Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [ssd]

Solid-state drive refers to a data storage device that uses solid-state memory to store its persistent data.

832 questions
10
votes
3 answers

ZFS - Impact of L2ARC cache device failure (Nexenta)

I have an HP ProLiant DL380 G7 server running as a NexentaStor storage unit. The server has 36GB RAM, 2 LSI 9211-8i SAS controllers (no SAS expanders), 2 SAS system drives, 12 SAS data drives, a hot-spare disk, an Intel X25-M L2ARC cache and a…
ewwhite
  • 197,159
  • 92
  • 443
  • 809
10
votes
2 answers

ZFS and cache devices

I'm going to add a SSD drives to my ZFS storages as a cache. Anyone has any experience with this? What if cache device dies, will the any data be affected?
disserman
  • 1,850
  • 2
  • 17
  • 35
10
votes
4 answers

Does putting the XFS log on an SSD significantly improve performance?

I have a five disk array running XFS in RAID5, and I would like to improve it's performance. I have seen some hints that putting the log onto a separate device can help, does putting the log onto an SSD help dramtically? In theory, it should, but I…
Paul Wagland
  • 344
  • 3
  • 11
9
votes
5 answers

Can we upgrade Dell's basic Server R240 (which still uses HDD 7200RPM) to an SSD?

Today I was shopping for the most basic dell rack server which is the R240. Ironically, they are still using HDD 7200 RPM, with no option for SSD in their selection; and we're approaching…
user1034912
  • 1,345
  • 3
  • 14
  • 20
9
votes
4 answers

Using SSD as disk cache

Is there software for Linux to use an SSD as disk cache? I believe that Sun does something like this with ZFS, though not sure. A quick search provides nothing suitable. The goal would be to put frequently requested files on the SSD on-the-fly. …
casualcoder
  • 380
  • 1
  • 4
  • 13
9
votes
2 answers

Why do sequential writes have better performance than random writes on SSDs?

An LBA (logical block addresses) is a mapping table implemented in the FTL to match between logical and physical pages/blocks in SSDs, my guess is that most SSDs (at least when they are empty) keeps the physical addresses in the same order as the…
SamTh3D3v
  • 273
  • 2
  • 10
9
votes
2 answers

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 upgrade my kernel to a more recent version ? I also…
sligor
  • 93
  • 1
  • 5
9
votes
4 answers

SAN with a few SSD drives, or lots of old fashioned HDDs?

My company is trying to figure out what type of SAN to purchase. This is specifically for database servers that are becoming IO constrained (storage is DAS right now, but we're hitting the limit of a single server and we'd like to add clustering as…
Beep beep
  • 1,833
  • 2
  • 18
  • 33
9
votes
3 answers

Why do servers have SAS instead of SSDs?

I was wondering why do servers still come with SAS disks instead of SSD disks? I know that SAS are faster than normal hard drives but they are still much slower than SSDs. I think they are more expensive too :s so what's the deal here?
katie
  • 101
  • 1
  • 1
  • 3
9
votes
2 answers

How do I verify that my hosting provider gave me SSDs?

I searched and found 2 options, none of which I'm confident provided me the answer. 1: cat /sys/block/sda/queue/rotational This output '1' to stdout. What does this mean? 2: lshw -class disc but couldn't find anything that answers my question.
Amir Bar
  • 213
  • 2
  • 7
9
votes
5 answers

SSD + LUKS performance comparison?

Our laptops and portable drives must be LUKS encrypted. LUKS doesn't really seem to cause much performance loss on normal laptop hard drives (7200RPM) for us. With the crazy data rates you get with SSDs, is that still true? I searched around a…
darron
  • 463
  • 1
  • 4
  • 15
9
votes
5 answers

SQL Server 2K/2K5/2K8 and Solid State Disks: Specific Optimizations?

Is anybody here running SQL Server on solid-state drives? Have you found any specific optimization tips? I'm specifically interested in ways to reduce the frequency with which SQL Server performs small random write operations since they're the…
John Rose
  • 276
  • 1
  • 8
9
votes
3 answers

How do SSD fail near end of life?

Let's say a MLC SSD has lasted a very long time and the first cell has hit its last erase cycle and refuses to erase. What happens after that? Does the controller detect that as a bad block and moves to the next one and tries to erase that instead?…
Pyrolistical
  • 892
  • 2
  • 13
  • 20
9
votes
3 answers

Causes of sudden massive filesystem damage? ("root inode is not a directory")

I have a laptop running Maverick (very happily until yesterday), with a Patriot Torx SSD; LUKS encryption of the whole partition; one lvm physical volume on top of that; then home and root in ext4 logical volumes on top of that. When I tried to boot…
poolie
  • 1,165
  • 1
  • 9
  • 17
9
votes
5 answers

Putting Oracle redo logs on DRAM SSD for a heavy write database?

I have a Sun M4000 connected to an EMC CX4-120 array with a write-heavy database. Writes peak at around 1200 IO/s and 12MB/s. According to EMC, I am saturating the write cache on the EMC array. I think the simplest solution is to move the redo logs…
rmeden
  • 192
  • 2
  • 8
1 2 3
…
55 56