All Questions
25
questions
0
votes
0
answers
10
views
How to format NVMe drive in Linux suitable for raid 1 and lvm on xen Host
I want to create a software raid on two identical SSDs
How do I create partitions and format them optimal?
lsblk
nvme0n1 259:0 0 953.9G 0 disk
nvme1n1 259:1 0 953.9G 0 ...
- 2,499
2
votes
1
answer
76
views
File access on SSD array suddenly slowed down; TRIM appears to be unavailable. How to enable, or what else could it be?
We have a system that's used for a GIS database (with Postgres as the underlying engine) which is using a software RAID 5 array of 4x2TB Samsung EVO870 SATA SSDs as its database drive. There is a ...
- 1,183
5
votes
4
answers
2k
views
Cloning data from a damaged SSD
The SSD went into read-only mode, so you need to move the partition to a working SSD, but I encountered the fact that the LVM size is different:
#lvm pvscan
PV /dev/sdc3 VG pve lvm2 [&...
- 63
2
votes
1
answer
4k
views
lvmcache/dm-cache writeback cache full performance
I have a SSD writeback cache in front of a HDD, set up through lvmcache (so a dm-cache). When the cache LV is not full (Data% column in lvs < 100.00%), writes go to the cache device (monitored via ...
- 23
3
votes
1
answer
991
views
Using two SSDs for Hot-Warm-Cold Caching a HDD on Linux
I currently have a debian-based Linux system that I'd like to optimize heavily. This machine has three different drives: An SLC SSD, a QLC SSD, and a 4TB HDD. I wanted to know if it was possible to ...
- 131
0
votes
0
answers
4k
views
Can't open /dev/sda1 exclusively. Mounted filesystem? [duplicate]
I'm aware that there are a lot of similar questions about this, I have tried following through the responses but nothing has helped. I'm more than happy to post more logs if needed.
The end goal: Have ...
- 101
0
votes
4
answers
2k
views
Raid 1 with 3 disks of different sizes
I'm new to this site.
I am currently configuring a server, which has these ssd disks:
1X1TB SSD NVme
2X512GB SSD NVMe
Now I would like to create a raid 1 between these disks, in which I would always ...
7
votes
2
answers
11k
views
Hetzner's installimage script, RAID1 hard drives + SSD
I just purchased a server from Hetzner, with two 4TB hard drives and one 1TB SSD. I want to setup the two hard drives (/dev/sda & /dev/sdb) in RAID1 and install the OS on them, and have the SSD (/...
- 273
1
vote
0
answers
32
views
Disorganized disks because of different disk technologies - LVM an answer?
I have a 1 TB spinning HD, and a 256 GB SSD.
I keep my OS and large projects on the SSD, for speed.
The rest is on the spinning HD, because of its size.
The problem: This means I have things to ...
- 337
9
votes
2
answers
4k
views
Are bcache and/or dm-cache considered stable for production in 2016?
I would like to use linux SSD caching (dm-cache or bcache) with Debian Jessie production servers. (kernel 3.16)
My question: Are dm-cache and bcache modules reliables in linux 3.16 ? Do I need to ...
- 93
0
votes
1
answer
424
views
Copy centos 6 modify mdadm raid 1 and clone to new mdadm raid 1 ssd
I have: Centos 6.7
grub-install -v
grub-install (GNU GRUB 0.97)
lsblk
two new SSD 128gb
Live usb with Parted_Magic_2015.03.06
/boot/grub/device.map
# this device map was generated by anaconda
(...
- 191
7
votes
3
answers
4k
views
Optimize SSD storage on Centos 6.6 - KVM
I have a Dell R610 with hardware:
H700 raid card
4xMicron MX100 512GB -> configured raid 10
I have installed Centos 6.6 on this server and configured:
KVM virtualization
Volume Group for raid 10 ...
- 71
4
votes
1
answer
2k
views
Does AIX support Advanced Format (4k sector size) SAN LUNs?
