Date: Thu, 7 Jun 2018 18:18:17 +0300 From: Christos Chatzaras <chris@cretaforce.gr> To: FreeBSD <freebsd-questions@freebsd.org> Subject: Re: Toshiba disk low performance Message-ID: <C44EC16F-E0DA-4CDD-A180-6ECEA1436F74@cretaforce.gr> In-Reply-To: <DC4343C3-AC15-427E-9653-4C6A7F4E34C4@cretaforce.gr> References: <DC4343C3-AC15-427E-9653-4C6A7F4E34C4@cretaforce.gr>
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During a 10GB mysql import the server with Toshiba disks does 250-400 = ops/s and another server with exactly the same setup (only disks = different) does 1000-2300 ops/s. When servers are idle "diskinfo -ctv /dev/ada0" show similar speeds to = both disks. During the mysql import the server with Toshiba disks show = 15 times worst results. > On 7 Jun 2018, at 18:02, Christos Chatzaras <chris@cretaforce.gr> = wrote: >=20 > I order a new dedicated server from a provider. The server has 2 = Toshiba disks and the disk peformance is very slow. >=20 > I test it using mysqlcheck -Ao which optimizes the databases and also = with 10GB mysql import at 2 servers - one with the Toshiba disks and the = other with Seagate disks. >=20 > During the tests gstat for the server with Toshiba disks show 3-4 = times lower disk operations / second compared to the other server. >=20 > I had the same problem (same Toshiba models) in a production server (I = notice it after I put it in production) and ask the datacenter to = replace one disk with different model, I rebuild RAID-1, then replace = the second disk and I rebuild the RAID-1. And the issue resolved. >=20 > It shows these disks as UDMA5 but other disks with good speed show = UDMA6. Also Linux shows these disks as UDMA5. >=20 > Here is the dmesg output: >=20 > ---- > ada0 at ahcich1 bus 0 scbus0 target 0 lun 0 > ada0: <TOSHIBA MG04ACA400E FP3B> ATA8-ACS SATA 3.x device > ada0: Serial Number Z5B7K1Q4FJKA > ada0: 600.000MB/s transfers (SATA 3.x, UDMA5, PIO 8192bytes) > ada0: Command Queueing enabled > ada0: 3815447MB (7814037168 512 byte sectors) > ada1 at ahcich2 bus 0 scbus1 target 0 lun 0 > ada1: <TOSHIBA MG04ACA400E FP3B> ATA8-ACS SATA 3.x device > ada1: Serial Number Z5B7K1Q5FJKA > ada1: 600.000MB/s transfers (SATA 3.x, UDMA5, PIO 8192bytes) > ada1: Command Queueing enabled > ada1: 3815447MB (7814037168 512 byte sectors) > ---- >=20 > What could be the problem with the Toshiba disks? > _______________________________________________ > freebsd-questions@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to = "freebsd-questions-unsubscribe@freebsd.org"
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