wakes up from sleep, which is really annoying. This is on Windows XP.
It can be a disk, a mouse,... Type...
Started by Robert Ivanc on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at superuser):
If you have the same problem with many devices, I guess you are going to have to change.
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Ask your Facebook Friends
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How can I discover any USB storage devices and/or CD/DVD writers available at a given time (using C# .Net2.0).
I would like to present users with a choice of devices onto which a file can be stored for physically removal - i.e. not the hard drive.
Started by Stuart Helwig on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
CDRom: The drive is an optical....
Network: The drive is a network drive.
Fixed: The drive is a fixed disk.
Removable: The drive is a removable storage device, such as a floppy disk drive or a USB flash drive.
Not have a root directory.
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Can these storage devices be accessed like normal hard drives or applications specifically target a device? The applications you guys use against these devices, do you have tell your application what they are connected to?
I mean if I have an application...
Started by Hasan Khan on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at serverfault):
If you can dedicate the disk area to one specific host, then in general SAN storage is used how traditional NAS and SAN storage technologies are....
But tons of storage devices (NetApp is the first that comes to mind) allow.
Attached storage.
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Hi,
I want to connect another hard disk to my computer, which I want to sleep 99% of the time. I will only use it for a few things, but I need it to be mounted at all times.
To achieve this I would like to know:
How do I log which processes accesses a...
Started by Kent on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at serverfault):
As well as devices on transports traditionally associated with SCSI (look for sg_start)
lsof +D /path/to/mount this:
hdparm -B 50 -S 36 /dev/....
Futils.html - The sg3_utils package contains utilities that send SCSI commands to devices.
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Is there a way to have Linux read ahead when cloning a disk? I use the program named "dd" to clone disks. The last time I did this it seemed as though the OS was reading then writing but never at the same time. Ideally, the destination disk would be constantly...
Started by Mike on
, 8 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
If not, non-blocking or even asynchronous reads/writes uses a block size equal to the disk....
Are you sure it isn't doing that at the same time? I would expect the disk caches to make sure it that happens.
One disk and writing the other.
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I know that the slower disk will constrain speed and the smaller disk will constrain size.
Is it possible to use the extra space on the larger disk in some fashion (ie. as a separate, non-striped partition)?
In my case, this would be with the onboard ...
Started by Albert on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at serverfault):
This additional I/O will slow down these disk and as a result will degrade linux software raid, than why not ? As long linux md uses partititions as primary devices, you can.
Things on the side.
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I am a Solaris newbie. I have a Solaris 10u8 machine that is running an attached J4400 and some internal drives. We're using multipathed SAS I/O (stmsboot; mpathadm), so the device mount points have been moved off from their normal c0t5d0 to long strings...
Started by Karl Katzke on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at serverfault):
What good is multipathing if replacing a hot-swappable disk requires a reboot?
So basically, while you can multipath I/O via SAS ....
Can't edit your device configuration! That means that you can't remove a disk and insert a new one.
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On Fri, 4 Jul 2008 10:41:53 +0200, Bastian Blank <waldi@debian.org
Package: udev
Version: 0.114-2
Severity: grave
udev not longer creates /dev/disk/by-path symlinks for dasd devices. The
s390 boot setup relies on its availability to find the root...
Started by Bastian Blank on
, 7 posts
by 2 people.
Answer Snippets (Read the full thread at omgili):
| drwxr Jul 4 12:22 ccw-0.0.0300 -|....
Dev/disk/by-path
| ls: /dev/disk/by-path: No such file or directory
| (initramfs) echo add | (initramfs) ls -al /dev/disk/by-path
| drwxr-xr-x 2 0 0 60 Jul 4 12:22 .
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