Tagged Questions

10
votes
1answer
3k views

For L2ARC and ZIL: is it better to have one large SSD for both, or two smaller SSDs?

Main references ZFS L2ARC (Brendan Gregg) (2008-07-22) and ZFS and the Hybrid Storage Concept (Anatol Studler's Blog) (2008-11-11) include the following diagram: Question Should I interpret the ...
0
votes
1answer
403 views

ZFS SSD Trim and Software Raid 5

I am trying to find if the ZFS filesystem has added support for Trim to Raid 5? I am setting up an SSD array in Raid 5. I also would like to know if there is any good software raid 5 alternatives to ...
2
votes
1answer
869 views

How do physical disks passed through ESXi perform vs. passing through HBAs?

Context: I have a SAN operating system (Nexenta) that runs on ESXi. It has a couple of HBAs passed through to it already, via VT-d. All of the HBAs for the SAN OS are full (no free connectors). I ...
9
votes
3answers
3k views

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 ...
3
votes
2answers
736 views

ZFS: best practices for adding cache to pools

sounds like dumb question but there are no ready answers at SF can the cache pool have different name than the zpool? eg: suppose there is a zpool "tank" serving NFS and iSCSI can a new cache pool ...
1
vote
2answers
645 views

how many disks can saturate a 6GSAS controller ? :LSI 9260-8i

This is my build: LSI 9260-8i: MAX read throughput of 2,875 MB/s, write performance of 1,800 MB/s 24x SAS 10K RPM drives 2x 100GB Dell SSDR (SATA) drives for ZIL and L2ARC All plugged to same ...
5
votes
2answers
2k views

What's in my ZFS ARC and L2ARC caches?

I have a simple ZFS setup at home, four disks mirrored, 8GB ram and 120GB Intel X25-M SSD for L2ARC. I ran zpool add poolname cache cXtXdX then generated load and eagerly tracked the warming process ...
5
votes
2answers
2k views

Will adding a SSD cache device to my ZFS storage improve performance?

The server has 4GB of RAM and my zpool is made up of 15.5k SAS drives arranged like this: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 raidz1-0 ...
9
votes
2answers
2k views

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?
4
votes
2answers
2k views

ZFS with L2ARC (SSD) slower for random seeks than without L2ARC

I am currently testing ZFS (Opensolaris 2009.06) in an older fileserver to evaluate its use for our needs. Our current setup is as follows: Dual core (2,4 GHz) with 4 GB RAM 3x SATA controller with ...
0
votes
6answers
4k views

ZFS - zpool ARC cache plus L2ARC benchmarking

I have been doing lots of I/O testing on a ZFS system I will eventually use to serve virtual machines. I thought I would try adding SSD's for use as cache to see how much faster I can get the read ...
1
vote
2answers
965 views

NTFS journal on different (SSD) disk

Some advanced file systems, like ZFS have the option of using SSD disks as a second level cache for the file system or for the journal. Is this possible with NTFS?