I am working with an EMC XtremIO storage array that utilizes SSD devices that use a native 4 KB sector size instead of the traditional 512 B size. I am attaching an IBM AIX 7.1 server to the array. I ...
- 43
2
votes
0
answers
950
views
task fstrim blocked for more than 120 seconds
I'm experiencing random crashes on my system.
I've narrowed the problem to the fstrim program that's launched weekly by cron.
In the console, I've got a set of blocked tasks among whigetch I find ...
- 186
1
vote
0
answers
819
views
SSD+MDRAID+LVM+KVM results in lower performance than expected
We use kvm for virtualization, the disk images are stored as logical volumes. The logical volumes are stored on a bunch of software-RAID1 (mdadm) arrays composed of Intel DCS3500 SSDs (each array is a ...
- 453
0
votes
3
answers
203
views
Setup replication from one local disk to another local disk ( Ubuntu )
Is there is are some way to setup local replication of the one disk to the another ( Ubuntu ) in the such way that all read operations will be involve only first disk ? Such configuration will be very ...
- 101
3
votes
2
answers
2k
views
LVM with SSD + non SSD in volume group (for snapshot storage)
I have a KVM box running some critical VMs which perform software builds. The server runs SSD drives. I have an older version of KVM which has limited snapshot capability, and I have decided to use ...
user160910
2
votes
1
answer
751
views
8kb block sizes as it relates to different storage layers
I have a PCIe SSD card that uses 8kb block cells. It supports "Virtual Controllers" that
can split this drive in half and create LVM RAID0 with 8kb stripe size.
On top of that I install a file system ...
- 2,372
1
vote
2
answers
844
views
What kind of performance overhead with LVM on Fusion ioDrive2 as Oracle DB 11gR2's Flash Cache?
This is a bit wordy, so please bear with me. :)
We have a RAC cluster of 3 Oracle 11gR2 servers and purchased FusionIO ioDrive2 PCIx cards for these servers to use as OracleDB's Flash Cache.
These ...
- 2,372
4
votes
1
answer
1k
views
Is TRIM passed through a LVM-based PV Xen domU to the underlying SSD
Scenario:
-- Debian Xen dom0
-- SSD drive setup as LVM PV/single Volume Group.
-- Debian pv_ops-based domU setup on LVM logical volume.
-- File system inside domU is ext4 with discard option enabled.
...
- 43
2
votes
2
answers
836
views
Worth it to move /var to physical disk vs logical?
Brief question about partition layout. I use an SSD for /, /boot, /usr, & /home partitions. I'd like to move /var to a mechanical disk to minimize writes to the SSD. I'm mainly concerned about ...
- 123
15
votes
2
answers
20k
views
SSD, Erase Block Size & LVM: PV on raw device, Alignment
I want to install a new SSD and use the the whole device as a PV for LVM - in other words: i don't plan to put even one partition on this device. So aligning partitions on the erase blocks is not ...
- 1,060
8
votes
1
answer
5k
views
Can I use dmraid instead of md (mdadm) to make software RAID-1 and RAID-1+0 volumes?
On a related question about SSDs and TRIM (see: Possible to get SSD TRIM (discard) working on ext4 + LVM + software RAID in Linux? ), it turns out that dmraid may now (or shortly) support TRIM on RAID-...
- 1,808
20
votes
6
answers
15k
views
Possible to get SSD TRIM (discard) working on ext4 + LVM + software RAID in Linux?
We use RAID1+0 with md on Linux (currently 2.6.37) to create an md device, then use LVM to provide volume management on top of the device, and then use ext4 as our filesystem on the LVM volume groups.
...
- 1,808
5
votes
4
answers
5k
views
SSD drives and RAID configurations vs LVM
Background:
I'm familiar with the basic RAID levels, and am curious to know if using SSD devices in a RAID0 or RAID5 would be a better deployment than adding them to a large LVM volume.
Specifically,...