# [OmniOS-discuss] Pliant/Sandisk SSD ZIL

Dan McDonald danmcd at omniti.com
Wed Feb 19 02:51:18 UTC 2014

- Previous message: [OmniOS-discuss] Pliant/Sandisk SSD ZIL
- Next message: [OmniOS-discuss] Pliant/Sandisk SSD ZIL
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

    On Feb 18, 2014, at 9:41 PM, Marion Hakanson <hakansom at ohsu.edu> wrote:

    > Derek Yarnell wrote:
    >>>> So we bought a new Dell R720xd with 2 Dell SLC SSDs which were shipped
    >>>> as a Pliant-LB206S-D323-186.31GB via format.
    >
    > Richard Elling wrote:
    >>> Pliant SSDs (note: Pliant was purchased by Sandisk in 2011) are optimized
    > for
    >>> lots of concurrent I/O operations. This is not the kind of workload
    > generated
    >>> by the ZIL, which is more contiguous, single thread-like.
    >
    > Derek Yarnell wrote:
    >> I realize that they may not be as good as Stec/HGST ZeusRAM drives for
    >> the slog.  I still can't wrap my head around that it is as bad as having
    >> no discrete slog.
    >
    > Hi Derek,
    >
    > No better than with the ZIL running on the pool's HDD's?  Really?
    >
    > Out of curiosity, what HBA is being used for these drives (and slog)
    > in this R720xd, H710 or H310?  Something else?
    >
    > I'm also looking at the R720xd here, though I was thinking of using the
    > Intel DC S3700 SSD for a log device (in one of the internal flex-bay's),
    > with the pool drives being of the 2.5" form-factor.

    The H710 sticks you with HW-RAID.  Ick.

    The H310 allows you to use raw SAS disks, BUT I've encountered problems with BIOS failing INT13 reads on H310 raw disks, which makes booting difficult.  (Also some Dell-issued disks require power entries in /kernel/drv/sd.conf.)

    Just be cautious when using the Dell HBAs.

    Dan

- Previous message: [OmniOS-discuss] Pliant/Sandisk SSD ZIL
- Next message: [OmniOS-discuss] Pliant/Sandisk SSD ZIL
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

More information about the OmniOS-discuss mailing list