similar to: Best way to measure performance of ZIL

Hello list, someone (actually neil perrin (CC)) mentioned in this thread: http://mail.opensolaris.org/pipermail/zfs-discuss/2009-December/034340.html that is should be possible to import a pool with failed log devices (with or without data loss ?). >/ />/ Has the following error no consequences? />/ />/ Bug ID 6538021 />/ Synopsis Need a way to force pool startup when

I recently got a new SSD (ocz vertex LE 50gb) It seems to work really well as a ZIL performance wise. My question is, how safe is it? I know it doesn''t have a supercap so lets'' say dataloss occurs....is it just dataloss or is it pool loss? also, does the fact that i have a UPS matter? the numbers i''m seeing are really nice....these are some nfs tar times before

I need some clarification on the FOID handed to zil_commit. I wrote a dscript to watch entry and return of zil_commit_writer. Here is an example output: <pre> 2009 Jan 23 23:34:36: ZIL Commit : Seq 183211310 : FOID 129644 Completed in 0 ms 2009 Jan 23 23:34:36: ZIL Commit : Seq 183211324 : FOID 129644 Completed in 0 ms 2009 Jan 23 23:34:36: ZIL Commit : Seq 183211386

I have three zpools on a server and want to add a mirrored pair of ssd''s for the ZIL. Can the same pair of SSDs be used for the ZIL of all three zpools or is it one ZIL SLOG device per zpool? -- This message posted from opensolaris.org

Hi folks, I would appreciate it if someone can help me understand some weird results I''m seeing with trying to do performance testing with an SSD offloaded ZIL. I''m attempting to improve my infrastructure''s burstable write capacity (ZFS based WebDav servers), and naturally I''m looking at implementing SSD based ZIL devices. I have a test machine with the

Are there any drawbacks to partition a SSD in two parts and use L2ARC on one partition, and ZIL on the other? Any thoughts? -- This message posted from opensolaris.org

I posted a thread on this once long ago[1] -- but we''re still fighting with this problem and I wanted to throw it out here again. All of our hardware is from Silicon Mechanics (SuperMicro chassis and motherboards). Up until now, all of the hardware has had a single 24-disk expander / backplane -- but we recently got one of the new SC847-based models with 24 disks up front and 12 in the

Is it true that Solaris 10 u4 does not have any of the nice ZIL controls that exist in the various recent Open Solaris flavors? I would like to move my ZIL to solid state storage, but I fear I can''t do it until I have another update. Heck, I would be happy to just be able to turn the ZIL off to see how my NFS on ZFS performance is effected before spending the $''s. Anyone

Hi all, I have a home server based on SNV_127 with 8 disks; 2 x 500GB mirrored root pool 6 x 1TB raidz2 data pool This server performs a few functions; NFS : for several ''lab'' ESX virtual machines NFS : mythtv storage (videos, music, recordings etc) Samba : for home directories for all networked PCs I backup the important data to external USB hdd each day. I previously had

We are looking into the possibility of adding a dedicated ZIL and/or L2ARC devices to our pool. We are looking into getting 4 ? 32GB Intel X25-E SSD drives. Would this be a good solution to slow write speeds? We are currently sharing out different slices of the pool to windows servers using comstar and fibrechannel. We are currently getting around 300MB/sec performance with 70-100% disk busy.

Hi, as I have learned from the discussion about which SSD to use as ZIL drives, I stumbled across this article, that discusses short stroking for increasing IOPs on SAS and SATA drives: http://www.tomshardware.com/reviews/short-stroking-hdd,2157.html Now, I am wondering if using a mirror of such 15k SAS drives would be a good-enough fit for a ZIL on a zpool that is mainly used for file

Recently, I''ve been reading through the ZIL/slog discussion and have the impression that a lot of folks here are (like me) interested in getting a viable solution for a cheap, fast and reliable ZIL device. I think I can provide such a solution for about $200, but it involves a lot of development work. The basic idea: the main problem when using a HDD as a ZIL device are the cache flushes

Anyone made some performance comparison between XFS and ZFS with ZIL on SSD, in gluster environment ? I've tried to compare both on another SDS (LizardFS) and I haven't seen any tangible performance improvement. Is gluster different ?

Are any of you using the Intel 320 as ZIL? It''s MLC based, but I understand its wear and performance characteristics can be bumped up significantly by increasing the overprovisioning to 20% (dropping usable capacity to 80%). Anyone have experience with this? Ray

On Tue, Oct 10, 2017, at 11:19 AM, Gandalf Corvotempesta wrote: > Anyone made some performance comparison between XFS and ZFS with ZIL > on SSD, in gluster environment ? > > I've tried to compare both on another SDS (LizardFS) and I haven't > seen any tangible performance improvement. > > Is gluster different ? Probably not. If there is, it would probably favor

Hello, first time posting. I''ve been working with zfs on and off with limited *nix experience for a year or so now, and have read a lot of things by a lot of you I''m sure. Still tons I don''t understand/know I''m sure. We''ve been having awful IO latencies on our 7210 running about 40 VM''s spread over 3 hosts, no SSD''s / Intent Logs.

I've had good results with using SSD as LVM cache for gluster bricks ( http://man7.org/linux/man-pages/man7/lvmcache.7.html). I still use XFS on bricks. On Tue, Oct 10, 2017 at 12:27 PM, Jeff Darcy <jeff at pl.atyp.us> wrote: > On Tue, Oct 10, 2017, at 11:19 AM, Gandalf Corvotempesta wrote: > > Anyone made some performance comparison between XFS and ZFS with ZIL > > on

Hi forks: I've been testing SMB2 with samba 3.6.4 performance these days, and I find a weird benchmark that SMB2 write performance is slower than SMB1 in 10Gb ethernet network. Server ----------------------- Linux: Redhat Enterprise 6.1 x64 Kernel: 2.6.31 x86_64 Samba: 3.6.4 (almost using the default configuration) Network: Chelsio T4 T420-SO-CR 10GbE network adapter RAID: Adaptec 51645 RAID

I have a 24 x 1TB system being used as an NFS file server. Seagate SAS disks connected via an LSI 9211-8i SAS controller, disk layout 2 x 11 disk RAIDZ2 + 2 spares. I am using 2 x DDR Drive X1s as the ZIL. When we write anything to it, the writes are always very bursty like this: ool 488K 20.0T 0 0 0 0 xpool 488K 20.0T 0 0 0 0 xpool

I have some questions about the choice of SSDs to use for ZIL and L2ARC. I''m trying to build an OpenSolaris iSCSI SAN out of a whitebox system, which is intended to be used as a backup SAN during storage migration, so it''s built on a tight budget. The system currently has 4GB RAM, 3GHz Core2-Quad and 8x 500GB WD REII SATA HDDs attached to an Areca 8port ARC-1220 controller