Tagged Questions

0
votes
1answer
167 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 ...
1
vote
2answers
112 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 ...
0
votes
0answers
25 views

Does SSD TRIM (discard) work on ext4 + nested LVM in Linux? [duplicate]

Possible Duplicate: Possible to get SSD TRIM (discard) working on ext4 + LVM + software RAID in Linux? I will be setting up KVM guests on a computer of mine soon. I plan to run Ubuntu ...
4
votes
1answer
251 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. ...
2
votes
2answers
489 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 ...
6
votes
2answers
3k 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 ...
8
votes
1answer
2k 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 ...
16
votes
6answers
8k 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. ...
4
votes
4answers
2k 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. ...